The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species
Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To...
Ausführliche Beschreibung
Autor*in: |
Jakoet, A. [verfasserIn] |
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Format: |
E-Artikel |
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Sprache: |
Englisch |
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2019transfer abstract |
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Umfang: |
12 |
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Übergeordnetes Werk: |
Enthalten in: Characterization of knowledge-based volumetric modulated arc therapy plans created by three different institutions’ models for prostate cancer - Ueda, Yoshihiro ELSEVIER, 2020, an international interdisciplinary journal for botanical sciences : official journal of the South African Association of Botanists, Amsterdam |
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Übergeordnetes Werk: |
volume:121 ; year:2019 ; pages:282-293 ; extent:12 |
Links: |
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DOI / URN: |
10.1016/j.sajb.2018.11.016 |
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ELV046705635 |
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245 | 1 | 4 | |a The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species |
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520 | |a Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. | ||
520 | |a Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. | ||
700 | 1 | |a Mucina, L. |4 oth | |
700 | 1 | |a Magee, A.R. |4 oth | |
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10.1016/j.sajb.2018.11.016 doi GBV00000000000616.pica (DE-627)ELV046705635 (ELSEVIER)S0254-6299(18)31302-4 DE-627 ger DE-627 rakwb eng 610 VZ 44.64 bkl 44.81 bkl Jakoet, A. verfasserin aut The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species 2019transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. Mucina, L. oth Magee, A.R. oth Enthalten in Elsevier Ueda, Yoshihiro ELSEVIER Characterization of knowledge-based volumetric modulated arc therapy plans created by three different institutions’ models for prostate cancer 2020 an international interdisciplinary journal for botanical sciences : official journal of the South African Association of Botanists Amsterdam (DE-627)ELV005259444 volume:121 year:2019 pages:282-293 extent:12 https://doi.org/10.1016/j.sajb.2018.11.016 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.64 Radiologie VZ 44.81 Onkologie VZ AR 121 2019 282-293 12 |
spelling |
10.1016/j.sajb.2018.11.016 doi GBV00000000000616.pica (DE-627)ELV046705635 (ELSEVIER)S0254-6299(18)31302-4 DE-627 ger DE-627 rakwb eng 610 VZ 44.64 bkl 44.81 bkl Jakoet, A. verfasserin aut The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species 2019transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. Mucina, L. oth Magee, A.R. oth Enthalten in Elsevier Ueda, Yoshihiro ELSEVIER Characterization of knowledge-based volumetric modulated arc therapy plans created by three different institutions’ models for prostate cancer 2020 an international interdisciplinary journal for botanical sciences : official journal of the South African Association of Botanists Amsterdam (DE-627)ELV005259444 volume:121 year:2019 pages:282-293 extent:12 https://doi.org/10.1016/j.sajb.2018.11.016 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.64 Radiologie VZ 44.81 Onkologie VZ AR 121 2019 282-293 12 |
allfields_unstemmed |
10.1016/j.sajb.2018.11.016 doi GBV00000000000616.pica (DE-627)ELV046705635 (ELSEVIER)S0254-6299(18)31302-4 DE-627 ger DE-627 rakwb eng 610 VZ 44.64 bkl 44.81 bkl Jakoet, A. verfasserin aut The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species 2019transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. Mucina, L. oth Magee, A.R. oth Enthalten in Elsevier Ueda, Yoshihiro ELSEVIER Characterization of knowledge-based volumetric modulated arc therapy plans created by three different institutions’ models for prostate cancer 2020 an international interdisciplinary journal for botanical sciences : official journal of the South African Association of Botanists Amsterdam (DE-627)ELV005259444 volume:121 year:2019 pages:282-293 extent:12 https://doi.org/10.1016/j.sajb.2018.11.016 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.64 Radiologie VZ 44.81 Onkologie VZ AR 121 2019 282-293 12 |
allfieldsGer |
10.1016/j.sajb.2018.11.016 doi GBV00000000000616.pica (DE-627)ELV046705635 (ELSEVIER)S0254-6299(18)31302-4 DE-627 ger DE-627 rakwb eng 610 VZ 44.64 bkl 44.81 bkl Jakoet, A. verfasserin aut The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species 2019transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. Mucina, L. oth Magee, A.R. oth Enthalten in Elsevier Ueda, Yoshihiro ELSEVIER Characterization of knowledge-based volumetric modulated arc therapy plans created by three different institutions’ models for prostate cancer 2020 an international interdisciplinary journal for botanical sciences : official journal of the South African Association of Botanists Amsterdam (DE-627)ELV005259444 volume:121 year:2019 pages:282-293 extent:12 https://doi.org/10.1016/j.sajb.2018.11.016 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.64 Radiologie VZ 44.81 Onkologie VZ AR 121 2019 282-293 12 |
allfieldsSound |
10.1016/j.sajb.2018.11.016 doi GBV00000000000616.pica (DE-627)ELV046705635 (ELSEVIER)S0254-6299(18)31302-4 DE-627 ger DE-627 rakwb eng 610 VZ 44.64 bkl 44.81 bkl Jakoet, A. verfasserin aut The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species 2019transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. Mucina, L. oth Magee, A.R. oth Enthalten in Elsevier Ueda, Yoshihiro ELSEVIER Characterization of knowledge-based volumetric modulated arc therapy plans created by three different institutions’ models for prostate cancer 2020 an international interdisciplinary journal for botanical sciences : official journal of the South African Association of Botanists Amsterdam (DE-627)ELV005259444 volume:121 year:2019 pages:282-293 extent:12 https://doi.org/10.1016/j.sajb.2018.11.016 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.64 Radiologie VZ 44.81 Onkologie VZ AR 121 2019 282-293 12 |
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The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species |
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The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species |
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pseudo-radiate buttons: a taxonomic revision of the <ce:italic>cotula turbinata</ce:italic> group (asteraceae; anthemideae) and the description of two new species |
title_auth |
The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species |
abstract |
Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. |
abstractGer |
Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. |
abstract_unstemmed |
Cotula is a large genus of ca. 50 species, centred in the Cape Floristic Region of South Africa, but also extending into tropical Africa, Eurasia, Australia as well as the Americas. The urgent need for a taxonomic treatment of Cotula has long been acknowledged, with no formal revision available. To this end, a taxonomic revision of the Cotula turbinata group is presented here. Several of the species in this group have previously been treated under the segregate genus Cenia, which included both radiate and disciform species with apically swollen peduncles. The species within the C. turbinata group are however not truly radiate, but rather pseudo-radiate due to modified outer disc florets with a greatly enlarged dorsal lobe. These modified disc florets, or pseudo-rays, are unique to the C. turbinata group and to our knowledge within the tribe. At the beginning of this study three species were recognized, all occurring in the Greater Cape Floristic Region. Extensive herbarium and field studies have revealed the presence of an additional three species, two described here as new (Cotula calcicola Jakoet, Mucina & Magee and Cotula perennans Jakoet, Mucina & Magee) and a third re-instated from the synonymy, Cotula pruinosa (E.Mey. ex. DC.) Jakoet & Magee. As such we here recognize six species, distinguished by their life history, leaf dissection, floret lobe color and size, and cypsela morphology. |
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The pseudo-radiate buttons: A taxonomic revision of the <ce:italic>Cotula turbinata</ce:italic> group (Asteraceae; Anthemideae) and the description of two new species |
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