Pollen morphology and biometry of the genus <i>Androcymbium</i> (Colchicaceae) in southern Africa: taxonomic and biogeographic considerations
Pollen characters in 16 southern African type specimens of Androcymbium Willd. that represent the three sections into which the genus is presently divided (Androcymbium, Dregeocymbium and Erythrostictus), were examined to assess the possibility of sectional characterization based on pollen traits...
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| Format: | Article |
| Language: | English |
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South African National Biodiversity Institut
2002-09-01
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| Series: | Bothalia: African Biodiversity & Conservation |
| Subjects: | |
| Online Access: | https://abcjournal.org/index.php/abc/article/view/471 |
| _version_ | 1818385256444592128 |
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| author | N. Membrives J. Martín J. Caujapé-Castells J Pedrola-Monfort |
| author_facet | N. Membrives J. Martín J. Caujapé-Castells J Pedrola-Monfort |
| author_sort | N. Membrives |
| collection | DOAJ |
| description | Pollen characters in 16 southern African type specimens of Androcymbium Willd. that represent the three sections into which the genus is presently divided (Androcymbium, Dregeocymbium and Erythrostictus), were examined to assess the possibility of sectional characterization based on pollen traits and to explore the relationship between pollen traits and geographic species distribution. Differences in pollen grain size, shape, number of apertures and exine pattern, were observed. Principal Component Analysis, using both qualitative and biometric pollen characters, distinguished four groups of species with four different pollen types. Most of the species have a microreticulate exine pattern with either diaperturate or tria- perturate grains. The remaining species have either a rugulate exine pattern with diaperturate grains, or a rugulate-reticu- late exine pattern with thickened (hypertrophied) muri with diaperturate grains. While section Dregeocymbium can be well delimited by the unique thickened muri. and by a significantly larger grain size, no diagnostic pollen traits were found for sections Androcymbium and Erythrostictus. Similarly, although the six northern African species exhibit a microreticulate exine pattern, the high variability observed for this trait in their southern African counterparts, does not follow a geographic pattern. |
| first_indexed | 2024-12-14T03:35:16Z |
| format | Article |
| id | doaj.art-7f8f660d9141463f9bbb80e47e61c384 |
| institution | Directory Open Access Journal |
| issn | 0006-8241 2311-9284 |
| language | English |
| last_indexed | 2024-12-14T03:35:16Z |
| publishDate | 2002-09-01 |
| publisher | South African National Biodiversity Institut |
| record_format | Article |
| series | Bothalia: African Biodiversity & Conservation |
| spelling | doaj.art-7f8f660d9141463f9bbb80e47e61c3842022-12-21T23:18:38ZengSouth African National Biodiversity InstitutBothalia: African Biodiversity & Conservation0006-82412311-92842002-09-01321919610.4102/abc.v32i1.471403Pollen morphology and biometry of the genus <i>Androcymbium</i> (Colchicaceae) in southern Africa: taxonomic and biogeographic considerationsN. Membrives0J. Martín1J. Caujapé-Castells2J Pedrola-Monfort3Jardi Botanic de Barcelona.Laboratori de Botánica. Facultad de Farmacia. Universitat de BarcelonaJardín Botánico Canario Viera y Clavijo.Estació International de Biologia Mediterrania-Jardi Botanic ManmurtraPollen characters in 16 southern African type specimens of Androcymbium Willd. that represent the three sections into which the genus is presently divided (Androcymbium, Dregeocymbium and Erythrostictus), were examined to assess the possibility of sectional characterization based on pollen traits and to explore the relationship between pollen traits and geographic species distribution. Differences in pollen grain size, shape, number of apertures and exine pattern, were observed. Principal Component Analysis, using both qualitative and biometric pollen characters, distinguished four groups of species with four different pollen types. Most of the species have a microreticulate exine pattern with either diaperturate or tria- perturate grains. The remaining species have either a rugulate exine pattern with diaperturate grains, or a rugulate-reticu- late exine pattern with thickened (hypertrophied) muri with diaperturate grains. While section Dregeocymbium can be well delimited by the unique thickened muri. and by a significantly larger grain size, no diagnostic pollen traits were found for sections Androcymbium and Erythrostictus. Similarly, although the six northern African species exhibit a microreticulate exine pattern, the high variability observed for this trait in their southern African counterparts, does not follow a geographic pattern.https://abcjournal.org/index.php/abc/article/view/471<i>Androcymbium</i> Willd.. biogeographyColchicaceaepollen biometrypollen morphologysouthern Africataxonomy |
| spellingShingle | N. Membrives J. Martín J. Caujapé-Castells J Pedrola-Monfort Pollen morphology and biometry of the genus <i>Androcymbium</i> (Colchicaceae) in southern Africa: taxonomic and biogeographic considerations Bothalia: African Biodiversity & Conservation <i>Androcymbium</i> Willd.. biogeography Colchicaceae pollen biometry pollen morphology southern Africa taxonomy |
| title | Pollen morphology and biometry of the genus <i>Androcymbium</i> (Colchicaceae) in southern Africa: taxonomic and biogeographic considerations |
| title_full | Pollen morphology and biometry of the genus <i>Androcymbium</i> (Colchicaceae) in southern Africa: taxonomic and biogeographic considerations |
| title_fullStr | Pollen morphology and biometry of the genus <i>Androcymbium</i> (Colchicaceae) in southern Africa: taxonomic and biogeographic considerations |
| title_full_unstemmed | Pollen morphology and biometry of the genus <i>Androcymbium</i> (Colchicaceae) in southern Africa: taxonomic and biogeographic considerations |
| title_short | Pollen morphology and biometry of the genus <i>Androcymbium</i> (Colchicaceae) in southern Africa: taxonomic and biogeographic considerations |
| title_sort | pollen morphology and biometry of the genus i androcymbium i colchicaceae in southern africa taxonomic and biogeographic considerations |
| topic | <i>Androcymbium</i> Willd.. biogeography Colchicaceae pollen biometry pollen morphology southern Africa taxonomy |
| url | https://abcjournal.org/index.php/abc/article/view/471 |
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