A new long-tubed subspecies of <i>Pelargonium dipetalum</i> (section <i>Hoarea</i>) (Geraniaceae) from the Albertinia-Swellendam area in Western Cape Province, South Africa
Background: Field studies confirmed that unusually long-tubed populations of Pelargonium dipetalum from between Swellendam and Albertinia, Western Cape Province, South Africa, are a distinct ecotype adapted to pollination by the long-proboscid fly, Prosoeca longipennis. The geographical and morpholo...
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doaj-a577fd270c4540079c16ce1afa57f6fd2020-11-25T03:39:22ZengSouth African National Biodiversity InstitutBothalia: African Biodiversity & Conservation0006-82412311-92842014-12-01441e1e810.4102/abc.v44i1.1631788A new long-tubed subspecies of <i>Pelargonium dipetalum</i> (section <i>Hoarea</i>) (Geraniaceae) from the Albertinia-Swellendam area in Western Cape Province, South AfricaM. Marianne le Roux0John C. Manning1National Herbarium, South African National Biodiversity Institute, South Africa; Department of Botany and Plant Biotechnology, University of Johannesburg, South AfricaCompton Herbarium, South African National Biodiversity Institute, South Africa; Research Centre for Plant Growth and Development, University of KwaZulu-Natal, South AfricaBackground: Field studies confirmed that unusually long-tubed populations of Pelargonium dipetalum from between Swellendam and Albertinia, Western Cape Province, South Africa, are a distinct ecotype adapted to pollination by the long-proboscid fly, Prosoeca longipennis. The geographical and morphological isolation of these populations suggests that they are reproductively isolated from short-tubed populations, which are pollinated by bees. Objectives: To determine and describe the floral variation in P. dipetalum, with a view to recognising the long-tubed populations at some taxonomic level. Method: All available collections were measured and compared. Results: Populations of P. dipetalum were segregated into a short-tubed form with hypanthium 3 mm – 24 mm long and mostly pink petals that occurs from Betty’s Bay to Knysna, and a long-tubed form with the hypanthium 34 mm – 54 mm long and consistently white petals that is restricted to a small area east of Swellendam between Suurbraak and Albertinia. We described the long-tubed form as the new subspecies P. dipetalum subsp. stenosiphon. Conclusion: The new subspecies increases our understanding of the diversity in P. dipetalum and represents a new taxon of conservation concern.https://abcjournal.org/index.php/abc/article/view/163EcotypeNew subspeciesPelargonium dipetalum L’Hér.PollinationSection Hoarea (Sweet) DC. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
M. Marianne le Roux John C. Manning |
spellingShingle |
M. Marianne le Roux John C. Manning A new long-tubed subspecies of <i>Pelargonium dipetalum</i> (section <i>Hoarea</i>) (Geraniaceae) from the Albertinia-Swellendam area in Western Cape Province, South Africa Bothalia: African Biodiversity & Conservation Ecotype New subspecies Pelargonium dipetalum L’Hér. Pollination Section Hoarea (Sweet) DC. |
author_facet |
M. Marianne le Roux John C. Manning |
author_sort |
M. Marianne le Roux |
title |
A new long-tubed subspecies of <i>Pelargonium dipetalum</i> (section <i>Hoarea</i>) (Geraniaceae) from the Albertinia-Swellendam area in Western Cape Province, South Africa |
title_short |
A new long-tubed subspecies of <i>Pelargonium dipetalum</i> (section <i>Hoarea</i>) (Geraniaceae) from the Albertinia-Swellendam area in Western Cape Province, South Africa |
title_full |
A new long-tubed subspecies of <i>Pelargonium dipetalum</i> (section <i>Hoarea</i>) (Geraniaceae) from the Albertinia-Swellendam area in Western Cape Province, South Africa |
title_fullStr |
A new long-tubed subspecies of <i>Pelargonium dipetalum</i> (section <i>Hoarea</i>) (Geraniaceae) from the Albertinia-Swellendam area in Western Cape Province, South Africa |
title_full_unstemmed |
A new long-tubed subspecies of <i>Pelargonium dipetalum</i> (section <i>Hoarea</i>) (Geraniaceae) from the Albertinia-Swellendam area in Western Cape Province, South Africa |
title_sort |
new long-tubed subspecies of <i>pelargonium dipetalum</i> (section <i>hoarea</i>) (geraniaceae) from the albertinia-swellendam area in western cape province, south africa |
publisher |
South African National Biodiversity Institut |
series |
Bothalia: African Biodiversity & Conservation |
issn |
0006-8241 2311-9284 |
publishDate |
2014-12-01 |
description |
Background: Field studies confirmed that unusually long-tubed populations of Pelargonium dipetalum from between Swellendam and Albertinia, Western Cape Province, South Africa, are a distinct ecotype adapted to pollination by the long-proboscid fly, Prosoeca longipennis. The geographical and morphological isolation of these populations suggests that they are reproductively isolated from short-tubed populations, which are pollinated by bees.
Objectives: To determine and describe the floral variation in P. dipetalum, with a view to recognising the long-tubed populations at some taxonomic level.
Method: All available collections were measured and compared.
Results: Populations of P. dipetalum were segregated into a short-tubed form with hypanthium 3 mm – 24 mm long and mostly pink petals that occurs from Betty’s Bay to Knysna, and a long-tubed form with the hypanthium 34 mm – 54 mm long and consistently white petals that is restricted to a small area east of Swellendam between Suurbraak and Albertinia. We described the long-tubed form as the new subspecies P. dipetalum subsp. stenosiphon.
Conclusion: The new subspecies increases our understanding of the diversity in P. dipetalum and represents a new taxon of conservation concern. |
topic |
Ecotype New subspecies Pelargonium dipetalum L’Hér. Pollination Section Hoarea (Sweet) DC. |
url |
https://abcjournal.org/index.php/abc/article/view/163 |
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