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    Towards a simplified taxonomy of Capsella bursa-pastoris (L.) Medik. (Brassicaceae)

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    Publication date
    1999
    Author
    Aksoy, A.
    Hale, William H.G.
    Dixon, Jean M.
    Keyword
    Taxonomy
    Capsella bursa-pastoris (L.) Medik.
    Brassicaceae
    Shepherd's Purse
    Morphological Variation
    Leaf Characters
    Capsule Characters
    Chromosome
    Rights
    © 1999 Botanical Society of the British Isles. Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    Yes
    
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    Abstract
    Capsella bursa-pastoris (L.) Medik. is a species with a cosmopolitan distribution which shows considerable morphological variation. Numerous authors have recognised widely differing numbers of varieties, microspecies or other infraspecific subdivisions (segregates) of this species. In an attempt to clarify this situation, we grew British material of the species under controlled conditions through to the F) generation to remove environmental variation, and assessed the plants on the basis of a range of morphological criteria, namely leaf shape, capsule size and also length of time taken to flower. Analysis of these characteristics consistently produced four basic groups, which had been previously described. Herbarium specimens could also nearly always be assigned to one of these groups. Limited chromosome counts suggest that two of these groups are diploid and two are tetraploid. We suggest this fourfold division into broad groups reflects the major genetic separations within the species, but that there is also considerable phenotypic plasticity shown by C. bursapastoris in response to factors such as shade or trampling. These four groups appear to differ in their geographic.al distribution in Britain. KEYWORDS: Shepherd's Purse, morphological variation, leaf characters, capsule characters, chromosome
    URI
    http://hdl.handle.net/10454/486
    Citation
    Aksoy A, Hale WHG and Dixon JM (1999) Towards a simplified taxonomy of Capsella bursa-pastoris (L.) Medik. (Brassicaceae). Watsonia. 22: 243-250.
    Type
    Article
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    Life Sciences Publications

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