Plant Systematics and Evolution

, Volume 159, Issue 1–2, pp 81–83 | Cite as

Distyly and incompatibility inVillarsia congestiflora (Menyanthaceae), with comparative remarks onV. capitata

  • Robert Ornduff


The Western Australian annual of restricted distribution,Villarsia congestiflora, has distylous flowers and pollen-size heteromorphism. Results of a crossing program indicate that this species is strongly self-incompatible, that crosses among individuals of the same morph produce little or no seed, and that intermorph crosses produce copious seed. The species shares a number of morphological and ecological traits withV. capitata, another distylous, self-incompatible annual species of Western Australia with a greater area of distribution. Artificial hybrids between the two, however, showed reduced pollen stainability. Both species combine a number of specialized morphological features with a breeding system that is primitive for the familyMenyanthaceae.

Key words

Angiosperms Menyanthaceae Villarsia Distyly incompatibility seed set 


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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Robert Ornduff
    • 1
  1. 1.Department of BotanyUniversity of CaliforniaBerkeleyUSA

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