FLORAL ENANTIOMORPHY AND THE REPRODUCTIVE SYSTEM OF WACHENDORFIA PANICULATA (HAEMODORACEAE)

Authors


SUMMARY

Flowers of the South African genus Wachendorfia (Haemodoraceae) are dimorphic. Some individuals in a population produce flowers in which the style and one stamen are deflected to the right and the other two stamens are deflected to the left; other individuals produce flowers with the reverse arrangement of style and stamens. Articifical pollinations of W. paniculata indicate that it has a weakly developed self-incompatibility system; intermorph crosses produced more seeds than self-pollinations or intramorph pollinations. Features of the floral morphology of W. paniculata suggest that it is pollinated by a large-bodied insect, possibly Xylocopa. The dimorphism in the position of anthers and stigmas probably increases the level of intermorph pollination. The low sugar concentration of the nectar, low pollen production per flower, and few flowers per plant also probably result in pollinators visiting more than one plant during their foraging activities, thus reinforcing the floral dimorphism and increasing the opportunities for intermorph pollination.

Ancillary