Excerpt from Compositae Newsletter, Vol. 22
Embryology of the monotypic genus Dymondia Compton, one species of Cullumia R. Br., one species of Didelta L'Herit., and two species of Heterolepis Cass. was studied. Except for the species of Heterolepis with bisporic embryo sacs the investigation shows the usual Polygonum type of embryo sac development in the genera Dymondia, Cullumia and Didelta. The microspores of Dymondia margaretae Compton form tetrahedral tetrads and the tapetum develops into a periplasmodium. The deviating embryology in Heterolepis strengthens the suspicion that this genus is incorrectly placed in Arctotideae-Gorteriinae.
The investigated material was collected by the author in southern South Africa in September 1982 as follows:
Dymondia margaretae Compton in Kirstenbosch Botanic Garden, Cape Town.
Cullumia squarrosa (L.) R. Br. at a roadside not far from Cape Point.
Didelta carnosa (L.f.) Ait. on the beach of Blouberg, Cape Town.
Heterolepis aliena (L.f.) Druce in Karroo Botanic Garden, Worcester.
Heterolepis peduncularis DC. at the airfield of Worcester.
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