Pollen Dimorphism in the Rubiaceae
Автор антэкологических публикаций
, 1956. V. 10. No. 1. P. 23–31 (9).
Журнал с антэкологическими публикациями.
The evolution of dimorphism in the pollen and stigmata of members of the Plumbaginaceae has been followed by a return, in some cases, to monomorphism. This has provided an extremely useful tool for the elucidation of genetical, genecological, phytogeographical and evolutionary problems. In the search for a comparable situation in other families, the neglected and ambiguous account of pollen dimorphism in 'Faramea' described by Fritz Müller and accepted by Charles Darwin has been reinvestigated. Examination of the pollen of genuine Faramea, the tracing of Müller's herbarium material and the study of new collections has shown that Rudgea jasminoides (Cham.) Muell.-Arg. (Rubiaceae) is the species involved and that pollen dimorphism associated with heterostyly has evolved in the Rubiaceae in a manner quite comparable with that in the Plumbaginaceae. The difference between the two pollen forms of a single species of Rudgea is as great as that which distinguishes some genera or higher taxa yet it may have a simple genetical basis. Occurring as it does in a genus of woody tropical plants (and possibly being present in related genera with a similar habit), this dimorphism may be an important aid to the study of the history and distribution of tropical forest floras, of which there is little fossil record.