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The comparative morphology of the Icacinaceae, VI. The Pollen

1952; Arnold Arboretum of Harvard University; Volume: 33; Issue: 3 Linguagem: Inglês

10.5962/p.333940

2474-3283

A Orville Dahl,

Plant Diversity and Evolution

With nine plates THE ICACINACEAE Miers is a dicotyledonous family made up of approximately 60 genera embracing, according to Sleumer (30), about 300 species largely confined to the tropics of both the old and new worlds.Most of the species are woody.The affinities of this family, as well as the specific and generic concepts within the group, have been variously interpreted.Engler (7) placed the family in the suborder /cacinineae following the suborder Celastrineae in the order Sapindales while Wettstein (31) and Hutchinson (24) included the /cacinaceae in the order Celastrales.Hallier (13) interpreted the family as having affinities with the Olacaceae and included it in the order Santalales.Recently, Howard (16-23) has discussed the systematic position of the family.The Jcacinaceae have been the subject of intensive anatomical, morphological, and taxonomic investigations initiated by I. W. Bailey and R. A. Howard in 1941 (1).These studies have provided a critical basis for the interpretation of old as well as recent researches in the family.In the latter category is the present study of pollen grain morphology of the Icacinaceae.Studies of comparative pollen morphology have been mentioned, not infrequently, as being capable of yielding a distinctive set of systematics and phylogeny.However, it seems regrettable that detailed, comparative pollen studies of genera or families are rare in either the contemporary or older literature.Citations to extant studies will be found in Wodehouse (32) and Erdtman (8,10).When considered along with data derived from other techniques, i.e. data concerning other plant parts, the information concerning pollen grain form is a definite aid in arriving at a more natural arrangement of species.This study of pollen in the Icacinaceae was pursued from this point of view.