Pollen Morphology of Pillansia L. Bolus (Iridaceae)

Abstract
The monotypic southwestern Cape genus Pillansia is a taxonomically isolated member of Iridaceae subfamily Ixioideae. It shares some synapomorphies with Ixioideae, although it differs in its unspecialized leaf anatomy and inflorescence structure, a panicle rather than a spike. The pollen is typical of Ixioideae in having a micropunctate exine with minute supratectal papillae. Exine of most other genera and subfamilies of Iridaceae is reticulate. Membership of Pillansia in Ixioideae is thus supported by pollen morphology. Micropunctate exine must be regarded as the basic condition for the subfamily and an additional feature separating Ixioideae from other Iridaceae.

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