Pollen Morphology of the Tribe Triclisieae of the Menispermaceae in Relation to Its Taxonomy

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Abstract
The pollen morphology of 18 genera and 48 species of the Tribe Triclisieae (Menispermaceae) have been studied. In general the pollen is very small, rather simple with a reticulate tectum. Three main types have been recognized, inaperturate, tricolpate and tricolporate. The inaperturate type has only been found in the genus Tiliacora. The other two types occur more or less equally among the rest of the genera. Shape, length of colpi, size of reticulum and ornamentation of the muri provide pollen characters to further subdivide the tribe. These pollen types and subtypes are related to the genera, subgenera or sections recognized in the tribe and are generally found to support the existing classification. Although found to be of considerable taxonomic significance pollen morphology shows no single linear trend in the systematic relationships of the tribe as a whole.

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