Starchy and Starchless Pollen in the Onagraceae

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Abstract
Mature pollen from 76 spp. in the complete roster of genera in the Onagraceae was examined for starch-containing or starchless contents. Fuchsia and Lopezia pollen grains, after passing through a stage of starch accumulation, lose the starch (presumably converted to lipid) and are classified as starchless. All other genera have pollen that is starch-containing at maturity. The phylogenetic implications of this are considered. Pollen grain diameter is larger in the starchy taxa than in the starchless ones. There is a strong correlation of pollen grain diameter and the length of style to be traversed by the pollen tube in species with starchy grains.

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