Abstract
AbstractTrigonostemon,Dimorphocalyx,TritaxisandOstodesare tropical Asian genera that are very similar in morphology. The former three genera have been treated either as a single genusTrigonostemons.l. or as separate genera. A molecular phylogeny based on the nuclear ITS and chloroplasttrnKintron,trnT‐LandtrnL‐Fsequences reveals thatTrigonostemonis a monophyletic group, andDimorphocalyxandTritaxistogether form another monophyletic group separate fromTrigonostemon. Within the genusTrigonostemon, a strong correlation between the molecular phylogeny and pollen morphology was found. It demonstrates two potential evolutionary directions for the common “croton pattern” ornamentation of pollen in the genus: the subunits that form the “croton pattern” ornamentation tend to reduce to spines or they tend to merge in the later‐developed groups. The correlation between the molecular phylogeny and macromorphology ofTrigonostemonis discussed, and a new infrageneric classification with four sections is provided.Dimorphocalyxis reduced toTritaxis, the older generic name.
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