Pollen morphology of the genus Cornukaempferia (Zingiberaceae) in Thailand

Cornukaempferia is a recently described genus of Zingiberaceae which only occurs in Thailand as a rare genus with limited geographical distribution.Only three species have been described so far,including a recently described new species,C.larsenii.These three species are morphologically very similar and additional data on other biological aspects are useful for the elucidation of their relationship.Pollen morphology of all three species of genus Cornukaempferia has been studied by light microscopy and scanning electron microscopy.The pollen grains are monad,spherical,inaperturate.The exine sculpture is echinate with psilate between the spines for C.aurantiflora and C.longipetiolata,or echinate with regulate between the spines for C.larsenii.This obser-vation helps support the taxonomic status of C.larsenii.