An SEM study of pollen morphology inMoslaand the representative species of the allied genera,Collinsonia, Elsholtzia, Keiskea, Perilla, andPerillula, reveals that the pollen surface sculpture ofMosla(exceptM. cavaleriei) andPerillahas discontinuous ridges, while that of the other genera has the suprareticulate ornamentation. The nutlet surface ornamentation ofMoslaandPerillais also unique. Both pollen and nutlet morphology suggest thatMoslaandPerillaare the most closely related and highly specialized among these genera. The SEM examination of pollen and nutlet ofMoslaprovides no support to the sectional subdivision in this genus.
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