Millettia sirindhorniana and M. tomentosa, two new species of Millettia (Fabaceae: Millettieae) for Thailand

Abstract

Two new species of the genus Millettia, M. sirindhorniana and M. tomentosa, are herein described and illustrated. Millettia sirindhorniana shares morphological characteristics with M. extensa and M. fruticosa in being a woody climber with the same leaflet shape and inflorescence type. However, it differs from those species by the presence of stipels and basal callosities, and its shallowly crenate floral disk. Millettia tomentosa is similar to M. extensa and M. suddeei, but differs from the first species by having a brachyblast bearing ca 10 flowers, the standard with basal callosities, presence of a tubular floral disk and oblong to slightly obovate fruits; and it differs from the latter by the absence of stipels, the standard with swollen basal callosities, monadelphous stamens and the tubular floral disc. Descriptions, illustrations, colour plates, vernacular names, etymology, conservation status and key diagnostic characteristics are provided.