FLORA OF VIETNAM

N. Tanaka note: P. vietnamicum is described as differing from P. kingianum in the charactersof filaments and the degree of constriction in the mouth of the perianth tube, but the difference appears small, hence it is included here in P. kingianum which looks highly variable. To study the difference in filaments, we need to examine the longitudinal section of the flowers. My identifications are thus not so critical at present.