FLORA OF VIETNAM

N. Tanaka note: P. vietnamicum is described as differingfrom 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 highlyvariable. To study the difference in filaments, we need to examine thelongitudinal section of the flowers. My identifications are thus not socritical at present.