Pollen morphology of the genus Lasianthus (Rubiaceae) and related taxa from Asia Chemical constituents from root of Lasianthus acuminatissimus New records of plants of Lasianthus Jack (Rubiaceae) from Hainan Province, South China. A taxonomic revision of the genus Lasianthus Jack. (Rubiaceae) from Thailand New Plants of the Genus Lasianthus (Rubiaceae) From Vietnam Notes on the Genus Lasianthus Jack (Raubiaceae) from Asia A Taxonomic Study on the Genus Lasianthus Jack in China MATERIALS FOR CHINESE RUBIACEAE (Ⅲ ) A new subspecies of the genus Lasianthus Jack (Rubiaceae) from Yunnan with reference to its biogeographical implication