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Tricarpelema
''Tricarpelema'' is a genus of monocotyledonous flowering plants in the dayflower family consisting of 8 species. The genus is divided into two subgenera, subgenus ''Tricarpelema'', which includes 7 known species found in tropical Asia, and subgenus ''Keatingia'' with one species in western Africa. The Asian species are typically found in the forest understory while the single African species has evolved to drier, sunnier conditions and is usually associated with inselbergs.〔(Kew World Checklist of Selected Plant Families )〕
==Taxonomy==
The genus ''Tricarpelema'' was created in 1966 by Kevin Cousins when he found that a Himalayan species then known as ''Aneilema thomsonii'' could not be satisfactorily classified within ''Aneilema'' nor the related genus ''Dictyospermum''. He placed this species in the new genus as ''Tricarpelema giganteum''.〔 D.Y. Hong added two species to the new genus, namely ''T. chinense'' and ''T. xizangenese'', in 1974 and 1981 respectively.〔 Meanwhile, in a 1975 Ph.D. thesis, Robert Faden treated ''Tricarpelema'' as a subgenus of the closely related genus ''Dictyospermum'', while in 1980 R.S. Rao added another Indian species to the genus, namely ''T. glanduliferum''. By 1991 Faden had recognised the genus as distinct and added yet another species to it, this time ''T. philippense''. He and J. Cowley published a sixth species in 1996, ''T. pumilum'', which is endemic to Borneo. Two years later Faden recognised a seventh undescribed species from Vietnam and also commented on an African plant that could be an eighth species. In 2007 both of these were described with the Vietnamese species being named ''T. brevipedicellatum'' and the African species ''T. africanum''. As the African species differs from the Asian taxa in a number of important morphological features as well as in habitat, Faden assigned it to a new subgenus ''Keatingia''.〔
The taxonomic boundaries of some species are not completely understood, mainly due to a lack of herbarium specimens. For example, both ''T. brevipedicellatum'' and ''T. glanduliferum'' are each known from only two collections. A number of undescribed species are also likely to remain. For example, plants of ''T. philippense'' growing on Borneo are known to be larger than those in the Philippines, yet further differences have not been examined. Additionally, a single specimen collected from Burma shows characters that do not agree with any of the described species and likely represents a new species. Two more specimens, also from Burma, are distinct from the aforemetined specimen, but may represent a more southern distribution of the Chinese species. Robert Faden notes that further collections from Burma are necessary to better understand the genus in that country.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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