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Tuctoria
''Tuctoria'' is a genus of three species of grass in the family Poaceae. These are bunchgrass species that are found in vernal pools of central California and Baja California, Mexico. The plants are annuals that germinate under water in the spring and grow submerged for weeks. After the pools dry down, the grasses initiate a new set of foliage that lasts for one to two months until flowering and fruiting are complete.
==Taxonomy==
The genus was circumscribed by John R. Reeder in 1982. Along with ''Orcuttia'' and ''Neostapfia'', ''Tuctoria'' is one of three genera in the tribe Orcuttieae, previously outlined by Reeder in 1965.〔 All three ''Tuctoria'' species were formerly assigned to ''Orcuttia'', the type genus of Orcuttieae. Reeder erected ''Tuctoria'' after determining that the three species were more closely related among themselves than to any of the other ''Orcuttia'' species. Shared features include chromosome numbers, the spiral arrangement of spikelets on the rachis, the absence of juvenile leaves, the presence of lodicules, and the presence of an epiblast in the seed embryos. The name ''Tuctoria'' is an anagram of ''Orcuttia''.〔
Recent (2010) molecular phylogenetic analysis suggests that ''Tuctoria'' is not monophyletic as currently circumscribed, and is in need of taxonomic revision.〔
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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