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Oxybasis
''Oxybasis'' is a flowering plant genus from the subfamily Chenopodioideae in the Amaranthaceae family. It was first described in 1841, and newly used since 2012 for five species that were traditionally grouped into genus ''Chenopodium''.〔 They occur in Europe, Asia, North Africa and America.〔
== Description ==
According to Fuentes-Bazan et al. (2012), the species in genus ''Oxybasis'' are non-aromatic annual herbs. Their stems grow erect to ascending or prostrate and are branched with usually alternate, basally sometimes nearly opposite branches. The alternate leaves consist of a petiole and a simple blade. The leaf blade is thickish oder slightly fleshy, and may be triangular, triangular to narrowly triangular, hastate, rhombic, or lanceolate, with entire to dentate margins.
The axillary and terminal inflorescences consist of spicately or sometimes paniculately arranged compact glomerules of flowers, ebracteate or in the axils of leaf-like bracts. Usually there a two types of flowers: The terminal flowers are bisexual, with 3-5 nearly free perianth segments, 1 (-5) stamens and an ovary with 2 (-3) stigmas. The lateral flowers are usually female, with 3 (-4) variously connate perianth segments, missing (-1) stamens and 2 stigmas.
The fruit has a membranous pericarp, which is free or loosely attached to the seed. The oval to orbicular seeds are horizontally orientated in terminal flowers, but vertically or horizontally in lateral flowers. The brownish or black seed coat can be almost smooth, finely reticulate, or minutely pitted.
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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