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''Astragalus hypoxylus'' is a rare species of flowering plant in the legume family known by the common name Huachuca milkvetch, or Huachuca Mountain milkvetch. It is endemic to Arizona in the United States, where it is known only from the Patagonia and Huachuca Mountains.〔(''Astragalus hypoxylus''. ) The Nature Conservancy.〕 There are three populations.〔(''Astragalus hypoxylus'' ). Center for Plant Conservation.〕 This small perennial herb forms a patch on the ground no more than about 10 centimeters wide and 3 to 4 centimeters tall. It grows from a fibrous taproot. The alternately arranged leaves are each made up of several pairs of gray-green leaflets which are a few millimeters long. The inflorescence is a flower cluster about a centimeter wide containing tiny white flowers with purple tips. The flowers bloom in April and May and are pollinated by bees of the genera ''Anthophora'', ''Bombus'', and ''Osmia''. The fruit is a yellow and purple legume pod about a centimeter long. This ''Astragalus'' looks so different from other species that it was once classified in a monotypic genus all its own.〔 This plant grows in woodlands dominated by Emory oak (''Quercus emoryi''), Mexican blue oak (''Q. oblongifolia''), alligator juniper (''Juniperus deppeana''), and Mexican pinyon (''Pinus discolor''). The substrate is a gravelly soil rich in limestone and metamorphic rock.〔 ''Astragalus hypoxylus'' is a rare species of flowering plant in the legume family known by the common name Huachuca milkvetch, or Huachuca Mountain milkvetch. It occurs in five populations in Arizona in the United States, where it is known only from the Patagonia and Huachuca Mountains. It also occurs in the Yécora area in the Sierra Madre Occidental in eastern Sonora, Mexico. This small perennial herb forms a patch on the ground no more than about 10 centimeters wide and 3 to 4 centimeters tall. It grows from a fibrous taproot. The alternately arranged leaves are each made up of several pairs of gray-green leaflets which are a few millimeters long. The inflorescence is a flower cluster about a centimeter wide containing tiny white flowers with purple tips. The flowers bloom in April and May and are pollinated by bees of the genera ''Anthophora, Bombus'', and ''Osmia''. The fruit is a yellow and purple legume pod about a centimeter long. This ''Astragalus'' looks so different from other species that it was once classified in a monotypic genus all its own. This plant grows in woodlands dominated by Emory oak (''Quercus emoryi''), Mexican blue oak (''Q. oblongifolia''), alligator juniper (''Juniperus deppeana''), and border pinyon (''Pinus discolor''). The substrate is a gravelly soil rich in limestone and metamorphic rock. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Astragalus hypoxylus」の詳細全文を読む スポンサード リンク
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