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Gutierrezia microcephala
''Gutierrezia microcephala'' is a species of flowering plant in the daisy family known by the common names sticky snakeweed, threadleaf snakeweed, threadleaf broomweed, and smallhead snakeweed. It is a subshrub native to the southwestern United States and northern Mexico, and can be found in arid grassland and desert sand dune habitats. It can be toxic to livestock in large quantities, due to the presence of saponins and high concentrations of selenium.
==Botanical Description==
''Gutierrezia microcephala'' is a small, resinous, perennial desert subshrub that is typically in height and less than in diameter. It is heavily branched, often causing it to be nearly spherical.〔 New shoots and twigs are green to yellow in color, and older parts are brown and woody.〔 The leaves are linear, threadlike, and alternate; long and wide.〔〔(【引用サイトリンク】url=http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066825 )〕 Along with the leaves, the stem tissue is photosynthetic, giving the plant a high photosynthetic capacity.〔 ''G. microcephala'' typically flowers July to October,〔 but this can vary depending on the amount of precipitation.〔
When flowering, the tips of stem branches are occupied by sessile inflorescences of 5 or 6 flowers. The knobby, waxy yellow flower buds open into golden yellow flower heads, each of which has one or two disc florets between in diameter, and one or two ray florets between in diameter.〔 The mature plants produce many achene, although most seeds fall within a few metres of the parent plant.〔 This is because the plant grows a very small pappus, which makes wind-borne seed distribution very inefficient.〔
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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