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Gutierrezia sarothrae
''Gutierrezia sarothrae'' is a species of flowering plant in the daisy family known by the common names broom snakeweed, broomweed, snakeweed, and matchweed. It is a subshrub native to much of the western half of North America, from western Canada to northern Mexico, and can be found in a number of arid, grassland, and mountain habitats. It can be toxic to livestock in large quantities, due mainly to the presence of saponins.
''Gutierrezia sarothrae'' is commonly confused with rabbitbrush, but can be distinguished by the presence of ray flowers, which rabbitbrush plants do not have.
==Botanical Description==
''Gutierrezia sarothrae'' is a perennial subshrub that ranges from in height. The stems are green to brown, bushy, and herbaceous, and branch upwards from a woody base.〔 The stems die back during dormancy, giving the plant its broom-like appearance.〔 They range from smooth to having some short hairs, and may be resinous and therefore sticky when touched. Dense clusters of small, yellow ray flowers form in clusters at the end of the stems from mid-July to September.〔 As the stems are about the same length, this causes the plant to often appear domed or fan-shaped when flowering.〔 The leaves are alternate and linear, and long and wide.〔 The lower leaves are usually shed before the plant flowers.〔 During its first year of growth, ''G. sarothrae'' produces a long, woody taproot, and numerous lateral roots as the plant matures.
The flowers of ''G. sarothrae'' are pollinated by various insects, resulting in an oval fruit covered with chaffy scales.〔 The plant reproduces from seeds, which are light, densely hairy, and wind-dispersed.〔〔 A single plant is capable of producing over 9000 seeds annually, although most ripe seeds fall beneath the parent plant.〔 Seeds can remain viable in the soil for several years; under laboratory conditions seeds have remained viable for at least two years.〔
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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