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Senecio ertterae
''Senecio ertterae'' is a species of flowering plant in the aster family known by the common name Ertter's ragwort. It is endemic to Oregon in the United States.〔(''Senecio ertterae''. ) The Nature Conservancy.〕
This annual herb grows 20 to 50 centimeters tall, sometimes reaching 60 centimeters or more. The leaves and stems are slightly succulent. The lance-shaped or spatula-shaped leaves are borne on winged petioles. The inflorescence is a cyme-shaped array of several flower heads. The yellow ray florets are each about half a centimeter long.〔(''Senecio ertterae''. ) Flora of North America.〕 Flowering occurs in July through October.〔
This species occurs in the Leslie Gulch in eastern Oregon, in Malheur County. It is limited to soils of rhyolite and tuff. The terrain is subject to disturbance, such as flooding and erostion. Other plants in the sparsely vegetated habitat include ''Pseudoroegneria spicata'' (bluebunch wheatgrass), ''Bromus tectorum'' (cheatgrass), ''Mimulus cusickii'' (Cusick's monkeyflower), ''Eriogonum vimineum'' (broom buckwheat), and ''Phacelia hastata'' (silverleaf phacelia).〔(''Senecio ertterae''. ) Center for Plant Conservation.〕
An annual species, this plant may be much more prevalent in years with sufficient rainfall.〔 At times it is locally abundant.〔
==References==
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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