| 词条 | Streptanthus cordatus |
| 释义 |
|image = Streptanthus cordatus var cordatus 8.jpg |genus = Streptanthus |species = cordatus |authority = Nutt. }} Streptanthus cordatus is a species of flowering plant in the mustard family known by the common name heartleaf twistflower.[1][2] It is native to the western United States, where it can be found in many types of sagebrush, woodland, and forest habitat. It is a perennial herb producing a branched or unbranched stem up to about a meter tall. It is often waxy in texture. The basal leaves are oval or spoon-shaped with bristle-toothed blades borne on rough-haired petioles. Leaves higher on the stem are oval to lance-shaped, up to 9 centimeters long with their bases usually clasping the stem. Flowers occur at intervals along the upper stem. Each has a calyx of sepals roughly a centimeter long which begin greenish yellow and mature purple. Four purple petals emerge from the tip of each calyx. The fruit is a thin, narrow silique which may reach 14 centimeters in length or longer. {{Commons|Streptanthus cordatus}}References1. ^{{cite web|url=http://www.swcoloradowildflowers.com/yellow%20enlarged%20photo%20pages/streptanthella%20and%20streptanthus.htm|title=Streptanthus cordatus (Heartleaf Twistflower)Brassicaceae (Mustard Family)_WildFlower}} 2. ^{{cite web|url=http://plants.usda.gov/core/profile?symbol=STCOC|title=Streptanthus cordatus Nutt. var. cordatus heartleaf twistflower_Plant Profile_USDA NRCS}} External links
2 : Streptanthus|Flora of North America |
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