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The Crown vetch (Coronilla varia) belongs to Fabaceae (the Pea family). It is a perennial herb that is native to Europe. And it is naturalized in North America, Middle and Near East, and Japan nowadays. This herb grows in dry grassy places, railway embankment, roadsides etc. and it can reach 30-100 cm in height. The leaves are impari-pinnate compound with oblong leaflets. The small pink and white flowers bloom in the small clusters of 10-15 mm from early summer to late fall. It is commonly used for erosion control, roadside planting and soil rehabilitation. The whole plant contains a toxic glycoside called coronillin.
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