perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant
N
any of several North American boraginaceous plants of the genus Lithospermum, esp L. canescens, that yield a red dye 紫草属植物 (Also called alkanet)
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see also
gromwell