[mass noun]a herbaceous American plant with milky sap. Some kinds attract butterflies, some yield a variety of useful products, and some are grown as ornamentals 马利筋
Genus Asclepias, family Asclepiadaceae 马利筋属,萝藦科
(亦作 milkweed butterfly). another term for monarch (in sense 2) 同 monarch (义项2)