- Amsonia, genus Amsonia - genus of herbs and subshrubs with milky juice and showy bluish flowers; Europe to Asia Minor to Japan and North America
--1 is a kind of dicot genus, magnoliopsid genus
--1 is a member of Apocynaceae, family Apocynaceae, dogbane family
--1 has members: blue star, Amsonia tabernaemontana