Single paired follicle (i.e. V-shaped pair of follicles) detached from specimen of Amsonia tabernaemontana
Amsonia is a genus of flowering plants in the dogbane family, Apocynaceae, first described as a genus in 1788. It is native primarily to North America with one species in East Asia and another in the eastern Mediterranean. It was named in honor of the American physician John Amson. Members of the genus are commonly known as bluestars.
Species
Amsonia ciliata Walter – fringed bluestar – SE US, S Great Plains
Amsonia elliptica (Thunb. ex Murray) Roem. & Schult. – Japanese bluestar – China, Japan, Korea
Amsonia fugatei S.P.McLaughlin – San Antonio bluestar – New Mexico
↑"Genus: Amsonia Walter". Germplasm Resources Information Network. United States Department of Agriculture. 2003-03-14. Archived from the original on 2012-10-12. Retrieved 2011-09-23.