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.
Amsonia is named in honor of the American physician John Amson. Members of the genus are commonly known as bluestars.
- 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
- Amsonia grandiflora Alexander – Arizona Bluestar - Arizona, Sonora, Durango
- Amsonia hubrichtii Woodson – Hubricht's Bluestar - Arkansas, Oklahoma
- Amsonia illustris Woodson – Ozark Bluestar - Mississippi Valley, also Nevada
- Amsonia jonesii Woodson – Jones' Bluestar - Arizona, New Mexico, Utah, Colorado
- Amsonia kearneyana Woodson – Kearney's Bluestar - Baboquivari in Pima Co. in Arizona
- Amsonia longiflora Torr. – Tubular Bluestar - Arizona, New Mexico, Texas, Coahuila
- Amsonia ludoviciana Vail – Louisiana Bluestar - Louisiana, Mississippi, Georgia
- Amsonia orientalis Decne. – European Bluestar - Greece, Turkey
- Amsonia palmeri A.Gray – Palmer's Bluestar - Arizona, New Mexico, Texas, Sonora, Chihuahua
- Amsonia peeblesii Woodson – Peebles' Bluestar - Arizona
- Amsonia repens Shinners – Creeping Bluestar - E Texas, SW Louisiana
- Amsonia rigida Shuttlw. ex Small – Stiff Bluestar - from Georgia to Louisiana
- Amsonia tabernaemontana Walter – Eastern Bluestar - S + C + E United States
- Amsonia tharpii Woodson – Feltleaf Bluestar - W Texas, SE New Mexico
- Amsonia tomentosa Torr. & Frém. – Woolly Bluestar - SW US; Chihuahua
||Wikimedia Commons has media related to Amsonia.