Amsonia hubrichtii, commonly known as Hubricht's bluestar, Arkansas bluestar, or thread-leaf bluestar, is a North American species of perennial flowering plant in the Apocynaceae (dogbane) family, first described in 1943.Woodson, Robert Everard 1943. A new Amsonia form the Ozarks of Arkansas. Rhodora 45(536): 328–329 It is native to Oklahoma and Arkansas in the south-central United States.Kew World Checklist of Selected Plant FamiliesBiota of North America Program 2013 county distribution map It is commonly used as an ornamental plant.
Description A. hubrechtii grows high with upright stems that form bushy clumps. Leaves are very narrow, numerous, and alternate, giving the plant a feathery appearance. In the spring the leaves are bright green, and they turn gold in the fall. The flowers, borne in clusters at the end of each stem in the spring, are a powdery blue color and across. The flowers have 5 petals and fade to white with warmer temperatures.
Distribution and habitat The plant is known from a limited number of populations in Oklahoma and Arkansas, primarily within the Ouachita Mountains Natural Division. In Oklahoma, it is considered an endangered species. It grows well in poor soils and full to partial sun.
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photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 1940