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Silphium perplexum
Silphium perplexum J.R.Allison is a prairie species in the Asteraceae endemic to the state of Alabama. S. perplexum is commonly known as Old Cahaba rosinweed, a reference to the Cahaba River near which all populations of this species are found.
This species is endemic to only three counties in west-central Alabama, it has an extremely limited distribution with all populations less than 9 miles from the Cahaba River. Old Cahaba rosinweeds favor soils overlying chalk, this contrasts with the parent species S. glutinosum which prefers growing over dolomite or limestone. S. perplexum is most numerous in prairies and openings within scrub and forest. This species is found alongside other tallgrass-prairie plants including grasses such as Andropogon L. spp. and Schizachyrium scoparium (Michx.) Nash. as well as legumes including Desmanthus illinoensis (Michx.) MacMill. ex B.L.Rob. & Fernald. and shrubs including Rosa bracteata J.C.Wendl.
White rosinweed · Starry rosinweed · Cumberland rosinweed · Kidneyleaf rosinweed · Wholeleaf rosinweed · Compassplant · Mohr's rosinweed · Cup plant · Tansy rosinweed · Roughstem rosinweed · Prairie rosinweed · Whorled rosinweed
Text excerpted from the Wikipedia article Silphium perplexum by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
