Flower (37 K)	Leaf (5 K)
	Plant (37 K)	Flower (35 K)

There are two subspecies recognized by Woodson (Ann. Missouri Bot. Gard. 41:1-211. 1954) that occur in the Great Plains (although they are of questionable validity):
Asclepias tuberosa interior Perennial herb from a deep, woody root stock 3-9 dm tall leaves mostly alternate, 5-10 cm long, 0.7-2.3 cm wide Flowers: bright orange, rarely red or yellow Habitat: Sandy, loamy, or rocky calcareous soils of prairies, roadsides, & waste places Distribution: MN, e SD, IA, e 1/2 NE, e 2/3 KS, MO, OK, TX; (se Can., NY to MN, SD, s to MS & TX)	Asclepias tuberosa terminalis Perennial herb from a deep, woody root stock 3-9 dm tall leaves mostly alternate, 5-10cm long, 0.7-2.3cm wide Flowers: bright orange, rarely red or yellow Habitat: Sandy prairies and open woodlands Distribution: CO: El Paso, Pueblo, Yuma; MN: Stearns; NM: Union; OK: Cimarron; SD: Fall River; TX: Hutchinson; (MI, WI, CO, s to UT, AZ; n Mex.)
Text taken from: Great Plains Association, 1986. Flora of the Great Plains. University Press of Kansas.