Amsonia longiflora var. salpignantha (Woodson) S. P. Mc Laughlin

Amsonia salpignantha Woodson, Ann. Mo. Bot
Gard. 15: 417. 1928.
Stems 2-3.5 dm. tall, more or less densely pilose; leaves alternate to subverticillate, membranaceous, sessile or subsessile, linear-lanceolate to subfiliform, 2-5 cm. long, 1-2 mm. broad, pilose or pilosulous; inflorescence barely surpassing the foliage, greatly condensed, bearing several to numerous, showy, pale-lead-blue or white flowers; pedicels 1-4 mm. long, pilosulous; calyx-lobes linear-lanceolate, acuminate, 4-6 mm. long, pilosulous; corolla glabrous externally, the tube 35-40 mm. long, about 1.5 mm. in diameter at the base, somewhat inflated at the insertion of the stamens, sharply constricted at the orifice, the lobes 5-8 mm. long, spreading; follicles slender, continuous, 7-9 cm. long, glabrous.
Type locawty: Rocky prairies on the Cowhouse Creek, Hamilton County, Texas. Distribution: Southwestern Texas; Chihuahua.