122. Ipomoea chilopsidis Standl., Publ. Field Mus. Nat. Hist., Bot. Ser. 17: 206. 1937. Standley 1937: 206)

Type.

MEXICO. Chihuahua, Quasaremos, H.S. Gentry 2391 (holotype F0054835, isotypes A, ARIZ, K, MEXU, MO, S, UC, US).

Description.

Shrub 2-5 m high, stems glabrous. Leaves shortly petiolate, 5-20 × 0.7-1.3 cm, elongate, oblong, slightly falcate, acuminate at both ends, glabrous; petioles 8-13 mm. Flowers apparently solitary, axillary; peduncles 6-18 mm; bracteoles not seem; pedicels 1-2.5 cm; sepals subequal, 12-17 × 7-9 mm, abaxially glabrous, adaxially pubescent, outer ovate, acute, mucronulate; inner elliptic, obtuse, with scarious margins; corolla 8-9 cm long, funnel-shaped, white with purple throat, glabrous, limb c. 5 cm diam., entire. Capsules 15-18 × 12 mm, shortly rostrate; seeds pilose on margins with hairs c. 10 mm long.

Distribution.

Endemic to the Sierra Madre Occidental in NW Mexico at 1000-1800 m on "high arid crags" in oak and pine forest.

MEXICO. Chihuahua: Barranca de Batopilas, R. Felger & R. Russel 8078-B (ARIZ); canyon of the Río Batapilas, V. Siplivinsky et al. 3999 (DES). Durango: S. González & R.R. Clinebell 6360 (IEB). Sonora: Mesa Atravesada, 1000 m, P.S. Martin et al. s.n. (ARIZ); Sierra Sahuaribo, V.W. Steinmann et al. 93-284 (ARIZ).

Note.

Rather distinctive because of the narrowly oblong, falcate leaves.