121. Ipomoea rzedowskii E. Carranza, Zamudio & G. Murghia, Acta Bot. Mex. 45: 32. 1998. (Carranza et al. 1998: 32)

Type.

MEXICO. Hidalgo, Mun. Zimapan, S. Zamudio R. & E. Pérez C. 9970 (holotype IEB000136313, isotypes ANSM, CAS, CIIDIR, IEB, MEXU, MICH, NY, QMEX, TEX, UAMIZ).

Description.

Shrub to 3 m, trunk grey-green to 20 cm thick, glabrous or white-puberulent, much branched at base. Leaves petiolate, 5.5-16.5 × 1.5-5.5 cm, lanceolate to ovate, acuminate, mucronate, base rounded to subcordate, glabrescent; petioles 2-6 cm. Inflorescence of 1-3-flowered cymes from the upper leaf axils; peduncles 0.8-2.6 cm, glabrous or puberulent; bracteoles caducous, not seen; pedicels 10-30 mm, thicker than peduncles; sepals equal, 11-21 × 6-13 mm, ovate, margin scarious, glabrous or puberulent; corolla 4.5-10 cm long, campanulate to broadly funnel-shaped, white, glabrous. Capsules 15-20 × 12-15 mm, ovoid, glabrous; seeds 11-14 mm long, ovoid, brown with long white hairs.

Distribution.

Endemic to central Mexico, where it grows in dry scrub on steep limestone rock slopes between 700 and 2000 m.

MEXICO. Hidalgo: Baranca Talantango, F. Miranda 4022 (MEXU). Querétaro: Cadereyta, SE de Mesa de León, S. Zamudio et al. 9162 (IEB, MEXU); ibid., La Tinaja, S. Zamudio & E. Pérez 9966 (ARIZ, IEB); Vizarrón-San Joaquin, R. Hernández et al. 10618 (MEXU).

Note.

This species is very close to Ipomoea intrapilosa, differing only in the key characters.