Ipomoea petrophila House

Wood, John R. I., Munoz-Rodriguez, Pablo, Williams, Bethany R. M. & Scotland, Robert W., 2020, A foundation monograph of Ipomoea (Convolvulaceae) in the New World, PhytoKeys 143, pp. 1-823 : 1

128. Ipomoea petrophila House , Bot. Gaz. 43 (6): 408. 1907. (House 1907b: 408)

Type.

MEXICO. Chihuahua, C.G. Pringle 340 (holotype US00111439, isotypes BM, F, GH, K, LIL, NY, RSA).

Description.

Perennial herb to 50 cm, similar in general habit to I. longifolia , stem softly pubescent. Leaves shortly petiolate, 4-8 × 1.5-2.5 cm, ovate or ovate-elliptic, acute, base cuneate, softly pubescent on both surfaces; petioles 2-5 mm. Flowers solitary, axillary, long-pedunculate; peduncles 2-3.5 cm, pubescent; bracteoles caducous, not seen; pedicels 9-13 mm, pubescent; sepals slightly unequal, outer 6-8 mm, oblong-ovate, obtuse, pubescent, inner 9-11 mm, oblong-elliptic with scarious glabrous margins; corolla c. 6 cm long, funnel-shaped, glabrous, pink, limb 3.5 cm diam. Capsules 13-15 × 10 mm, ovoid with a persistent style, glabrous; seeds 9-10 × 4-5 mm, blackish, minutely puberulent and with long white marginal hairs, c. 10 mm long.

Distribution.

Endemic to northern Mexico where it appears to be rare in rocky grassland.

MEXICO. Chihuahua: near Mapula, F. Shreve 9060 (ARIZ); Sierra Mapula, Rancho Picacho, E. Lehto et al. 21586 (MEXU); Presa Chihuahua, N of El Fresno, M. Fishbein et al. 7383 (ARIZ).

Note.

This species differs from other erect species with ovate-elliptic leaves from Mexico in its hirsute vegetative parts.