180. Ipomoea conzattii Greenm., Publ. Field Columb. Mus., Bot. Ser. 2 (6): 258. 1907. (Greenman 1907: 258)

Exogonium conzattii (Grenm.) House, Bull. Torrey Bot. Club 35: 102. 1908. (House 1908a: 102).

Type.

MEXICO. Oaxaca, Almoloyas, C. Conzatti 1666 (holotype F0054836, isotypes MEXU, VT).

Description.

Twining liana; stems woody with grey bark, white canescent when young. Leaves absent at anthesis, petiolate, 1.5-10 × 1-6.5 cm, ovate-deltoid, subrhomboid, panduriform or shallowly 3 -lobed, margin undulate, apex acute, obtuse or retuse, mucronate, base truncate and cuneate onto the petiole, pubescent on both surfaces, abaxially paler; petioles 0.5-6 cm, pubescent. Inflorescence of very shortly pedunculate compact corymbs; peduncle 0.3-2.8 cm, sericeous; bracteoles 2-3 mm, ovate-deltoid, sericeous, caducous; secondary peduncles 1-5 mm; pedicels 12-15 mm, thickened upwards, canescent; sepals slightly unequal, outer 5-7 × 3-6 mm, elliptic, obtuse, densely pubescent to canescent, greenish, inner sepals obovate, rounded, pubescent in the centre but with broad glabrous scarious margins; corolla 3-4.5 cm long, cylindrical-hypocrateriform, deep pink, glabrous or with a few hairs, somewhat rugose, limb 2-3 cm diam., lobed, stamens exserted. Capsules ellipsoid, 9 × 6-8 mm, glabrous: seeds 6 × 3 mm, pilose on margins with long white hairs c. 7 mm long.

Distribution.

Endemic to central Mexico, growing around 1200 to 2200 m in dry deciduous woodland and scrub; apparently uncommon.

MEXICO. Est. México & Dist. Fed.: El Zapote, S. Zamudio 10995 (IEB, MEXU); Villa Guerrero, E. Matuda et al. 28029 (MEXU). Guerrero: Cerro Xilotzin, E. Moreno-G 871 (MEXU). Morelos: Xochicalco, Hahn s.n. (P); Cuautla, Sierra de Topotzlán, D.H. Lorence 5021 (MEXU, MO); Tezoyuca-E. Zapata, J. Vásquez 252 (MEXU); Cuernavaca, E. Fournier s.n. [1866] (P); E. Lyonnet 550400015 (IEB, MEXU). Oaxaca: Almolayas, C. Conzatti 1950 (F); Cuicatlan, J.I. Calzada 23880 (K, MEXU). Puebla: Tehuacán, C.A. Purpus 5833 (BM, MO); ibid., H.S. Gentry 23385 (ARIZ, DES, MEXU); Cuicatlán, G.A. Salazar et al. 9383 (MEXU); Caltepec, P. Tenorio & C. Romero 5100 (MEXU); R. Razo & R. Garcia III-39 (IEB). Veracruz: Long & Burch 3278 (F); Acutzingo, J.E. Rivera 5451 (MEXU).

Note.

Distinguished from related species by the relatively broad corolla limb, near glabrous corolla but canescent sepals and pedicels.