Ipomoea tastensis Brandegee

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

297. Ipomoea tastensis Brandegee , Zoë 5: 169. 1903. (Brandegee 1903-5: 169)

Calonyction tastense (Brandegee) House , Bull. Torrey Bot. Club 33: 318. 1906. (House 1906: 318).

Type.

MEXICO. Baja California Sur, Sierra El Taste, T.S. Brandegee s.n. [11/1902] (lectotype UC105180, designated by McDonald (1987c: 70).

Description.

Liana to 10 m, stems woody, glabrous, twining; rootstock tuberous. Leaves petiolate, 4-10 × 3-7 cm, ovate, long-acuminate, cordate to sagittate, the auricles with deltoid teeth, margin usually with several large teeth, glabrous; petioles 2-5.5 cm, slender. Flowers solitary, axillary; peduncles 1-3 cm; bracteoles caducous, not seen; pedicels 20-45 mm, thickened upwards; sepals unequal, lanceolate, acuminate, glabrous but basally muricate, outer 16-30 × 3-5 mm, inner 26-37(-50) mm; corolla 9-12 cm long, white, glabrous, subhypocrateriform, the basal tube long, c. 6 cm in length, limb 5-8 cm diam., lobes mucronate; stamens inserted high in tube and shortly exserted. Capsules subglobose, 1.5-2 × 1.5 cm; seeds 9-12 mm long, puberulent.

Illustration.

McDonald (1987c: 87).

Distribution.

Endemic to the southern part of the Baja California peninsular, where it grows in low deciduous forest at around 400 m.

MEXICO. Baja California Sur: one mile W of San Antonio, B.J. Hammerly 416 (CAS, US); Sierra San Francisquito, T.S. Brandegee Oct 1 1899 (US); El Palmiar Canyon, R.M. Turner & C.H. Lowe 59-138 (ARIZ); 3 km al N. del Poblado La Huerta, M. Domínguez-L. 3526 (ARIZ, HCIB).

Note.

The stamens are reported to be exserted but this is only visible in one specimen.