Ipomoea jicama 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

296. Ipomoea jicama Brandegee , Proc. Calif. Acad. Sci., ser. 2, 2: 188. 1889. (Brandegee 1889: 188)

Ipomoea odorata Eastw., Leafl. W. Bot. 3: 257. 1943. (Eastwood 1943: 257). Type. MEXICO. Baja California Sur, 5 miles N. of Comondu, B.J. Hammerly 172 (holotype CAS0003018, isotype CAS).

Type.

MEXICO. Baja California Sur, Magdalena Island, T.S. Brandegee s.n. 1889 (holotype UC105236; isotype US, fragment GH).

Description.

Perennial twining herb with tuberous roots to 2 m, stem glabrous. Leaves petiolate, 4-5.5 × 2-3 cm, broadly ovate, cordate, acute, margin weakly to strongly sinuate-dentate with broad irregular teeth, glabrous; petioles 1-3.5 cm. Flowers solitary or in few-flowered axillary cymes; peduncles 1-1.5 cm; bracteoles c. 1 mm, scale-like, caducous; pedicels 22-35 mm, thickened upwards; sepals unequal, glabrous, outer 10-12 mm, lanceolate, acute, inner 16-22 mm, narrowly ovate, acute and apiculate; corolla 5-6 cm long, funnel-shaped above a basal tube 1-1.5 cm long, glabrous, pale pink with a white throat, limb 4-4 cm diam., weakly lobed; stamens included. Capsules ovoid, 8-9 × 6 mm, glabrous; seeds up to 4, 5-7 mm long, shortly puberulent.

Illustration.

McDonald (1987c: 87).

Distribution.

Endemic to the southern part of the Baja California peninsula, where it grows on rocky slopes in dry deciduous forest around 500-600 m.

MEXICO. Baja California Sur: Sierra de la Giganta, Valle de Arroyo Hondo, A. Carter 5007 (BM), 5620 (BM, MICH, MO, UC); sine data, M.L. Diguet (P).

Note.

Somewhat similar to Ipomoea tastensis but the corolla much smaller and the stamens included.