Ipomoea zimmermanii

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

77. Ipomoea zimmermanii J.A. McDonald, Brittonia 39: 108. 1987. (McDonald 1987b: 108)

Type.

MEXICO. Coahuila, Sierra de la Paila, A.D. Zimmerman 1948 (holotype TEX00372576, isotypes NY, TEX).

Description.

Trailing or twining perennial; stems woody, glabrous or thinly pubescent at nodes. Leaves petiolate, 3.8-4.5 × 3.5-4.5 cm, ovate to subtrilobate, apex obtuse or acute, margin sinuate, base cordate and cuneate onto the petiole, the auricles rounded, both surfaces glabrous; petioles 2.8-5.4 cm. Inflorescence of solitary, axillary flowers; peduncles 1.5-2.2 cm, glabrous or pubescent basally; bracteoles caducous, not seen; pedicels 18-23 mm; sepals equal, 13-16 × 4-5 mm, oblong-elliptic, outer with a few minute appressed hairs, inner with scarious margins; corolla opening at night, 4.5-6 cm long, hypocrateriform, tube purple inside, limb white c. 4 cm in diam., pilose on midpetaline bands; stamens exceeding corolla but not reported as exserted. Capsules and seeds unknown.

Distribution.

Only known from the type collected from the slopes of an arid inselberg at 1400 m.

MEXICO. Coahuila: type collection.

Note.

Reported as related to Ipomoea rupicola but differing in the white hypocrateriform corolla.