Ipomoea discoidea Gonzalez-Martinez & J. Jimenez Ram.

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

421. Ipomoea discoidea Gonzalez-Martinez & J. Jimenez Ram. , Brittonia 67: 320. 2015. ( Jiménez Ramírez and González-Martínez. 2015: 320)

Type.

MEXICO. Guerrero, Mun. Chilpancingo de los Bravos, C.A. González-Martínez & S. Ríos-Carrasco 761 (holotype FCME151016, isotype FCME).

Description.

Slender annual night-flowering twining herb, stems glabrous, up to 5 m long. Leaves petiolate, 6-10 × 4-7 cm, ovate, acuminate and mucronate, base cordate with obtuse auricles, both surfaces glabrous; petioles 3-5 cm long, setose below the junction with the leaf. Inflorescence of pedunculate, axillary 2-flowered cymes; peduncles up to 9 cm long, setose at the base, gland-dotted, sticky; bracteoles ovate, c. 1.5 mm long, caducous; secondary peduncles 5-13 mm; pedicels 7-8.5 mm, somewhat accrescent in fruit, sticky-glandular, otherwise glabrous; receptacle forming a swollen disc at base of flowers; sepals subequal, 4-5 × 2-2.5 mm, ovate-deltoid, acute, glandular, becoming reflexed in fruit; corolla 4.5-5.3 cm long, cylindrical-hypocrateriform, greenish-white, glabrous, limb c. 5 cm diam., unlobed; stamens weakly exserted. Capsules ovoid, c. 2 × 1.5 cm, rostrate, glabrous; seeds c. 10 × 7 mm, ellipsoid, pubescent and with long white marginal hairs 11-12 mm long.

Illustration.

Jiménez Ramírez and González-Martínez (2015: 321).

Distribution.

Endemic to Mexico growing at around 800-1000 m in semi-deciduous forest.

MEXICO. Guerrero: type locality. Jalisco: Mun. El Limon, Cerro el Carrizal, A. Flores 3679 (MEXU).

Note.

Very distinctive because of the setose peduncles and the disc-like receptacle. The peduncles, pedicels and sepals are reported to be sticky glandular. The annual habit combined with the hypocrateriform white corolla is also unusual.