172. Ipomoea discolor (Kunth) G. Don, Gen. Hist. 4: 270. 1838. (Don 1838: 270)

Convolvulus discolor Kunth, Nov. Gen. Sp. 3: 105 (1818 [pub. 1819]. (Kunth 1819: 105), nom. cons. Type. VENEZUELA. Amazonas, Carichana, Humboldt & Bonpland 1045 (holotype P00670759).

Ipomoea irengana N.E. Br., Trans. Linn. Soc. London, Bot. ser. 2, 6: 51. 1901. (Brown, NE 1901: 51). Type. GUYANA. Ireng Valley, McConnell & Quelch, 265 (lectotype K000612822, designated here).

Type.

Based on Convolvulus discolor Kunth

Description.

Slender twining herb, stems pubescent. Leaves petiolate, very small, 1.2-4 × 1.2-2.3 cm, ovate, obtuse and mucronate, shallowly cordate with rounded auricles, adaxially green, tomentellous, abaxially white-canescent. Flowers solitary, axillary; peduncles 4-25 mm, pubescent; bracteoles filiform, c. 1 mm, caducous; pedicels 6-15 mm, pubescent; sepals subequal, 7-11 mm long, oblong-lanceolate, acute or obtuse, outer pubescent, inner glabrous, scarious, more rounded; corolla 3.5-5.5 cm long, pale pink, funnel-shaped, thinly pubescent, limb undulate, 3.5-4 cm diam.

Illustration.

Austin (1998: 399).

Distribution.

Dry rocky hills at low altitudes in Venezuela and Guyana; apparently uncommon.

GUYANA. Type of Ipomoea irengana .

VENEZUELA. Bolívar: Cedeño District, B. Boom & Grillo 6399 (FTG, NY); Cerro Gavilan, J. Wurdack & J.V. Monachino 40901 (FTG, NY); Agua Amena, J. Steyermark et al. 131440 (FTG, MO); 1 km S of Quebrada la Flore, J. Steyermark et al. 131637 (FTG). Lara: between Quibor and Cubiro, D.F. & S. Austin 6019 (FTG).

Note.

This species is anomalous in this clade because of the thinly pubescent corolla.