Ipomoea valenzuelensis Chodat & Hassl.

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

19. Ipomoea valenzuelensis Chodat & Hassl. , Bull. Herb. Boiss. Ser. 2: 5: 687. 1905. (Chodat and Hassler 1905: 687)

Ipomoea valenzuelensis forma glabrescens Chodat & Hassl. , Bull. Herb. Boiss. Ser. 2: 5: 687. 1905. (Chodat and Hassler 1905: 687). Type. PARAGUAY. Cordillera, Valenzuela, Jan. 1900, E. Hassler 7035 (? holotype G n.v., isotypes BM, K, NY, P).

Type.

PARAGUAY. Dept. Cordillera, Valenzuela, Jan. 1900, Hassler 7036 (? holotype G n.v., isotypes BM, F, GH, K, LIL, MO, MPU, NY, P, S, UC).

Description.

Trailing perennial with densely coarsely hirsute stems. Leaves shortly petiolate, 5-12 × 2-5 ovate, ovate-deltoid to oblong-elliptic (rarely shallowly 3-lobed), acute, base cuneate to rounded, densely hirsute on both surfaces, abaxially paler; petioles 5-13 mm, hirsute. Inflorescence of 1-3-flowered, pedunculate axillary cymes; peduncles 2.5-11 cm, hirsute; bracteoles filiform, 5-12 mm, caducous; pedicels 5-15 mm, hirsute; sepals 14-18(-20) × 4-8 mm, slightly unequal, ovate, caudate, densely hirsute, inner with subglabrous, slightly scarious margins; corolla 5.5-6.5 cm long, funnel-shaped, pink, densely pubescent, limb 4.5-5 cm diam., weakly lobed. Capsules 11 × 8 mm, ovoid, glabrous, shortly rostrate; seeds 6 × 3.5 mm, ovoid, blackish-brown, glabrous.

Distribution.

Endemic to Paraguay where it grows in cerrado-like vegetation. PARAGUAY. Sine data, Jorgensen 3475 (F, S). Cordillera: Valenzuela, R.O. Vanni et al. 1154 (MO, CTES, K). Guairá: Villarrica, E. Hassler 8577 (BM), 8827 (BM); Villa Rica-Independencia, N. Soria 4233 (FCQ, MA, MO); F. Mereles & M. Soloaga 7561 (CTES, FCQ); Cordillera del Ybytyrusú, E. Zardini & A. Aguayo 14896 (FTG, MO, FCQ).

Typification.

We have not seen specimens of the type nor of var. glabrescens at Geneva, so have not made any lectotypifications.

Note.

This species is characterised by its decumbent habit, coarsely hispid indumentum and long, caudate sepals. It is similar to Ipomoea pseudocalystegia but the leaves are simple, the sepals and bracteoles are shorter and the pedicels much longer. It also somewhat resembles Ipomoea langsdorffii but the flowers are often solitary and never in many-flowered cymes, and the leaves are not whitish beneath.