Ipomoea desrousseauxii Steud.

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

213. Ipomoea desrousseauxii Steud. , Nomencl. Bot. 1: 816. 1840. (Steudel 1840: 816)

Convolvulus eriospermus Desr. , Encycl. 3: 567. 1789 [pub. 1792]. (Desrousseaux 1792: 567). Type. Sine data, P-LAM (?P00666142).

Exogonium eriospermum (Desr.) Choisy , Mém. Soc. Phys. Genève 8 (1): 52[130]. 1838. (Choisy 1838: 52 [130]).

Ipomoea eriosperma (Desr.) Urb. , Symb. Antill. 3 (2): 351. 1902. (Urban 1902-3: 351), nom. illeg., non Ipomoea eriosperma P. Beauv. (1819) .

Ipomoea leuconeura Urb. , Symb. Antill. 3: 350. 1902. (Urban 1902-3: 350). Type. HAITI. L Picarda 16 (NY), C. Ehrenberg 134 (GH), W. Buch 5 (GH), syntypes.

Exogonium leuconeurum (Urb.) House , Bull. Torrey Bot. Club 35: 106. 1908. (House 1908a: 106).

Type.

Based Convolvulus eriospermus Desr.

Description.

Climbing perennial; stems glabrous, up to 4 m long. Leaves petiolate, usually small, digitately divided to or almost to the base into (3-)7 lobes, the lateral lobes often pedate, base truncate and broadly cuneate onto the petiole, lobes 0.7-6 × 0.2-1.5 cm, oblong-oblanceolate, obtuse or rounded, glabrous, abaxially gland-dotted; petioles 0.7-5 cm. Inflorescence of (1-)2-5(-10) flowers borne in short axillary cymes; peduncles 5-20 mm, glabrous; bracteoles 1 mm, scale-like, caducous; secondary peduncles c. 5 mm; pedicels 6-20 mm, straight, glabrous; sepals subequal, 4-6 mm, obovate-suborbicular, rounded, glabrous with scarious margins, the inner perhaps 1 mm longer than the outer; corolla 2.5-4 cm long, narrowly funnel-shaped to subcylindrical, c. 7 mm wide, the tube only slightly widening upwards, red, glabrous, the limb 2.5 cm diam. Capsules 9-10 × 5-6 mm, oblong-ovoid, glabrous, much exceeding the calyx; seeds 4-5 × 2 mm, pilose with long white hairs.

Distribution.

Widespread in dry forests in Hispaniola, often on limestone, where it is endemic.

HAITI. Montagnes du Trau d’Eau, E.L. Ekman H2126 (K, S), 3043 (S), 9761 (S); Port de Paix, E.L. Ekman H3546 (K, MO, NY, S); ibid., E.C. & G.M. Leonard 14602 (K, US).

DOMINICAN REPUBLIC. E.L. Ekman H14595 (S); Emanuelsson 2731 (S); El Plátano, Bayaguana, A.H. Liogier 18717 (K, NY); Azua, A.H. Liogier 24873 (NY); Cabo Rojo-Las Mercedes, A.H. Liogier 13815 (P); Beata Island, D. Fairchild 2611 (P).

Note.

Some specimens from Haiti, for example Ekman H9548 (S) and Ekman H9624(S), have stouter corollas, the tube c. 10 mm wide.