Ipomoea puncticulata Benth.

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

308. Ipomoea puncticulata Benth. , Bot, Voy. Sulphur 136. 1844 [pub. 1845]. (Bentham 1845: 136)

Ipomoea sagittula House, Ann , New York. Acad. Sci. 18: 244. 1908. (House 1908b: 244). Type. MEXICO. Jalisco, San Sebastián-Las Palmas, E.W. Nelson 4129 (holotype US00111463, isotype GH).

Type.

MEXICO. Guerrero, circa Acapulco, Sinclair s.n. (holotype K000612722).

Description.

Slender twining perennial with wiry whitish stems with flaky bark, reaching several metres in length, sometimes rooting at the nodes. Leaves petiolate, 2-8 × 1-6 cm, lanceolate, acute and mucronate, base sagittate, cordate or subtruncate, the auricles up to 1 cm long, adaxially glabrous, abaxially paler, white-punctate, glabrous or puberulent; petioles 3-20 mm. Inflorescence of 1-5-flowered axillary cymes; peduncles 1.5-2 cm, often penetrating leaf sinus as in I. aristolochiifolia ; bracteoles scale-like, c. 1 mm long; pedicels 5-10 mm; sepals very unequal, oblong-elliptic to lanceolate, outer 2-5 × 2 mm, acute, inner 5-7 mm, rounded; corolla 3.5-4 cm long, funnel-shaped, gently flared from a slender base, white, glabrous, limb 3.5-4 cm diam., unlobed. Capsules ovoid, 8-9 × 6-7 mm; seeds 4, 4 × 3 mm, dark brown, puberulent.

Illustration.

McDonald (1987c: 82).

Distribution.

A rare species of central Mexico, growing in disturbed deciduous forest between 400 and 1800 m.

MEXICO. Guerrero: Vallecitos, Montes de Oca, G.B. Hinton 11612 (GH, K, MO, US); La Unión, V.W. Steinmann & J.M. Porter 9496 (MEXU). Jalisco: NW of San Sebastián, Y. Mejia 1896 (BM, F, GH, MO, US); 7 miles S of El Tuito, R. Spellenberg 6438 (MICH). Michoacán: Coalcomán, G.B. Hinton 12594 (F, GH, K, MO, US); ibid., Aguila G.B. Hinton 12615 (K); San Juan de Lima, R. McVaugh 22991 (MICH); Lazáro Cárdenas, E. Carranza & I. Silva 7279 (MEXU). Nayarit: G. Flores et al. 943 (MO); San Blas & Tepic, G.W. Barclay s.n. (BM).

Note.

In the type the leaves are densely white-punctate on the lower surface. These dots only occur obscurely in Hinton 11612 and 12594.