Ipomoea volcanensis O'Donell

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

146. Ipomoea volcanensis O'Donell , Lilloa 26: 398. 1953. ( O’Donell 1953a: 398)

Type.

ARGENTINA. Jujuy, [Dept. Tumbaya], Volcán, Toma de la Laguna, 2200 m, R. Schreiter 2619 (holotype LIL001290).

Description.

Twining perennial herb with tuberous roots; stems glabrous. Leaves petiolate, 6.5-8.5 × 5-7 cm, ovate-deltoid (often shallowly 3-lobed), subtruncate with rounded auricles, long-acuminate, mucronulate, margin somewhat undulate, glabrous on both surfaces; petioles 3-8 cm. Inflorescence of 1-5-flowered, pedunculate axillary cymes; peduncles 4-14 cm, relatively stout; bracteoles fugacious; secondary peduncles 1-2 cm; pedicels 20-35 mm; sepals subequal, convex, coriaceous, obtuse, glabrous, outer 6-8 × 4-6 mm, inner 8-9 × 6 mm, slightly larger, suborbicular; corolla 6-7 cm long, deep pink, glabrous, funnel-shaped, limb 3-3.5 cm diam., shallowly lobed. Capsules and seeds not seen.

Illustration.

Figure 85 ; O’Donell (1959b: 252).

Distribution.

In moist Tucuman-Bolivian forest in Andean Argentina and Bolivia at around 1500-2100 m.

ARGENTINA. Jujuy: Belgrano, O. Morrone et al. 2251 (SI, MO); Yala, A. Rotman 1010 (CTES); T. Meyer 16958 p.p. (US, LIL); Tumbaya, Volcán, S. Venturi 4951 (LIL, MO, US), Cildella et al. 517 (CTES); Vallegrande, Fabris 3554 (CTES). Salta: Rosario de Lerma, L.J. Novara 7605 (G, S).

BOLIVIA. Tarija: Entre Ríos, on road to Palos Blancos, J.R.I. Wood et al. 28059 (LPB, USZ).

Note.

Very similar to Ipomoea austrobrasiliensis differing in the slightly longer corolla, the subdeltoid, basally subtruncate, often shallowly lobed, consistently smaller leaves. It is also similar to the I. batatoides , which differs in the smaller, acuminate, ovate leaves and the fewer-flowered inflorescence. It also lacks the distinctive punctate abaxial leaf surface commonly found in that species.

Figures

Figure 85. Ipomoea volcanensis. A habit B outer sepal C inner sepal D corolla opened out to show stamens E ovary and style. Drawn by Rosemary Wise from T. Meyer 16958.