Ipomoea schulziana 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

149 . Ipomoea schulziana O'Donell , Lilloa 14: 186. 1948. ( O’Donell 1948a: 186)

Type.

ARGENTINA. Salta, Oran, San Pedrito, senda a Astillero, Schulz 5483 (holotype LIL107492).

Description.

Robust twining liana reaching at least 6 m in height, commonly leafless when flowering, roots tuberous, stems glabrous. Leaves petiolate, mostly 3-8 × 1.5-4 cm, oblong-ovate, acute and mucronate, basally broadly cordate to truncate, margin slightly undulate, glabrous, adaxially green, abaxially somewhat glaucous and with prominent veins; petioles 1-3.5 cm. Inflorescence of axillary, pedunculate simple or compound cymes often developing on axillary branchlets, sometimes very dense and floriferous or panicle-like; peduncles 0.5-5 cm long; bracteoles caducous, not seen; secondary peduncles 0.5-2.5 cm; pedicels 3-8 mm, thickened upwards; sepals slightly unequal, coriaceous, glabrous, outer sepals 5-6 mm, convex, elliptic, obtuse with scarious margins, the inner 7-8 mm, suborbicular, rounded; corolla 5-6.5 cm long, pink, glabrous, funnel-shaped, limb c. 3 cm diam., unlobed. Capsules glabrous; seeds pilose on the angles.

Illustration.

O’Donell (1959b: 236). Figure 88 .

Distribution.

A characteristic species of open woodland in the Inter-Andean dry valleys and Bosque Serrano Chaqueño between (200-)850 and 2100 m in southern Bolivia and extreme northern Argentina.

ARGENTINA. Jujuy: Laguna de la Brea, R.E. Fries 436 (S). Salta: type of Ipomoea schulziana .

BOLIVIA. Chuquisaca: Boeto, below Nuevo Mundo, M. Kessler 5198 (LPB); Oropeza, Sucre-Surima, J.R.I. Wood & J. Gutiérrez 20232 (BOLV, HSB, K, LPB); Sud Cinti, Las Abras, R. Lozano et al. 1375A (MO); Tomina, Llantoj, J. Gutiérrez et al. 996 (HSB, NY, MO); Zudañez, ANMI El Palmar, J. Gutiérrez et al. 2806 (HSB). Cochabamba: Campero, Río Mizque, north of Aiquile, J.R.I. Wood 9466 (K, BOLV, LPB). Santa Cruz: Caballero, Pulquina-Saipina, J.R.I. Wood et al. 27705 (OXF, K, LPB, USZ); Chiquitos, Tucavaca valley, J.R.I. Wood et al. 29394 (LPB, USZ); Cordillera, Camiri, W.M.A. Brooke 5546 (BM, NY, F); camino San José to Salinas, A. Fuentes & G. Navarro 2012 (USZ); Florida, Mairana, M. Nee 49260 (NY, USZ); Vallegrande, Pampa Negra to Naranjos, G.A. Parada & V. Rojas 2652 (OXF, MO, USZ). Tarija: Arce, S.G. Beck et al. 31416 (LPB); Gran Chaco, ANMI Aguaraque, A. Lliully 980 (HSB).

Note.

Very similar vegetatively to Ipomoea suburceolata but easily distinguished by the funnel-shaped corolla with a well-developed entire limb. It has often been misidentified as I. batatoides but differs in the leaf shape and inflorescence structure, the flowers often being borne on leafy side shoots.

Figures

Figure 88. Ipomoea schulziana. A habit B adaxial leaf surface C abaxial leaf surface D outer sepal E inner sepal F bud G corolla and calyx H corolla opened out to show stamens J ovary and style. Drawn by Eliana Calzadilla A-F, H-J from Wood et al. 25053; G from Wood et al. 27705 and photo.