Ipomoea oranensis 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

164. Ipomoea oranensis O'Donell , Lilloa 14: 185. 1948. ( O’Donell 1948a: 185)

Ipomoea santacruzensis O'Donell, Arq. Mus. Paranaense , Curitiba 9: 237. 1952. ( O’Donell 1952: 237). Type. BOLIVIA. Santa Cruz, Camiri, M. Cardenas 4258 (holotype LIL001282; isotype US).

Type.

ARGENTINA. Salta, Dept. Orán, San Andrés, Pierotti 280 (lectotype LIL001265, designated here).

Description.

Vigorous twining perennial, stems thinly to densely pubescent with stellate and simple hairs. Leaves petiolate, 4-15 × 2-9 cm, ovate-deltoid (rarely 3-lobed to half way), shortly acuminate and mucronate, base shallowly cordate to truncate and broadly cuneate onto the petiole, adaxially thinly pubescent, abaxially grey-tomentose; petioles 1-7 cm, tomentellous. Inflorescence of lax, axillary, often compound, pedunculate cymes; peduncles 3-11.5 cm, tomentose; bracteoles 5-10 mm, filiform, tomentose, caducous; secondary peduncles 1.5-2 cm; tertiary peduncles slightly shorter; pedicels 0.5-2 cm, pubescent to tomentose; sepals coriaceous, somewhat unequal, outer sepals 6-11 × 5-7 mm, elliptic, obtuse, convex, entirely glabrous or pubescent in the lower half only, margins scarious; inner sepals 7.5-12 mm, slightly broader and rounded; corolla 4.5-7 cm long, funnel-shaped, pink, glabrous, limb 4-5 cm diam., shallowly lobed; stamens and style included. Capsules 14-15 × 12-13 mm. suborbicular, glabrous; seeds 7 × 4 mm, long-pilose.

Illustration.

Figure 95 .

Distribution.

Serrano Chaqueño and Tucuman-Bolivian woodland between about 650 m and 2300 m extending along the eastern Andean slopes from just south of Santa Cruz through the Departments of Chuquisaca and Tarija to Orán in Argentina.

ARGENTINA. Salta: Only known from the type.

BOLIVIA. Chuquisaca: Azurduy, Tarvita, M. Jiménez & J. Villalobos 755 (MO, OXF); Boeto, below Nuevo Mundo, J.R.I. Wood et al. 20493 (BOLV, HSB. K. LPB); Siles, Serrania Los Milagros, M. Serrano et al. 6853 (OXF, MO); Tomina, Sopachuy, J.R.I. Wood 20458 (HSB, K, LPB); Zudañez, Mojocoya-Sacha Pampa, J.R.I. Wood & M. Serrano 13356 (HSB, K, LPB). Santa Cruz: Cordillera, Charagua, I. Vargas 474 (NY, USZ); Ibañez, Los Espejillos, G.A. Parada et al. 124 (OXF, MO); Vallegrande, G. A. Parada et al. 3191 (USZ). Tarija: O’Connor, Entre Ríos, M. Mendoza et al. 2860 (K, USZ).

Note.

Both indumentum and leaf shape vary considerably in this species as in the related Ipomoea bonariensis . Leaves are usually entire but 3-lobed forms occur occasionally.

I. oranensis has stellate hairs but they are never obvious as in I. bonariensis and are often difficult to find, most hairs being simple. Ipomoea oranensis is very similar to I. exserta and the two species are almost indistinguishable when not in flower. However, the funnel-shaped corolla of I. oranensis is totally different from the hypocrateriform corolla of I. exserta with its exserted stamens.

Figures

Figure 95. Ipomoea oranensis. A habit B adaxial leaf surface C abaxial leaf surface D corolla and calyx E calyx in fruit. Drawn by Eliana Calzadilla from Wood et al. 27639.