Ipomoea lilloana 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

71. Ipomoea lilloana O'Donell , Lilloa 14: 182. 1948 ( O’Donell 1948a: 182)

Type.

ARGENTINA. Salta, Dept. Campo Santo, Juramento, C. O’Donell 4910 (lectotype LIL001253, designated here; isolectotypes LIL).

Description.

Trailing perennial herb, stems sparsely pubescent, somewhat stout and slightly fleshy, up to 2 m long, rootstock stout, often 10 × 10 cm or more, tuberous. Leaves petiolate, 3-7 cm, ovate-deltoid, ovate or suborbicular, obtuse to acute, base broadly cordate to subtruncate, the margin undulate to dentate, white-canescent when young but when mature adaxially dark green and glabrous, abaxially puberulent especially on the veins; petioles 1.5-3.5 cm, thinly pubescent. Inflorescence of shortly pedunculate 1-3-flowered cymes; peduncles 1-7.5 cm; bracteoles not known, fugacious; pedicels 5-10 mm; sepals slightly unequal, 8-10 × 6-7 mm at anthesis but accrescent to 13 mm in fruit, ovate-elliptic, pubescent, outer sepals subacute, inner sepals slightly longer, scarious-margined, obtuse to rounded, sometimes mucronate; corolla 4-7 cm long, funnel-shaped, pink, densely adpressed pilose, limb 5-6.5 cm diam., unlobed. Capsules 1.5 × 0.8 mm, ovoid, acute to rostrate, glabrous; seeds 9 × 4 mm, densely woolly.

Illustration: Figure 15D; O 'Donell (1959b: 175); Wood et al. (2015: 49, photo).

Distribution.

Inter-Andean dry valleys of northern Argentina and southern Bolivia between about 650 m and 2600 m in small, scattered populations on open stony or sandy slopes. ARGENTINA. Catamarca: Andalgalá, Cuesta de la Chilca, G.E. Barboza et al. s.n. [30/1/2008] (SI). Salta: Campo Santo, C. O’Donell 5509 (LIL); Virgilio Tedin, Peirano s.n. [20/11/1933] (GH, LIL).

BOLIVIA. Chuquisaca: Oropeza, near Chuquichuqui, J.R.I. Wood 10252 (HSB, K, LPB). Cochabamba: Campero, Lagar Pampa, J.R.I. Wood & M. Mendoza 21515 (BOLV, OXF, K, LPB, USZ); between Omereque and Totora, J.R.I. Wood & N.P. Taylor 22521 (K, LPB). Santa Cruz: Caballero, near Abra de Quine, M. Nee 46632 (NY, USZ). Tarija: Gran Chaco, between Palos Blancos and Yacuiba, J.R.I. Wood et al. 28322 (LPB, OXF, USZ); O’Connor, Río Pilaya, M. Serrano et al. 7114 (HSB).

Note.

Readily identified by its trailing habit, stout stem, thinly pubescent, undulate leaves, pubescent sepals and corolla. Although the leaves are variable in shape, there is no other similar species in the inter-Andean valleys.

Figures

Figure 15. Photographs of Ipomoea species. A-B I. setosa subsp. pavonii A fruit B flower C I. paludosa, subspicate inflorescence D I. lilloana, storage root E I. opulifolia, storage root, leaves and flower. A, B, D, E Maira Martinez; C Hector Keller.