Convolvulus lilloi O'Donell , Lilloa 29: 293. 1959. ( O'Donell 1959: 285).

Wood, John R. I., Williams, Bethany R. M., Mitchell, Thomas C., Carine, Mark A., Harris, David J. & Scotland, Robert W., 2015, A foundation monograph of Convolvulus L. (Convolvulaceae), PhytoKeys 51, pp. 1-282 : 94

53. Convolvulus lilloi O'Donell, Lilloa 29: 293. 1959. ( O'Donell 1959: 285).

Type.

ARGENTINA, Corrientes, Ituzaingó, Meyer 5786 (holotype LIL!).

Description.

Densely pubescent or tomentose trailing or twining herb from a thickened rootstock, stems to at least 1 m long, relatively stout. Leaves petiolate, 2-7(-10) × 0.7-2.8 cm, lanceolate-oblong with pronounced basal auricles, these sometimes lobed, apex acute and mucronate, margin entire to weakly undulate, base hastate; petioles 3-10(-15) mm. Flowers solitary (very rarely paired), axillary, pedunculate; peduncles 2-5 cm; bracteoles 2-5 mm, linear-lanceolate; pedicels 10-15 mm; outer sepals 10-13 × 5-6.5 mm, elliptic, obtuse; corolla 2.5-4 cm long, white with dark centre, shallowly lobed, midpetaline bands pilose, extended into teeth; ovary glabrous, style glabrous, divided c. 16 mm above base, stigmas 2-3 mm, cylindrical. Capsule glabrous; seeds smooth to finely tuberculate. [ O’Donell 1959: 285-288 (Figure 46)]

Distribution.

Argentina: Corrientes and Misiones (Pedersen 1912, Ferraro 3094); Brazil: Rio Grande do Sul (Lindeman et al. 8417, Ferreira 110). 0-500 m.

Notes.

An apparently very distinctive local endemic characterised by its large, usually solitary flowers and densely hairy indumentum. However, a number of specimens indicate that it is more variable than O’Donell supposed. Ibarrola 1305 from Corrientes probably fits but the sepals are only 9 mm long and the corolla a mere 2.5 cm in length. Dusén 7310 and Smith & Kiela 7814 from southern Brazil appear to be intermediate with Convolvulus hasslerianus as the leaves are only very shortly petiolate.