Convolvulus ammannii Desr., Encycl. [Lamarck et al.] 3: 549. 1792. (Desrousseaux 1792: 549).

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 : 152

132. Convolvulus ammannii Desr., Encycl. [Lamarck et al.] 3: 549. 1792. (Desrousseaux 1792: 549).

Type.

RUSSIA, Siberia, Patrin (holotype P [Herb. Lam.]!).

Description.

Grey-sericeous perennial herb with thick woody taproot; stems short, decumbent or weakly ascending, more or less herbaceous, to 12 (-22) cm long. Leaves sessile, 0.7-3 × 0.15-0.5 mm, linear or linear-oblanceolate, obtuse, tapering at the base. Flowers pedunculate from the axils of leaf-like bracts or, rarely, terminal only; peduncles 0.4-2.2 cm, 1-flowered; bracteoles, 4-13 × 0.5 mm, linear; pedicels 1-6 mm, often bent or curved; outer sepals 4.5-6 × 2-2.5 mm, ovate, abruptly narrowed and drawn out to an obtuse apex, the inner sepals much broader, c. 7 × 4 mm; corolla 0.8-1.3 cm long, white or very pale pink, very obscurely lobed, midpetaline bands pilose, terminating in a blunt tooth; ovary and style pilose; style divided c. 3 mm above base, stigmas c. 3 mm long. Capsule pilose at apex only; seeds smooth, pubescent. Figure 17: 27-33.

Distribution.

Northern China and Manchuria (Sino-British Qinghai Expedition (1997) 1006, Rock 13233); Korea (?); Mongolia (Potanin s.n.. [18/8/1886], Pipe-Wolferstein & Phillips 37); Turkmenistan (Schipczinsky 341); Kazakhstan (Kossinsky 884, Karamisheva et al. 5872); Uzbekistan (Kutscherovskaya 426); Russia: Siberia (Timochina & Pashchenko 7544, Maltzev 3764a). Very common in southern Siberia.