Convolvulus holosericeus M.Bieb., Fl. Taur.-Caucas. 1: 147. 1808. (Marschall von Bieberstein, 1808: 147).

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 : 164

153. Convolvulus holosericeus M.Bieb., Fl. Taur.-Caucas. 1: 147. 1808. (Marschall von Bieberstein, 1808: 147). Figure 20, t. 23-33

Type.

CRIMEA, Marschall von Bieberstein s.n. (holotype LE!; isotype BM!).

Description.

Undershrub with a thick woody taproot from which arise numerous short prostrate to weakly ascending stems to 30 cm forming a mat, vegetative parts all grey-sericeous. Leaves sessile, 2-4.5 × 0.2-0.6 cm, linear, oblong or oblanceolate, acute, entire, base long-attenuate.. Flowers in terminal cymose clusters, usually with single flowers or few-flowered, diachasia, subsessile or borne on peduncles up to 1.7 cm long from the axils of the uppermost leaves; bracts resembling the leaves but smaller, linear- oblong; bracteoles 3-6 × 0.5 mm, linear; pedicels 1-4 mm; outer sepals 10-15 × 5-12 mm, ovate to suborbicular, acuminate, gibbous with broad membranous wing-like margins; inner sepals slightly smaller; corolla 2-2.7 cm long, pale yellow or cream; unlobed but slightly undulate, midpetaline bands adpressed pilose; ovary pubescent, style pubescent, divided c. 7-8 mm above ovary, stigmas 5 mm. Capsule pubescent, seeds puberulent. [ Sa’ad 1967: 132; Parris 1978: 207]

Notes.

We recognise two subspecies based on sepal size, although intermediates are not uncommon.