Convolvulus argyracanthus Rech.f., Aellen & Esfand., Anz. Oesterr . Akad. Wiss., Math.-Naturwiss. Kl. 87: 303. 1950. (Rechinger et al. 1950: 303).

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 : 157-158

141. Convolvulus argyracanthus Rech.f., Aellen & Esfand., Anz. Oesterr. Akad. Wiss., Math.-Naturwiss. Kl. 87: 303. 1950. (Rechinger et al. 1950: 303). Figure 18, t. 34-41

Type.

Iran, K.H. Rechinger et al. 3228 (holotype W!; isotypes E!, G, K!).

Description.

Grey spiny undershrub to 60 cm, stems grey-sericeous, spinescent, lateral spines formed from dead peduncles present near branch tips. Leaves sessile, 1-1.7 × 0.3-0.6 cm, obtuse, margin entire, base attenuate, grey-sericeous. Flowers solitary (or, fide Sa’ad (1967), 2-3 in axillary diachasia), axillary, pedunculate; bracts leaf-like; peduncles 3-4 mm, woody; bracteoles c. 1.5 mm, linear, obtuse; pedicels 1.2 mm long, bent at an angle to the peduncle; sepals all similar, 3-6 × 2-4 mm, obovate, mucronulate, abruptly narrowed at base, adpressed-pilose; corolla 1.6-2.2 cm, white with slight bluish flush, weakly lobed, midpetaline bands pilose; ovary pilose, style pubescent, divided c. 7 mm above base, stigmas 3 mm; capsule and seed not known. [ Sa’ad 1967: 63; Rechinger 1963: f. 2]

Distribution.

Iran: Kerman, Fars (Davis & Bokhari 56223, Grey-Wilson & Hewer 301, Popov 51/75, Foroughi 10731).

Notes.

Resembles Convolvulus spinosus but most easily distinguished by the obovate leaves and all five sepals equal in size and shape.