Convolvulus gracillimus Rech.f., Anz. Oesterr . Akad. Wiss., Math.-Naturwiss. Kl 92: 274. 1955. (Rechinger 1955: 274).

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 : 150-151

130. Convolvulus gracillimus Rech.f., Anz. Oesterr. Akad. Wiss., Math.-Naturwiss. Kl 92: 274. 1955. (Rechinger 1955: 274). Figure 17, t. 8-14

Type.

IRAN, Tehran, Koelz 16080 (holotype W!; isotypes E!, US).

Description.

Slender, sericeous, rigid undershrub of grey appearance to c. 30 cm with numerous erect stems and very rigid branches arising at c. 60°. Leaves sessile, 0.8-2.8 × 0.2-0.3 cm, linear to oblanceolate, acute, entire, decurrent at the base. Inflorescence of solitary pedunculate flowers, becoming somewhat dichasial cymose apically; bracts oblong, caducous; peduncles 5-20 mm, slender; bracteoles minute, scale-like; pedicels 3-7 mm, curved; sepals 2 × 2 mm, suborbicular to broadly elliptic, obtuse, the outer ones pubescent, the inner glabrous, membranous, mucronate; corolla 0.6 cm long, white, midpetaline bands pilose; ovary pilose, style pilose, divided 1 mm above base, stigmas 2 mm. Capsule and seeds not seen. [ Sa’ad 1967: 109; Rechinger 1963: 25 (plate)]

Distribution.

Iran. Only known from the type collection.

Notes.

The tiny sepals and corolla and the very rigid grey stems are characteristic.