Convolvulus kossmatii Vierh., Denkschr. Akad., Wien, Math.-Naturwiss Kl. 71: 416. 1907. (Vierhapper 1907: 416)

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 : 132

106. Convolvulus kossmatii Vierh., Denkschr. Akad., Wien, Math.-Naturwiss Kl. 71: 416. 1907. (Vierhapper 1907: 416)

Breweria spinosa Vierh., Österr. Bot. Zeit. 54: 287. 1904. ( Vierhapper 1904: 287). Type. SOCOTRA, Abd al Kuri Island, Paulay s.n. (lectotype WU, designated by R.R. Mill in Sebsebe et al. 2009: 228).

Seddera spinosa (Vierh.) Verdc., Hooker’s Icon. Pl. 7(4): t. 3688.1971. ( Verdcourt 1971: 1-3). Type. Based on Breweria spinosa Vierh.

Type.

Based on Breweria spinosa Vierh.

Description.

Undershrub to 60 cm, branches fastigiate, sharply spinescent, sericeous when young but later glabrescent. Leaves subsessile, 4-12 × 1-1.5 mm, acute, entire, cuneate at the base, silvery pubescent. Flowers solitary, axillary, subsessile; peduncles absent; bracteoles 2-3 × 0.5 mm, oblong, acute; pedicels c. 1 mm; outer sepals 6 × 3 mm, ovate to elliptic, acute, pubescent on the margins; inner sepals c. 4 mm wide, subrhomboid with hyaline margins; corolla 10-11 mm long, white, midpetaline bands pubescent; filaments glandular basally; ovary glabrous, style glabrous, divided c. 8 mm above base; style arms 0 and 0.5 mm, unequal, stigmas subglobose. Capsule and seeds not known.

Distribution.

Endemic to Abd al Kuri Island in the Socotra group (Smith & Lavranos 645, Miller 11444).