Convolvulus argillicola Pilg., Bot. Jahrb. Syst. 48: 348. 1912. (Pilger 1912: 348).

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 : 73-74

31. Convolvulus argillicola Pilg., Bot. Jahrb. Syst. 48: 348. 1912. (Pilger 1912: 348). Figure 6, t. 32-40

Type.

NAMIBIA, Dinter 1892 & 2153 (syntypes B†, SAM).

Description.

Densely hispid-pilose perennial with prostrate/trailing stems from a central taproot to 70 cm; hairs rusty-brown in colour. Leaves petiolate, 1-3.5 (-5) × 0.5-2.5 cm, ovate in outline, deeply pinnatisect, abruptly narrowed and cuneate onto the petiole; petioles 1-8 mm. Flowers 1-2, axillary, subsessile; peduncles to c. 0.3 cm; pedicels 0; bracts filiform, 5-9 × 0.5 mm; outer sepals broadly ovate with a long caudate apex, c. 7-8 mm at anthesis, accrescent to 12-13 mm, becoming somewhat scarious, the margin crisped; corolla 10-12 mm long, deeply lobed for c. 4 mm, nearly concealed by calyx, white with pilose midpetaline bands; ovary glabrous, divided c. 4 mm above base; stigmas 2 mm, linear. Capsule glabrous; seeds glabrous, rugose. [ Meeuse 1958: 670; Meeuse and Welman 2000: 37 (map)]

Distribution.

Namibia (Seydel 3695, 4170, Merxmuller 1032, Pearson 9562, Dinter 4284). 1500-2000 m. Acacia bushland on sand; apparently rare.

Notes.

Very distinct because of the subsessile flowers and accrescent calyx, which almost conceals the corolla.