Low sprawling shrub. Stems sprawling, glabrous, terete, reddish brown; branchlets ascending. Lvs dull dark green, not papillate, 3-angled with ± sharp margins and blunt keel, linear, acute, not tapered to shortly connate lf-base, 30-90 × 4-5 mm, 5-6 mm thick; keel smooth throughout. Fls 5-7 in terminal cymes, 50-60 mm diam. Calyx glabrous; sepals 14-18 mm long. Petals spreading, bright purple above, paler with median stripe beneath, 20-30 mm long. Stamens 4-6 mm long; filaments bright purple with hairy bases; anthers pale yellow. Capsule c. 1 cm diam. Seeds brown, obovoid, rugose, c. 1.5 mm long.