Lobelia roughii Hook.F.

Glab. herb with pale yellow acrid sap. Roots ∞, rather stout, far-spreading; stems and branches tough, ascending through rock-debris; branchlets appearing above surface, up to ± 10 cm. long. Lvs thick, coriac., on broad flat petioles ± 5 mm. long. Lamina ± 10-20-(25) × 10-15-(20) mm.; obovate to broad-oblong to elliptic in outline, cuneately narrowed to base; coarsely, deeply dentate; teeth very narrow-triangular, blunt, elongating to ± 6 mm. Fls ± 10 mm. long, on stout peduncles up to 5 cm. long. Calyx 5-7 mm. long, persistent; lobes linear, thick, obtuse, elongating to c. 8 mm. in fr. Corolla white, hardly > calyx, split to near base into 2 lips; upper lip with 2 narrow segs, lower 3-lobed to c. ⅓ way; anthers not awned. Capsule coriac., ± 10-12 mm. long, broad-obovoid to suborbicular.