Perennial or shrubby herb with trailing stems from a woody rootstock; stems to 45 cm long, brown, minutely sericeous-puberulous with upwardly directed hairs. Leaves uniformly minutely puberulous or sparsely so on both sides or denser along midrib, white-dotted when older; lamina elliptic to slightly obovate, largest 2-4 x 0.5-1.5 cm; margin with 1-4 small teeth per side or some entire. Spikes 2-4 cm long, 2-8-flowered; peduncle 5-13 mm long, with 3-4 pairs of gradually larger sterile bracts; fertile bracts greenish to brownish, without whitish veins, uniformly puberulous or sparsely so all over, elliptic-obovate or broadly so, lower and middle 17-28 x 8-15 mm of which the straight to slightly recurved triangular or broadly triangular spinose tip 6-11 mm, on each side with 3-6 teeth of which the longest 2-5 mm. Bracteoles lanceolate to narrowly oblong, 15-23 x 1.5-2 mm. Sepals minutely puberulous to puberulous, densest towards apex (ventral rarely also with pilose hairs), ciliate; dorsal 17-25 mm long, 5-veined from base, ovate with long spathulate apical part, apex truncate, wavy, irregularly toothed, apical part scarious; ventral 12-17 mm long, 5-veined from base, ovate-elliptic or oblong, ligulate or narrowing gradually to an apex which is truncate and un-toothed or which has two broad rounded or triangular non-mucronate teeth to 1.5 mm long; lateral ovate, 7-10 mm long. Corolla blue with darker veins, 24-30 mm long of which the tube 5-7 mm; limb spathulate, 15-20 mm wide, central lobe wider than long or same width, truncate or slightly retuse, narrowed at base; filaments 7-9 mm long, glabrous to sparsely glandular (densest downwards); appendage 2-4 mm long, oblong, rounded, shorter than anther; anthers 3.5-5 mm long. Capsule 11-13 mm long; seed not seen.
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Perennial or shrubby herb; with trailing stems from woody rootstock, stems up to 450 mm long. Close to B. sinuata but dorsal sepal 17-25 mm long, 5-veined from base, apical part spathulate. Corolla limb truncate or slightly retuse.