Description
Gregarious undershrubs, up to 2 m tall, usually erect, rarely scandent, branching usually from older parts; nodes with a pair of spines at the base of the petiole; stilt-roots arising from lower portion of stem. Leaves opposite-decussate, simple, 7-15 x 6-9 cm, variously shaped, elliptic, ovate-oblong, or ovate- lanceolate, narrowed at base, spinous at apex, glabrous, coriaceous, sinuately lobed and spinulose along margins, rarely entire; midrib prominent, lateral veins 4-12 pairs, estipulate; petiole usually 0.5-1 cm and rarely up to 2.5 cm long, terete. Flowers in terminal or pseudo-axillary, 8-20 cm long spikes; peduncle terete, glabrous. Flowers sessile, 3.5-x 3.5 cm across; bract 0.6-0.8 x 0.5 cm, ovate, acute, margin ciliate; bracteoles 2, conspicuous, partly covered by the bract, lanceolate, persistent. Calyx green, 4-partite, lobes glabrous, 12-15 x 1 mm, shortly connate in two opposite pairs, the outer pair larger. Corolla bluish-violet, 3 cm long with a short tube closed by basal hairs; upper lip obsolete, lower lip broadly 3-lobed to entire, recurved by the middle portion. Stamens 4, attached to the throat of corolla tube, didynamous; filaments 13-16 mm long, stout, curved, more or less flat; anthers aggregated around the style, c. 1.2 cm long, connectives thickly hairy, medifixed, bilobed, one lobe sterile, dehiscing longitudinally. Ovary 2-loculed; ovules 2 in each locule on axile placenta; style c. 2.7 cm long, slender, terete; stigma bifid. Capsule, ellipsoid or ovoid-oblong, glabrous, 3-3.5 x 1.3-1.6 cm, apiculate; seeds 4, compressed, orbicular, 1.3-1.5 x 1- 1.2 cm, supported on short-hooked retinacula.
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