Asystasia retrocarpa T.J.Edwards

Erect to decumbent perennial up to 350 mm tall, sparsely pilose to glabrous; stems angular, narrowly winged, well branched throughout Leaves oblanceolate to obovate, up to 50 X 18 mm; base attenuate, decurrent on petiole; apex acute to rounded; lamina amphistomatous, usually with sparse, sessile, glandular trichomes; margins and veins i usually sparsely pilose. Inflorescence a 2-to 5-flowered j helicoid cyme; peduncle glabrous or sparsely pilose; bracts narrowly lanceolate, up to 3 x 0.5 mm, bracteoles slightly smaller, abaxial surface sparsely covered with sessile glandular trichomes, adaxial surface with stalked glandular trichomes; pedicels densely retrorse-pilose, up to 2.5 mm and i straight in young flowers, up to 5 mm and reflexed in fruiting specimens. Calyx pentamerous, sepals free, narrowly lanceolate, 5.5-7.0 X 0.8 mm, outer surface sparsely and shortly pilose, inner surface with stalked glandular trichomes. Corolla outer surface with short glandular and coarse eglandular trichomes, inner surface hairy near the base, tube 6.0-7.5 mm long, bilabiate; upper lip 4.5-6.0 mm long, 2-lobed, lobes 1.5-2.0 mm long; lower lip 4.5-6.5 mm long, 3-lobed, with a well-developed palate, lateral lobes 2 x 1 mm, middle lobe 2.0 x 2.5 mm. Stamens inserted; anthers muticous, thecae 1.5 mm long, slightly divergent; filaments sparsely hairy. Pollen prolate, tri-colporate; stopples prominent, bipartite. Ovary glabrous, 2 mm long; style glabrous, 8.5-9.0 mm long; stigma bifid, upper lobe 1 mm long, lower lobe 0.75 mm long. Capsule glabrous, stipitate, slightly compressed, 16-19 x 4-5 mm. Seed strongly compressed, asymmetrically ovate, 5.0-5.5 x 2.5-3.5 mm, marginal ridge prominent, lateral faces with longitudinal ridges interspersed with tubercles.