Description
Ttufted, creeping, rhizomatous tuberous herbs; stem acutely 4-angular, scabrous-pubescent. Leaves opposite, 3-7.5 x 1-3.5 cm, oblong or oblong-lanceolate, semiamplexicaul or subcordate and adnate at base, coarsely serrate along margins, acute at apex, scabrous on both surfaces, lineate, rugose above; lateral nerves impressed above, raised distinct beneath; lateral ones excurrent into teeth. Spikes terminal, fasciculate, cylindric, dense; peduncles 1.5-3 cm long; bracts lanceolate, acute at apex, ca 10 x 2 mm, usually longer than calyx lobes, ciliate. Calyx oblong, oblique, 5-toothed, ca 6 x 1 mm, glandular-pubescent outside; teeth subequal, acute, ending in long subulate hairy tips. Corolla hypocrateriform, 5-lobed, pink, dark purple or blue-violet; lobes obovate, emarginate, ca 5 x 3 mm; tube narrow, cylindric, ca 1.5 x 1 mm, hairy at throat, glabrous below, pubescent above outside. Stamens 4, didynamous; filaments filiform, ca 1 mm long; anthers ovoid, ca 0.3 mm long, basifixed. Ovary oblong, ca 1 x 0.4 mm, 4-loculed; style 3-4 mm long, usually not surpassing calyx tube; stigma subcapitate, spurred at base. Schizocarps ca 4 x 2 mm, separating into 4 oblong cocci; cocci ca 2 x 1 mm, scabrous on commissural faces.
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