A new variety, Justicia vagabunda Benoist var. laxiflora K. Yamaz. & Tagane (Acanthaceae), discovered during botanical surveys in Bolaven Plateau, southern Laos, is described and illustrated. Variety laxiflora is distinguished from var. vagabunda by its longer petiole (0.1–)0.5–3 cm long, longer and laxer inflorescence to 15.3 cm long, more-flowered inflorescence (inflorescence with 7–50 flowers) and larger capsules ca. 2.7 cm long.
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