Trigonotis laxa I. M. Johnst.

Herbs perennial, with thin rhizomes. Stems erect to obliquely spreading, to 45 cm tall, sparsely short strigose; branches few and widely spaced or not branched. Petiole 0.3-7 cm; leaf blade elliptic to broadly lanceolate, 2.5-8 × 1-3.5 cm, abaxially sparsely short strigose, adaxially sparsely short strigose near apex, base rounded, decurrent into a narrowly winged petiole, apex rounded to obtuse, mucronate; midvein prominent, lateral veins obscure. Inflorescences terminal or from upper leaf axils, to 10 cm in fruit, sparsely short strigose, ebracteate. Pedicel 3-4 mm. Calyx lobes obovate, ca. 2 mm, slightly enlarged in fruit, short strigose, apex obtuse. Corolla light blue; tube ca. 1.5 mm, apex slightly expanded, ca. 2 mm wide; throat appendages ca. 0.5 mm, apex retuse; limb 4-5 mm wide; lobes suborbicular, ca. 2 mm wide. Stamens inserted at middle of corolla tube; anthers ca. 0.4 mm. Mature nutlets brown, inverted subulate, trigonous-tetrahedral, ca. 1 mm, together fastigiate, glabrous, shiny, adaxial 3 surfaces subequal in size; abaxial surfaces triangular-ovate, narrowly 3-winged on ribs, apex acute, sessile. Fl. May-Jun, fr. Jun-Jul.

Guizhou, Hunan, Jiangxi, Sichuan, Yunnan

* Forest, forest margins, thickets, ravines, stream banks, mountain roadsides and valleys; 500-1600 m.