3. Opithandra acaulis (Merrill) B. L. Burtt, Notes Roy. Bot. Gard. Edinburgh. 22: 303. 1958.
小花后蕊苣苔 xiao hua hou rui ju tai
Chirita acaulis Merrill, Lingnan Sci. J. 13: 47. 1934.
Petiole 1-3 cm, densely brownish villous; leaf blade ovate to narrowly ovate, 1.7-7 X 1.1-3 cm, papery, nearly flat, adaxially densely brownish puberulent, abaxially sparsely puberulent, base broadly cuneate to rounded, margin denticulate, apex acute to obtuse; lateral veins 4 or 5 on each side of midrib. Peduncle ca. 9 cm, brownish pubescent; bracts subulate. Calyx 5-sect from base; segments narrowly triangular, ca. 2 X 0.9 mm, apex acute to obtuse. Corolla pink, 7-10 mm, outside sparsely puberulent, inside glabrous; tube nearly tubular, not swollen, 6-8 X ca. 3 mm; adaxial lip ca. 1 mm; abaxial lip ca. 2.8 mm, all lobes entire. Stamens adnate to corolla ca. 2 mm above base, ca. 3.7 mm; filaments sparsely puberulent; anthers coherent at apex, oblong ovoid, dehiscing from straight slits; staminodes 3, adaxial 1 ca. 2 mm, abaxial 2 ca. 3.2 mm. Pistil exserted, ca. 1.4 cm; ovary puberulent. Style ca. 7 mm, glabrous; stigma 1. Fruit unknown. Fl. Apr.
* Shaded areas in montane regions. Guangdong (Zengcheng Xian).