单花唇柱苣苔 dan hua chun zhu ju tai

Perennials, stemless. Rhizome internodes inconspicuous. Leaves basal, opposite; petiole 2-7.5 cm X 0.6-2 mm; leaf blade elliptic to elliptic-ovate or elliptic-obovate, 4.5-13 X 2.3-6.5 cm, herbaceous, sparsely puberulent (hairs to 1.2 mm), eglandular, base oblique, rounded to subcordate, margin dentate to serrate, apex obtuse; lateral veins ca. 5 on each side of midrib, conspicuous. Cymes 1-flowered; peduncle 2-4 cm, sparsely pubescent; bracts absent or 2, free, narrowly linear, 2.5-3 X 0.3-0.5 mm, puberulent, margin entire, apex acute. Pedicel 1.3-3 cm, pubescent. Calyx 1.7-1.9 cm, 5-lobed; tube 5-10 mm; lobes equal, triangular-lanceolate, ca. 7 mm, outside sparsely puberulent, inside glabrous, margin entire, apex subulate-acuminate. Corolla purplish, 4.5-5.6 cm, glabrous; tube narrowly funnelform, 3-4 X 1-1.5 cm; adaxial lip ca. 1 cm; abaxial lip ca. 1.6 cm. Filaments ca. 9 mm, glandular puberulent near apex; anthers fused by entire adaxial surfaces, ca. 3 mm, glabrous; staminodes 2, ca. 6 mm. Pistil ca. 3.1 cm, sparsely glandular puberulent; ovary ca. 1.5 cm. Stigma flabellate, ca. 3 mm, 2-lobed. Fruit and seeds unknown. Fl. Jun-Jul.

* Forests, valley streamsides; 400-1600 m. NW Hunan (Sangzhi Xian, Yongshun Xian).

After publication of the family treatment for the Flora of China, this was treated as Henckelia monantha (W. T. Wang) D. J. Middleton & Mich. Möller (Taxon 60: 776. 2011).