2. Gymnostachyum listeri Prain, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 69: 171. 1900.
云南裸柱草 yun nan luo zhu cao
Cryptophragmium tonkinense Benoist; Parajusticia petelotii Benoist.
Herbs to 50 cm tall, caulescent, isophyllous. Stems branched, 4-angled, pubescent. Leaves cauline; petiole 5-12 mm, pubescent; leaf blade elliptic to obovate-elliptic, (4.5-)6-13(-17) × 2.1-5.5 cm, abaxially white pubescent, adaxially glabrous except for trichomes along midvein, secondary veins 11-14 on each side of midvein and abaxially prominently curved, tertiary veins inconspicuous, base asymmetric or symmetric and ± decurrent onto petiole, margin entire or obscurely sinuate, apex acute to acuminate. Spikes 2-6 cm, secund; peduncle 0.5-1.5 cm; rachis pubescent and gland-tipped pilose; bracts linear, ca. 3 × 0.3 mm, pubescent; bracteoles linear-triangular, ca. 1.5 × 0.5 mm, pubescent. Calyx 0.1-1.1 cm; lobes linear, 8-10 × ca. 0.5 mm, outside pubescent, inside glabrous, margin gland-tipped pilose. Corolla purple, 1.6-2 cm, pubescent; tube basally cylindric and ca. 2.5 cm wide for ca. 8 mm, throat abruptly bending and widening to 5 mm; lower lip 4-5 mm, 3-lobed, lobes oblong and ca. 3 × 1.5 mm; upper lip 3-4 mm, 2-lobed, lobes broadly ovate and ca. 2 × 2 mm. Staminal filaments ca. 4 mm, glabrous; anther thecae oblong, ca. 5 × 1 mm, pilose, spurred at base. Ovary ca. 3 × 1 mm, glabrous; style ca. 1.5 cm, villous. Capsule not seen. Fl. Apr-May.
Limestone hills; 200-600 m. Guangxi, Yunnan [Bangladesh, Vietnam].