Scientific name: Bidupia khangii Aver.English name: Vietnamese name: Lan bì đúp khangOther name:
Perennial sympodial terrestrial creeping herb. Plagiotropic stem dull brownish-pink, epigeous, leafless, fleshy, rooting at nodes, to 16 cm long, 4–6 mm in diam.; floriferous stem erect, to (18)20–24(28) cm, at the base with (3)4(5) closely spaced, spirally arranged leaves, terminated by lax spike. Leaves shortly petiolate; petiole and sheath (1)1.5–3(3.5) cm long, (3)4–5(6) mm wide; leaf blade narrowly ovate to ovate, slightly oblique, irregularly undulate along margin, with 1 main vein, acute, (5)6– 8(9) cm long, (1.6)2–3(3.4) cm wide, dark velvety olive-brown with white median stripe above, uniform glossy pale pink-brownish below. Scape and rachis straight, hairy with short soft hairs; scape with (3)2(1) sterile tubular, broadly lanceolate, obtuse bracts (0.6)1– 1.8(2) cm long, (4)5–6(7) mm wide (when flat); rachis (5)6–8(10) cm long, with (12)14–16(20) spirally arranged flowers, spaced on (4)5–6(8) mm. Floral bracts reddish-brown, outside sparsely hairy, triangular broadly lanceolate, tubular-convolute, obtuse, (6)8– 10(12) cm long, (3)3.5–4(4.5) mm (when flat), scarious, entire. Ovary glabrous, narrowly conoid, dull reddish– brown, (8)9–11(12) mm long, (2)2.2–2.8(3) mm in diameter near the base, narrowing to the apex, twisted on 180°, placed almost perpendicular to the rachis. Flowers sessile, widely opening, (0.6)0.8–19(1.2) cm in diameter; sepals pale brownish-pink or brown-greenish; petals white at the base, olive-brownish in apical part; lip white, spur reddish-brown, claw white; column reddish-brown, anther cap dull yellowish. Sepals free, with no distinct veins, subglabrous; median sepal narrowly ovate, concave, straight, erect, slightly attenuate and acute, (5.8)6–7(7.2) mm long, (2.5)2.6– 2.8(3.1) mm wide; lateral sepals oblong ovate, (8.4)8.6–9(9.2) mm long, (3.4)3.6–3.8(4) mm wide, more or less flat, horizontally or upward spreading, somewhat twisted at the base, with acute falcate apex. Petals little longer than median sepal, (2.3)2.4–2.6(2.7) mm wide, glabrous, straight, strongly oblique, narrowing from broad, strongly oblique base to acuminate, falcate, acute apex, 1-veined, connivent and forming narrow hood with the dorsal sepal. Lip glabrous, trilobed, spurred, clawed, apically 2-lobuled, about 5 mm long, distinctly divided into hypochile, mesochile (claw) and epichile. Hypochile rudimentary, in form of small rectangular concave hollow 2.8–3.0 mm long, 2.5–2.7 mm wide, closed by flat, triangular side lobes firmly adpressed to each other. Mesochile (claw) in form of short subterete, straight or slightly incurved tube, (1.4)1.5–2(2.2) mm long, 0.1–1.2 mm in diameter, grooved adaxially. Epichile in form of 2-lobuled plate, placed at the apex of mesochile; lobules adaxially spreading, broadly obovate to almost circular, (3.8)4–4.2(4.3) mm long and wide, finely denticulate and round apex, joined to each other by a small down recurved neck. Spur small, hemispheric, (2.7)2.8–3(3.1) long and wide, inside with low longitudinal keel rising near apex of hypochile into prominent flat dent 1.0–1.2 mm tall, outside longitudinally shallowly grooved and obscurely notched at apex, inside with 2 massive, fleshy, stalked, discoid glands 1.6–1.8 mm tall and wide. Column shortly cylindrical, (2.4)2.6–2.8(3.4) mm tall and broad; in basal half at front with 2 large lamellate keels, 2.8–3 mm long, 1.8–2 mm tall and 0.8–1 mm wide, each divided distally into 2 small denticulate diverging plates; stigma in form of 2 hardly connected lobes, placed at front of column, each lobe convex, almost circular, glossy orange-brown; rostellum prominent, narrowly triangular, longitudinally concave, forward directed, straight or slightly curved, 1.4–1.6 mm long; anther cap obovoid, (2.6)2.8–3(3.2)mm long, (1.3)1.4– 1.6(1.7) mm wide, with narrowly triangular, straight or slightly curved, conduplicate, beak; viscidium lanceolate, 1.0–1.4 mm long, whitish. Pollinia 2, white, stalked, clavate, secund, sectile, (2.7)2.8–3(3.1) mm long, each consisting of 2 hemipollinaria, 0.4–0.5 mm in diameter.
Species is named after it’s discoverer – Dr. Khang Sinh Nguyen.
Habitat, phenology and conservation status
Creeping terrestrial herb. Primary broad-leaved and coniferous evergreen humid forests (with Cunninghamia konishii) on sandstone and shale, commonly on rich soils in shady places of steep slopes. 1100–2000 m. Fl. June–August.
Estimated IUCN Red List status - DD.
Vietnam provinces: Ha Giang (Bac Me district), Nghe An (Phu Xai Lai Leng Mountains) and Tuyen Quang (Na Hang district).