Aspidistra semiaperta Aver. & Tillich–Nordic J. Bot. 33(3): 373. (2014).
Vietnam, Hoa Binh prov., Lac Son distr., Tu Do municipality, Mon village, around point 20°25′29′′ N, 105°19′36′′ E. Flowered under cultivation, Nov–Jan 2014, L. Averyanov, P. Efimov, CPC 1566b/sp.9 (holotype: LE, isotype: LE).
Paratype: Vietnam, Hoa Binh Prov., Lac Son Distr., Tu Do Municipality, Mon village, around point 20°25′29′′ N, 105°19′36′′ E. Primary broad-leaved forest on steep rocky slopes of remnant mountain composed of solid crystalline highly eroded limestone at elevation about 500–700 m a.s.l., 25 Mar 2011, L. Averyanov, L. Osinovetz, T. Maisak et al., CPC 1566b (LE).
Vietnam: Hoa Binh province.
Flowers in November–January in cultivation.
Rhizome terete, epigeous to hypogeous, creeping, plagiotropic, much branched; branches 7–10(12) mm in diameter, 5–10(15) cm long, densely nodal, covered by dissected papyraceous remains of cataphylls, with many distant erect leaves. Cataphylls convolute, linear to narrowly cuneate, dark chestnut brown, 5–15 cm long. Leaves numerous, throughout apical parts of rhizomes, indistinctly distichous, petiolate, internodes 5–10 mm long. Petiole slender, erect, straight, to 50 cm long. Leaf blade upright to almost horizontal, ovate to elliptic, cuneate at base, shortly attenuate at apex, (14)17–28(32) cm long, (4)6–8(10) cm wide, uniformly dark glossy green, plicate, with prominent midvein on lower surface and (1)2(3) inconspicuous secondary veins at both sides. Flowers odorless, solitary, shortly pedunculate. Peduncle dirty purple–violet, (6)8–10(12) mm long, 2.0–2.5 mm in diameter, with 2–3(4) scattered and 1–2 bracts at base of perigone; lower bracts broadly ovate, papyraceous, white with fine irregular dirty–purple markings, blunt to obtuse at apex, 5–8(10) mm long and wide, the distal bracts adpressed to perigone, broadly triangular-ovate, concave, 5–8(10) mm long, 5–10(12) mm wide, often splitting longitudinally into 2–3 lobes. Perigone tube depressed urceolate, 10–15(16) mm in diameter, (4)5–6(7) mm tall, finely verruculose, purple–brown or dark purple–violet to almost black on both surfaces, with 6 lobes. Perigone lobes subsimilar, triangular, blunt to obtuse at apex, fleshy, with narrow scarious margin, rugose or finely verruculose, straight erect or with approaching tips, 4–5(6) mm long, (4.0)5.0 – 6.0(6.5) mm wide, each inside with 2 ridge-like fleshy roughly papillose keels running down to the middle of perigone tube. Stamens 6; anthers sessile, flat, broadly ovate, cordate at base, 1.8–2.2 mm long, 1.4–1.6 mm wide, adpressed to the base of perigone tube, horizontally spreading with pollen sacs oriented upwards; pollen bright yellow. Pistil mushroom-shaped, with peltate stigma; ovary inconspicuous; style stout, white with many dirty purple marks, shortly obpyramidal, broadening to the apex from the base, 1.5–2.5(3.0) mm tall, 2.5–3.0 mm in diameter. Stigma large, fl eshy, hexagonal, (9)10–12(14) mm in diameter, indistinctly 6-lobed, white with dark purple–violet margin, upwards incurved at sinuses of stigma lobes, upper surface flat, papillose, with dirty purple–violet irregular palmate markings.
Averyanov L.V. & Tillich H.J. (2014) Nordic J. Bot. 33(3): 366–376.