Aspidistra sinuata Aver. & Tillich – Nordic J. Bot. 36(7)-e01833: 14. (2018).
Vietnam, 10 Oct 2017, L. Averyanov, T. Maisak, CPC 5470a (holotype: LE), type specimen prepared from living plant collected in Cao Bang province, Thong Nong district, Yen Son municipality, Nhieu Lung village, around point 22°46ʹ07.9ʹʹN, 105°53ʹ59.4ʹʹE, primary fractionally logged coniferous forest with Pseudotsuga sinensis along highly eroded rocky limestone ridge at 1150–1250 m a.s.l., terrestrial herb with short creeping rhizome in shady humid place in rocky valley, flower buds dirty dark purple-green, occasional, 8 Oct 2013, L. Averyanov, N. T. Hiep, L. M. Tuan, N. S. Khang, T. Maisak, L. Osinovets, CPC 5470.
Vietnam: Cao Bang province.
Flowers in October–November in nature.
Terrestrial perennial herb with short, thick, hypogeous simple, creeping rhizome (2)3–4(5) cm long bearing many roots; rhizome consisting of few sympodial plagiotropic segments, each 0.5–1.0(1.5) cm long and (4)5–6(7) mm in diameter, terminated by erect, strongly abbreviated stems 4–5 mm tall, bearing several cataphylls and tufts of (1)2–3(4) erect leaves. Cataphylls during anthesis herbaceous, cuneate, pale greenish, early withered, becoming light to dark brown, papyraceous or coriaceous, straight, upright, (3)4–12(15) cm long, (4)6–8(10) mm wide (when flattened out), broadening at base. Leaves suberect at the base, arching in apical half, leathery, narrowly lanceolate to linear, (18)22–40(50) cm long, (0.6)0.8–1.0(1.2) cm wide, conduplicate, tapering to an acute apex and narrow petiole-like base, straight along margin, uniformly dark grassy green, with prominent median vein and many indistinct secondary veins; petiole-like basal part subterete, adaxially grooved, (2.0)2.5–3.0(4.0) mm in diameter, prominently broadening at the base. Flowers 1(2), arising laterally from leafy part of the stem in apical rhizome segment, pedunculate, horizontally directed, fleshy, widely opening, (1.8)2.0–2.2(2.4) cm in diameter. Peduncle erect and arching becoming horizontal, (6)8–10(12) cm long, (3.8)4.0(4.2) mm in diameter, green, sometime finely speckled with purple, with 3(4) sterile bracts aggregated near flower base; sterile bracts scarious, white, speckled with purple, broadly ovate to almost rounded, often split at apex, with broad base enveloping peduncle, (5.5)6.5–10(12) mm long, (5)6–9(11) mm wide (being flattened). Perigone tube with 6 free lobes, widely campanulate to slightly urceolate, fleshy, 10–13 mm wide, 8–9 mm tall, dull pale yellowish-green heavily speckled dirty purple-violet outside, dark purple-violet inside, adaxially rough to finely verruculose, each segment with two strongly protruding ribs running from base of lobes half way down to middle of tube. Perigone lobes subequal, fleshy, recurved, spreading, straight, slightly longitudinally convex to almost flat, narrowly triangular ovate, (7.2)7.5– 8.0(8.4) cm long, (5.2)6.0–7.0(7.4) cm wide, obtuse to roundish at apex, pale yellowish-green with purple-violet speckles becoming increasingly dense towards base. Stamens 6, filamentose, placed at the middle of syntepalous part of perigone, in a deep groove behind each stamen formed by the ribs longitudinally running at inner perigone wall; filaments white, fleshy, shortly cylindrical, suberect, (1.5)1.6–1.8(2.0) mm long, 1.8–2.0 mm in diameter; anthers oriented parallel to perigone wall and style, introrse, bean-shaped, (3.3)3.5– 4.0(4.2) mm long, (2.0)2.2–2.5(2.6) mm wide, well distant from each other; pollen pale yellow; filaments at the base continued down with low white, fleshy ridges. Pistil erect, (6.0)6.5–7.0(7.5) mm tall; style fleshy, light green to almost white with light greenish tint, cylindrical, slightly broadening to the base, (3.2)3.4–3.6(3.8) mm long, (2.2)2.4–2.6(2.8) mm in diameter at base; stigma fleshy, obconic, (3.5)3.6–3.8(3.8) mm tall, below smooth and white with fine purple streaks, apical part almost flat and glossy white, hexagonal, (5.0)5.4–6.8(7.4) mm in diameter, with dark purple-violet straight margin and 3 purple speckled radial stripes running from middle of lobes about half way to the center. Ovary inconspicuous, very indistinct, light greenish. Fruits unknown.
Averyanov et al. (2018) – Nordic Journal of Botany: e01833.