B. obscuribracteata

Culture

Endangered Status

Endangered

Original Botanical Description or Link to

Herb, lithophytic, monoecious, rhizomatous. Rhizome creeping, c. 6 cm long, 3–4 mm in diam., internodes c. 2.5–6 mm long. Stipules persistent, triangular, c. 10 × 7 mm, shallowly keeled, margins entire, apex apiculate with tip c. 1 mm long, adaxially glabrous, abaxially white tomentose (hairs c. 2 mm long). Leaves alternate; petiole terete, maroon, white to red tomentose (hairs 0.5–3 mm), 2.5–6.9 cm long, 2–3 mm in diam.; lamina basixed, suborbicular to broadly ovate, asymmetrical, 6.2–7.6 × 6–6.5 cm, broadside 3.5–5.5 cm wide, base shallowly cordate to cordate, sinus sometimes overlapping slightly, apex rounded to acute, margins crenate, shallowly undulating, ciliate (hairs 0.5 mm long), non-glossy, adaxial surface citrine, red to white hirsute (hairs 1–2.5 mm long), abaxially red hirsute, trichomes slightly more concentrated on veins (hairs c. 0.5 mm long), venation palmate, c. 8 veins, abaxially raised, branching dichotomously or nearly so, tertiary veins reticulate. Inorescences axillary, protandrous, cymosely branching panicles, 7.3–8.4 cm long; peduncle 6.7–11 cm long, red, sparsely red pilose, branching up to 3 times. Bracts red, triangular-ovate, apex acute, caducous, red hirsute, margins mbriate; lowest bracts c. 2.5 × 1.5 mm. Staminate ower: pedicel 1.4–2.1 cm long, sparsely red hirsute; tepals 4, pale pink, outer 2 widely ovate to suborbicular, apex rounded, abaxially red hirsute (hairs 0.5–1 mm), 8–10 × 6–11 mm, inner 2 narrowly to broadly obovate, glabrous, apex slightly retuse, 9–10 × 3–5 mm; androecium zygomorphic, c. 4 mm wide, stamens 24–28, 2–2.5 mm long, laments free, anthers yellow, c. 1 mm long, oblong-elliptic, slits lateral, connective extended to apex and bluntly protruding. Pistillate ower: pedicel 1.6–1.8 cm long, sparsely red hirsute, tepals 4, pale pink, outer 2 widely ovate to orbicular, apex rounded, 7.5–11 × 7.5–11 mm, abaxially red hirsute (hairs 0.5–1 mm long), inner 2 narrowly to broadly obovate, apex rounded, 7–10 × 3–4.5 mm, glabrous; ovary pinkish red, sporadically and sparsely red hirsute (hairs 1–2.5 mm long), trigonous-ellipsoidal, locules 2, one bid placenta per locule, 6–7 mm long, 2–3 mm thick (wings excluded), wings 6, largest wing lunate, markedly cucullate, distally truncated, proximally rounded, margins red mbriate, c. 5 mm wide, lateral wings narrowly oblong, slightly increasing in width towards apex, distally bluntly truncated, margins mbriate, c. 2 mm wide, 2 wings running between the largest wing and the lateral wings, narrowly crescent-shaped, margins mbriate, c. 2 mm wide, a much narrower wing runs between the lateral wings, margins red mbriate, c. 1 mm wide; styles 3, shortly fused at base, c. 2.5 mm long; stigma spirally twisted and papillose all around. Fruit pendent, recurved such that the largest wing faces down, 2 lateral wings slightly cucullate, forming a splash cup; the sixth wing runs down the middle and divides the splash cups into 2 basins.