B. serianensis

Culture

Endangered Status

Data deficient

Original Botanical Description or Link to

http://tai2.ntu.edu.tw/taiwania/pdf/tai.2017.62.105.pdf: Plant monoecious, lithophytic, perennial. Rhizome olive green to reddish, creeping and rooting at nodes, 4–10 cm long, 5–10 mm thick, velutinous, glabrescent, internodes congested. Stipules persistent, pale green to tinged reddish, narrowly triangular to ovate-triangular, acuminate at tip, 6–9 mm long, 3–5.5 mm wide, abaxially appressed puberulous, keeled, margin entire, apex long-setose, seta 5–6 mm long. Petioles terete, 2.5–5 cm long on upper stem, to 10 cm on lower stem, 4–6 mm thick, reddish, densely woolly, glabrescent. Leaves nearly appressed to substrate and assuming a rosette appearance, 3–10, slightly asymmetric, lamina orbicular to reniform, peltate, subpeltate to basifixed, 7–13 cm long, 7–13.5 cm wide, broad side to 8 cm wide, margin entire to denticulate, reflexed, villous, apex rounded, adaxially green to pale green, slightly bullate between palmate veins, glabrous, succulent, abaxially pale to reddish, villous on veins, midrib distinguishable, 6.5–12.5 cm long, with ca. 2 major lateral veins on each side, other primary veins branching dichotomously or nearly so, tertiary veins reticulate; all venation prominently raised abaxially. Bract pale yellowish green to pinkish, glabrous or minutely puberulous and with sessile glands adaxially, caducous; those at base of inflorescence ovate-triangular, ca. 3 mm long, ca. 2.5 mm wide, margin entire, apex setose, seta ca. 1 mm long, those at apex of inflorescence widely triangilar, 0.8–2 mm long, 1–2.3 mm wide, margin entire, apex attenuate. Inflorescence bisexual, in cymosely branching panicles, 1–4 arising from nodes on rhizome, pale green to reddish, sparsely villous, 4.5–14 cm long, peduncle 2.8–11 cm long; protandrous. Staminate flower: pedicel 4–12 mm long, sparsely villous, tepals 4, pale pink to white, abaxially glabrous or sparsely velutinous, margin entire, outer two widely elliptic to widely obovate, 7–11 mm long, 6.5–9 mm wide, apex acute to obtuse, inner two narrowly elliptic to widely oblanceolate, 6–9 mm long, 2–3 mm wide; androecium zygomorphic, stamens 25–35, filaments slightly fused at base; anther ca. 1.5 mm long, subequal to filament. Pistillate flower: pedicel ca. 5 mm long, glabrous or velutinous; ovary reddish to pale yellow green, glabrous or sparsely glandular; ovary body trigonous-ellipsoid, 3–5.5 mm across, 3-winged; wings subequal, reddish, triangular to narrowly crescent-shaped, rounded at tip, narrowed to base, sometimes not confluent at apex, 4–6.5 mm long, 1–2 mm wide; ovary 3-locular, placenta undivided; tepals 5, pinkish to white, abaxially glabrous or sparsely velutinous, outer 2 tepals ovate to elliptic, 8–11 mm long, 4–5.5 mm wide, inner tepals 3, oblanceolate to narrowly elliptic, apex acute, 6.5–12 mm long, 2–4 mm wide; styles 3, yellow, bifid, ca. 3.5 mm long, C-shaped and apically slightly split; stigmas in a spiral band and papillose all around. Fruit pendent on a stalk ca. 6 mm long, capsule 5.5–7.5 mm long, 6–8.5 mm thick (wings included), wings subequal, narrowed to the base, rounded distally.