Begonia sinensis A. DC.
Plant epipetric; deciduous; with tubers from which upright stems arise, monoecious.
Tubers subglobose, to 20 mm across.
Stems 6-50 cm long, to 8 mm across, glaborus.
Stolons to 15 cm long, 4 mm across.
Stipules caducous, ovate, apex acuminate, margins serrate, to 16 mm long, 10 mm wide, glabrous.
Leaves many, basal and cauline, herbaceous, asymmetric, ovate, shallowly lobed, divided to 1/3 of leaf length at most, apex subacute to acuminate, base cordate, margins irregularly serrate, to 27 cm long, 18 cm wide, remotely minutely scaberulous adaxially, lobes (number), (shape), apex (shape); venation palmate; petioles to 16 cm long, 5.5 mm across, glabrous.
Inflorescences arise from stem, 6-30 cm long, glabrous; peduncles (inflorescence axis) to 17 cm long, 4 mm across, erect to pendent.
Bracts pinkish, caducous, narrowly ovate to rotund, apex acute, margins serrate, to 13 mm long, 10 mm wide, glabrous.
Flowers of both sexes pinkish, glabrouos.
Staminate flowers: tepals 2, cordate to orbiculate, 12-22 mm long, 13-20 mm wide; androecium actinomorphic / zygomorhpic; stemans 20-37, golf-club shape, yellow, filaments free, 2-3 mm long; anthers obovoid, 1.2-1.6 mm long, 1.0-1.1 mm across.
Pistillate flowers: tepals 2(-3), rotund to orbicular, 12-19 mm long, 11-19 mm wide; ovary pinkish when blooming, inferior, glabrous; styles 3, yellow, free, forked once, 4.6-5.4 mm long; stigmasin a band and spiraled.
Fruits capsular, dehiscence, pendent, trigonous, subequally or equally 3-winged, wings nearly triangular, obtuse at apex, to 19 mm long, 20 mm wide; locules 3, axile placentation, placental branches 2 per locule.
TAICHUNG: Chunghsingling-Takeng Peng 9990, 9992 (HAST).
NANTOU: Tongpu-Lele Suzuki s. n. 1935 (TAI).
CHIAYI: Huwei-Chiehtung Peng 8894 (Holotype, HAST; Isotypes, GH, K, MO, NY, TAI, TAIF, US); Lungmei-Tsaoshan Peng 10079 (HAST); Taiping Chen 395 (HAST).
KAOHSIUNG: Chishan-Tainan Chung s. n. 1985 (PPI); Shuanghsi Yang 3464.
Stolons: present
Stipules: caducous
Stipules: shape: ovate
Stipules: apex: acuminate
Stipules: margin: serrate
Stipules: length (mm): 16 mm
Stipules: width (mm): 10 mm
Stipules: indumentum: glabrous
Leaves: shape: ovate, palmately divided
Leaves: apex: acuminate
Leaves: margin: serrate
Leaves: length (cm): 10-27 cm
Leaves: width (cm): 5-18 cm
Leaves: indumentum: scaberulous
Venation: palmate
Veins: number: 5-8
Petioles: length (cm): 5-16 cm
Petioles: diameter (mm): 6 mm
Petioles: indumentum: glabrous
Bracts: caducous
Bracts: shape: ovate, rotund
Bracts: apex: acute
Bracts: margin: serrate
Bracts: length (mm): 13 mm
Bracts: width (mm): 10 mm
Bracts: indumentum: glabrous
Inflorescence: length (cm): 6-30 cm
Peduncles:: erect, pendulous
Peduncles: length (cm): 4-17 cm
Peduncles: diameter (mm): 4 mm
Flowers: color: pinkish
Male flower petals: number: two
Outer 2 tepals of male flowers: shape: orbicular
Outer 2 tepals of male flowers: length (mm): 12-22 mm
Outer 2 tepals of male flowers: width (mm): 13-20 mm
Stamens: number: 20-37
Stamens: shape: golf-club shaped
Anthers: shape: obovoid
Anthers: length (mm): 1.2-1.6 mm
Anthers: diameter (mm): 1-1.1 mm
Filaments: length (mm): 2-3 mm
Female flower tepals: number: three, two
The largest tepals of female flowers: shape:: rotund, orbicular
The largest tepals of female flowers: length (mm): 12-19 mm
The largest tepals of female flowers: width (mm): 11-19 mm
Styles: number: three
Styles: length (mm): 4.6-5.4 mm
Locules number: three
Fruits: typ: capsule
Fruits: wings: 3-winged
Abaxil wing of fruits: shape: triangular
Abaxil wing of fruits: length (mm): 19 mm
Abaxil wing of fruits: width (mm): 20 mm
Seeds: shape: obclavate
Seeds: length (mm): 0.4-0.52 mm
Seeds: diameter (mm): 0.1-0.16 mm
Seed apex: shape: acuminate
Seed micropylar end: abruptly constricted
Chrosome numer 2n=: 36
Elevation (m): 100-1000 m
Distribution: Taichung, Nantou, Chiayi, Tainan, Kaohsiung
Plant: growth form: epipetric
Phenology: deciduous
Stems: habit: tuberosous