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Flora of Taiwan | Family List | Begoniaceae | Begonia

Begonia taiwaniana Hayata in J. Coll. Sci. Imp. Univ. Tokyo (Mater. Fl. Formosa). 30(1): 125. 1911,Icon. Pl. Form. 2: 45. 1912, Gen. Ind. Fl. Form. 31. 1917; Sasaki, List Pl. Form. 301. 1928; Suzuki in Masamune, Short Fl. Form. 145. 1936; Masamune, List Vas. Pl. Taiwan 58. 1954; Liu & Lai, Fl. Taiwan 3: 798. 1977; Chen, Fl. Taiwan. 2nd Ed. 3: 853. 1993.


Begonia taiwaniana

Credit: Ching-I Peng

Plant terrestrial; evergreen; with very short rhizomes from which upright stems arise, monoecious. Stems 40-200 cm long, to 46 mm across, glabrous. Rhizomes ___cm long, ___ mm across, (hair). Stipules caducous, narrowly ovate, apex acuminate to cuspidate, margins entire, to 27 mm long, 19 mm wide, glabrous. Leaves many, all cauline, often with white spots adaxially, often reddish beneath, herbaceous, asymmetric, lanceolate, undivided, apex acuminate to to caudate, base shallowly cordate, margins irregularly denticulate or serrulate, 6-14 cm long, 1.5-4 cm wide, remotely scaberulous on both surfaces; venation palmate-pinnate; petiolesto 4 cm long, 4 mm across, glabrous. Inflorescences arise from stem, 5-11 cm long, glabrous; peduncles (inflorescence axis) slender, to 7 cm long, 3 mm across, pendent. Bracts caducous, narrowly triangular, apex acuminate, margins entire, to 21mm long, 9 mm wide, glabrous. Flowers of both sexes pinkish or sometimes white, glabrous. Staminate flowers: tepals 4, outer two obovate to very broadly obovate, 9-18 mm long, 8-17 mm wide, inner two oblanceolate to narrowly obovate, 8-16 mm long, 4-8 mm wide; androecium actinomorphic; stemans 64-91, golf-club shaped, yellow, filaments free, 1..6-2.4 mm long; anthers very narrowly obovoid, 1.9-2.3 mm long, 0.7-0.9 mm across. Pistillate flowers: tepals 5(-6), narrowly obovate to orbicular, unequal, the largest 8-16 mm long, 7-14 mm wide, the smallest 7-15 mm long, 4-8 mm wide; ovary (color) when blooming, inferior, glabrous; styles 3, yellow, free, forked once, 4.5-5.1 mm long; stigmas in a band and spiraled. Fruits capsular, dehiscence, pendent, trigonous, unequally 3-winged, abaxial wing triangular, 12-18 mm long, 10-16 mm wide, lateral wings 4-5 mm long, 11-15 mm wide; locules 3, axile placentation, placental branches 2 per locule.

TAICHUNG: Tungshih Forest Station, Chen 392 (HAST).
NANTOU: Chitou, Chuang 4038 (TAI); Tungpu-Hoshe, Peng & Chen 10951 (HAST); Hoshe Giant Tree, Peng & Chen 10986 (HAST); Wuchieh, Liu 392 (TCF); Choshe, Mori 3429; Yushan, Kawakami & Mori 2046 (Syntype), 2048 (TAIF).
CHIAYI: Tsaoshan, Chen 309 (HAST), Peng 10078 (HAST); Chiehtung, Peng 9994 (HAST).
KAOHSIUNG: Tengchih, Chen & Peng 357, 359, 371 (HAST); Chen 544 (HAST), Yang 5919, 5950, 6013, 6046, 6113 (PPI), Ou 6834 (TCF); Shanping, Chen 103, 104, 523 (HAST), Feng s.n. Apr. 18, 1976 (PPI), Ou 2888 (TCF), Peng 10092, 10093 (HAST); Tona, Chen & Peng 378, 380 (HAST); Shanping-Nanfenshan, Kao 7426; Nanfenshan, Ou 3343 (TCF).
PINGTUNG: Nanjenshan, Chiu 313 (PPI); Kaoshihfo, Soma s. n. 1912 (TAI); Entrance to Peitawushan Chen 643, 673 (HAST); Tashulinshan, Matud s. n. 1919 (NTUF); Laiyi-shakanyalien, s. c. 1492 (NTUF).
TAITUNG: Fengshan-Chiataishan, Yamamoto & Mori 99, 149 (TAI).

Stolons: absent

Stipules: caducous

Stipules: shape: narrowly obovate

Stipules: apex: acuminate

Stipules: margin: entire

Stipules: length (mm): 27 mm

Stipules: width (mm): 19 mm

Stipules: indumentum: glabrous

Leaves: shape: lanceolate

Leaves: apex: acuminate, cuspidate

Leaves: margin: denticulate, serrulate

Leaves: length (cm): 6-14 cm

Leaves: width (cm): 1.5-4 cm

Leaves: indumentum: scaberulous

Venation: palmate-pinnate

Veins: number: 5-7

Petioles: length (cm): 4 cm

Petioles: diameter (mm): 4 mm

Petioles: indumentum: glabrous

Bracts: caducous

Bracts: shape: narrowly triangular

Bracts: apex: acuminate

Bracts: margin: entire

Bracts: length (mm): 21 mm

Bracts: width (mm): 9 mm

Bracts: indumentum: glabrous

Inflorescence: length (cm): 5-11 cm

Peduncles:: pendulous

Peduncles: length (cm): 3-7 cm

Peduncles: diameter (mm): 3 mm

Flowers: color: white, pinkish

Male flower petals: number: four

Outer 2 tepals of male flowers: shape: obovate, broadly obovate

Outer 2 tepals of male flowers: length (mm): 9-18 mm

Outer 2 tepals of male flowers: width (mm): 8-17 mm

Inner 2 tepals of male flowers: shape: oblanceolate, narrowly obovate

Inner 2 tepals of male flowers: length (mm): 8-16 mm

Inner 2 tepals of male flowers: width (mm): 4-8 mm

Stamens: number: 64-91

Stamens: shape: golf-club shaped

Anthers: length (mm): 1.9-2.3 mm

Anthers: diameter (mm): 0.7-0.9 mm

Filaments: length (mm): 1.6-2.4 mm

Female flower tepals: number: five, six

Female flower tepals: equality of size: unequal

The largest tepals of female flowers: shape:: orbicular

The largest tepals of female flowers: length (mm): 8-16 mm

The largest tepals of female flowers: width (mm): 7-14 mm

The smallest tepals of female flowers: shape: narrowly obovate

The smallest tepals of female flowers: length (mm): 7-15 mm

The smallest tepals of female flowers: width (mm): 4-8 mm

Styles: number: three

Styles: length (mm): 4.5-5.1 mm

Locules number: three

Fruits: typ: capsule

Fruits: wings: 3-winged

Abaxil wing of fruits: shape: triangular

Abaxil wing of fruits: length (mm): 12-18 mm

Abaxil wing of fruits: width (mm): 10-16 mm

Lateral wings of fruits: length (mm): 4-5 mm

Lateral wings of fruits: width (mm): 11-15 mm

Seeds: shape: broadly ellipsoid

Seeds: length (mm): 0.29-0.34 mm

Seeds: diameter (mm): 0.19-0.22 mm

Seed apex: shape: rotund

Seed micropylar end: constricted

Chrosome numer 2n=: 38

Elevation (m): 450-2300 m

Distribution: Taichung, Nantou, Chiayi, Kaohsiung, Pingtung, Taitung

Plant: growth form: terrestrial

Phenology: evergreen

Stems: habit: with long ascentant rhizomes from which upright stems arise


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