BEGONIACEAE 1. BEGONIA Linnaeus, Sp. Pl. 2: 1056. 1753.

BEGONIACEAE 175
55. Begonia forrestii Irmscher, Mitt. Inst. Allg. Bot. Hamburg
10: 548. 1939.
陇 川 秋 海 棠 long chuan qiu hai tang
Herbs, deciduous. Rhizomes elongate, moniliform, ca. 8
mm in diam. Leaves basal; stipules caducous, broadly ovate to
subtriangular, 6–7(–8) × 3–4.6 mm, glabrous, apex cuspidate;
petiole (4–)10–15(–20) cm, densely villous; blade ovate to oval,
asymmetric, 7–13 × 7–10(–14) cm, abaxially densely hirsute,
adaxially sparsely hispidulous, venation palmate, 5-veined, base
deeply cordate, margin irregularly serrulate, apex acute or obtuse,
rarely rounded. Inflorescences 14–20 cm tall; bracts ovateoblong
or oblong, 4–7 × 2.2–4.5 mm, margin glandular, apex
obtuse. Staminate flowers: pedicel 1.1–2.1 cm; tepals 4, pink,
outer 2 broadly ovate to orbicular, 1.4–2.3 × 1.2–1.9 cm, abaxially
with long glandular hairs, inner 2 obovate to oval, 11–18 ×
9–13 mm; stamens numerous; filaments ca. 1.4 mm; anthers
obovoid-globose, 1.3–1.7 mm. Pistillate flowers: pedicel to 1.8
cm; tepals 5, pink, largest broadly elliptic to suborbicular, 1.2–
1.8 × 1–1.6 cm, abaxially pubescent, smallest narrowly obovate
to ovate, 1.3–2 × 0.9–1.2 cm; ovary sparsely villous, 2-loculed;
placentae axile, bilamellate; styles 2, 4–6 mm, fused at base;
stigmas 2-cleft, spiraled. Capsule nodding, 8–10 mm, unequally
3-winged; abaxial wing ligulate, 1.2–1.5 × 1.1–1.6 cm; lateral
wings smaller. Fl. Apr–May, fr. Jul.
● On rocks, in shaded moist environments, on mountain slopes or
on rocky cliffs in valleys; 1200–2600 m. Yunnan (Longchuan, Tengchong,
Yingjiang).
56. Begonia gagnepainiana Irmscher, Mitt. Inst. Allg. Bot.
Hamburg 10: 538. 1939.
昭 通 秋 海 棠 zhao tong qiu hai tang
Herbs. Rhizomes elongate, 2–3 mm in diam. Leaves basal;
stipules ovate, 3.5–15 × 2.5–10 mm, glabrous, apex apiculate;
petiole 2.5–10 cm, densely rusty villous; blade ovate, asymmetric,
3.5–5 × 2.4–4 cm, abaxially sparsely setulose, adaxially
brown hairy, venation palmate, 6-veined, base oblique, deeply
cordate, margin irregularly serrulate, apex caudate. Inflorescences
8–13.5 cm, glabrous; bracts ovate-oblong, 7–9 × 2.5–3
mm, margin slightly ciliate, apex acute. Staminate flowers:
pedicel 1.4–1.8 cm; tepals 4, outer 2 broadly ovate, nearly as
long as wide, abaxially setose, inner 2 oblong-obovate, 8–9 ×
4–4.5 mm; stamens numerous; filaments ca. 2.1 mm; anthers
obovoid, 1–1.2 mm. Pistillate flowers: pedicel 1–2.1 cm; tepals
5, unequal, largest broadly ovate, nearly as long as wide, 5.8–
8 × 5.8–8 mm, abaxially setose, smallest broadly elliptic to oblong-obovate,
4.4–7 × 3.5–4.4 mm; ovary oblong, 3.5–4 ×
1.5–2 mm, sparsely long hairy, 2-loculed; placentae axile, bilamellate;
styles 2, ca. 3.6 mm, fused to halfway. Capsule unequally
3-winged. Fl. Jul–Aug.
● NE Yunnan (Zhaotong).
Only one gathering (the type) has been seen. This species is similar
to Begonia smithiana but differs in having smaller, unlobed leaves.
57. Begonia glechomifolia C. M. Hu ex C. Y. Wu & T. C. Ku,
Acta Phytotax. Sin. 33: 255. 1995.
金 秀 秋 海 棠 jin xiu qiu hai tang
Herbs, deciduous. Tubers ca. 1.8 cm in diam. Stems 18–
25 cm tall, glabrous or subglabrous. Leaves basal and cauline;
stipules caducous; petiole 3–9 cm, glabrous or subglabrous;
blade subreniform, nearly symmetric, 2.5–5.5 × 4–8.5 cm, both
surfaces subglabrous, venation palmate, 5–7-veined, base cordate,
margin remotely denticulate, apex rounded or acute. Inflorescences
terminal, glabrous; peduncle 9–13 cm; bracts caducous.
Staminate flowers: pedicel 1–1.3 cm; tepals 4, outer 2
oblong or broadly ovate, ca. 1.2 × 1 cm, inner 2 obovate, ca. 7 ×
5 mm; stamens numerous; filaments free; anthers subglobose,
ca. 0.8 mm. Pistillate flowers: tepals 3, outer 2 broadly ovate,
ca. 8 × 8 mm, inner 1 oblong, 5–6 × ca. 4 mm; ovary oblong, 3-
loculed; placentae axile, bilamellate; styles 3; stigmas spiraled.
Capsule unequally 3-winged; abaxial wing falcate, ca. 9 × 0.6
mm; lateral wings smaller, lunate, ca. 2 mm. Fl. Jun.
● On rocks; ca. 3000 m. Guangxi (Jinxiu, Xiangzhou).
58. Begonia grandis Dryander, Trans. Linn. Soc. London 1:
163. 1791.
秋 海 棠 qiu hai tang
Herbs, deciduous. Tubers subglobose, 8–12 mm in diam.
Stems 28–60 cm tall, subglabrous. Leaves cauline; stipules caducous,
oblong to lanceolate, ca. 10 × 2–4 mm, membranous,
margin entire, apex acuminate; petiole 4–20 cm, subglabrous;
blade broadly ovate, asymmetric, 10–20 × 7–14 cm, venation
palmate, 7(–9)-veined, base obliquely cordate, margin irregularly
serrulate, apex acuminate to long acuminate. Inflorescences
terminal and axillary, 7–16 cm tall, glabrous, terminal inflorescence
racemose at base, axillary inflorescence cymose; bracts
caducous, oblate to oblong, 5–13 × 2–17 mm, margin entire,
apex obtuse. Staminate flowers: pedicel 0.8–2.2 cm; tepals 4,
white to pink, glabrous, outer 2 broadly ovate or suborbicular,
1.1–1.7 × 1–1.7 cm, inner 2 obovate to obovate-oblong, 7–11 ×
3–9 mm; stamens 28–140; filaments to 6.1 mm; anthers obovoid,
0.8–1.1 mm, apex emarginate. Pistillate flowers: pedicel
2.5–5 cm; tepals 3, white to pink, glabrous; outer 2 suborbicular
or oblate-orbicular, ca. 1.2 × 1.2 cm, inner 1 obovate, ca. 8 ×
6 mm; ovary glabrous, 3-loculed; placentae axile, bilamellate;
styles fused at base or free; stigmas 2-cleft or U-shaped,
spiraled or not. Capsule pendulous, oblong, 10–12 × ca. 7 mm,
unequally 3-winged; abaxial wing oblong or triangularly oblong,
ca. 1.8 cm; lateral wings narrowly triangular, or all wings
narrowly triangular. Fl. Jul, fr. Aug. 2n = 26*.
● Forests, evergreen broad-leaved forests on montane slopes,
streamsides in dense valley forests, moist rocky cliffs of valleys, wet
fissures of limestone rocks, on rocks in shaded moist environments, on
slopes, in valleys, or by streams; 100–3400 m. Anhui, Fujian, S Gansu,
Guangxi, Guizhou, Hebei, Henan, Hubei, Hunan, Jiangxi, Shaanxi,
Shandong, Shanxi, Sichuan, Yunnan, Zhejiang.
1a. Styles free, not branched; stigma apical
or reniform; filaments connate not
beyond 1 mm ..................................... 58c. subsp. holostyla
1b. Styles connate at base or slightly connate,
branched; stigma spirally tortuous,
U-shaped; stamens more numerous,
filaments connate to or beyond 2 mm
above base.