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

BEGONIACEAE 177
61. Begonia gulinqingensis S. H. Huang & Y. M. Shui, Acta
Bot. Yunnan. 16: 334. 1994.
古 林 箐 秋 海 棠 gu lin qing qiu hai tang
Begonia brevicaulis T. C. Ku (1997), not A. Candolle
(1859); B. sinobrevicaulis T. C. Ku.
Herbs. Rhizomes elongate, 4–6 mm in diam., red hairy.
Leaves basal; stipules triangular-lanceolate, ca. 1.2 × 6 mm, margin
ciliate, apex acuminate; petiole 5.5–15 cm, red hairy; blade
sometimes with several pale greenish spots adaxially, suborbicular,
asymmetric, 5–7 × 6–7.5 cm, abaxially sparsely hirsute,
adaxially sparsely hispidulous, venation palmate, 7-veined, base
obliquely cordate, margin crenulate, apex rounded. Inflorescences
hairy; peduncle ca. 2.1 cm. Staminate flowers: pedicel
ca. 3.5 cm; tepals 4, pink, outer 2 suborbicular, ca. 1.8 cm, glabrous;
stamens numerous; filaments ca. 1.5 mm, fused at base;
anthers obovoid, apex rounded. Pistillate flowers: pedicel ca. 1
cm; ovary hairy, 3-loculed; placentae axile, bilamellate; tepals
5; styles 3; stigmas 2-cleft. Capsule nodding, obovoid, ca. 1 ×
0.8 cm, sparsely hairy, unequally 3-winged; abaxial wing triangular,
ca. 4 × 6 mm; lateral wings ca. 2.5 mm. Fl. Jun, fr. Jul.
● Forests, near summits; 1600–1900 m. Yunnan (Maguan).
62. Begonia gungshanensis C. Y. Wu, Acta Phytotax. Sin. 33:
270. 1995.
贡 山 秋 海 棠 gong shan qiu hai tang
Herbs. Rhizomes moniliform, short, stout. Stems erect, to
90 cm, glabrous or subglabrous. Leaves cauline; stipules caducous,
lanceolate to ovate-lanceolate, 5–8 × ca. 5 mm, membranous,
apex acuminate; petiole 1.5–3 cm, pubescent; blade
falcate or narrowly lanceolate, asymmetric, 8–14 × 2.5–3.8 cm,
abaxially pubescent, adaxially sparsely hispidulous, venation
palmate-pinnate, base obliquely cordate, margin bidentate, very
shallowly lobed, apex long acuminate or long caudate. Inflorescences
glabrous, with 2–4(or 5) flowers; peduncle 4–5(–6)
cm; bracts ovate or oblong, 8–13 × ca. 5 mm, apex acuminate.
Staminate flowers: pedicel 1–1.5(–2) cm; tepals 4, pink, outer 2
broadly ovate, ca. 10 × 9 mm, abaxially villous, inner 2 elliptic,
ca. 8 × 4 mm; stamens numerous; filaments free, 0.8–1 mm;
anthers obovoid, ca. 1 mm. Pistillate flowers not seen. Capsule
ellipsoid or obovoid-oblong, 5–6 mm, glabrous, 2-loculed; placentae
axile, bilamellate; unequally 3-winged; abaxial wing falcate,
1.8–2 × ca. 1.2 cm, apex rounded; lateral wings triangular,
5–10 mm. Fl. Aug, fr. Dec.
● Evergreen broad-leaved forests and scrubby vegetation, by
streams in valleys; 1400–2000 m. NW Yunnan (Gongshan).
This species is similar to Begonia clavicaulis but differs by its
bidentate leaf margin and the 2-loculed ovary.
63. Begonia hainanensis Chun & F. Chun, Sunyatsenia 4: 20.
1939.
海 南 秋 海 棠 hai nan qiu hai tang
Herbs, prostrate. Stems 12–30 cm, 3–4 mm in diam., appressed
hairy. Leaves cauline; stipules oblong-lanceolate, 7–13
× 2–3 mm, abaxially hairy, margin denticulate, apex acuminate;
petiole 2–4 cm, appressed hairy; blade abaxially red on
veins, adaxially dark green, elliptic-oblong, slightly asymmetric,
5–10 × 2–4 cm, abaxially sparsely brown hirsute and pale papillose,
adaxially glabrous or subglabrous, venation palmatepinnate,
5(–7)-veined, base slightly oblique, rounded, margin
remotely denticulate, apex acuminate. Inflorescences terminal
and axillary, subglabrous; staminate inflorescences terminal and
axillary, cymose; pistillate inflorescences axillary, always below
staminate inflorescences, solitary or binary; bracts narrowly
obovate, 3–10 mm, glabrous, margin minutely denticulate, apex
obtuse to acute. Staminate flowers: pedicel 1.2–1.7 cm; tepals
4, white, with reddish veins, glabrous, outer 2 elliptic, 10–11 ×
8–9 mm, inner 2 narrowly oblong, 7–8 × ca. 2 mm; stamens
25–30; filaments fused below. Pistillate flowers: pedicel ca. 8
mm, bracteole 1, margin denticulate, apex acute; tepals 5, glabrous,
unequal, largest white, with reddish veins, broadly elliptic,
9–12 × 7–8 mm, smallest nearly white, narrowly oblong, 9–
10 × 3–4 mm; ovary glabrous, 3-loculed; placentae axile, bilamellate;
styles 3, 2–4 mm, fused at base; stigmas 2-cleft,
spiraled. Capsule pendulous, ovoid-oblong, to 1.4 cm, equally
3-winged; wings triangular, 1.1–1.5 cm. Fl. Apr.
● Forests, on mossy rocks along streams; ca. 1000 m. Hainan
(Baoting, Lingshui).
64. Begonia handelii Irmscher, Anz. Akad. Wiss. Wien, Math.-
Naturwiss. Kl. 58: 24. 1921.
香 花 秋 海 棠 xiang hua qiu hai tang
Herbs, dioecious. Rhizomes prostrate, 8–19 mm in diam.
Leaves on rhizome; stipules caducous, narrowly triangular to
ovate, 15–28 × 9–10 mm, membranous, apex acuminate or
cuspidate; petiole 13–38 cm, sparsely hairy to glabrous; blade
broadly ovate to ovate, asymmetric, 8–29 × 6–18 cm, both surfaces
glabrous, subglabrous, or red pilose, venation palmatepinnate,
7–9-veined, base obliquely cordate, margin irregularly
denticulate, apex acute or acuminate. Inflorescences reduced,
glabrous to pilose; staminate inflorescences erect, with numerous
flowers; pistillate inflorescences pendulous, 2–4-flowered;
bracts caducous, ovate-lanceolate, 8–15(–20) × 5–9 mm, margin
entire, apex acuminate. Flowers fragrant, white to pink; staminate
flowers: pedicel 2–4.5 cm; tepals 4, outer 2 ovate, (0.8–)3–
5.5(–6.5) × 1.8–2.7 cm, apex acute or obtuse, inner 2 narrowly
oblong or linear, 1.8–11 cm × 5–24 mm, apex obtuse; stamens
more than 100; filaments 2–4.1 mm, free; anthers oblong, 2–3.1
mm, apex rounded. Pistillate flowers: pedicel 2–3 cm; tepals 4,
outer 2 elliptic, 2.1–3 × 1.8–2.1 cm, apex rounded, inner 2 narrowly
oblong or linear, 6–15 × 1.9–8 mm, apex rounded; ovary
obovoid, hairy or glabrous, 4(–8)-loculed; placentae axile, forked
once or twice; styles 4, 5.1–7.2 mm, forked once or twice; stigmas
2-cleft, spiraled. Fruit pendulous, wingless or 4(–8)-horned.
Fl. Jan. 2n = 66*.
Forests, variable vegetation, shaded moist environments; 100–
1500 m. Guangdong, Guangxi, Hainan, Yunnan [Laos, Myanmar, Thailand,
Vietnam].
1a. Outer tepals of staminate flowers 0.8–2
cm, apex rounded .................................. 64c. var. prostrata
1b. Outer tepals of staminate flowers 3–6.5
cm, apex usually acute.
2a. Outer tepals of staminate flowers and
ovary glabrous or subglabrous ....... 64a. var. handelii
2b. Outer tepals of staminate flowers
and ovary red pilose ................. 64b. var. rubropilosa