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

BEGONIACEAE 187
× ca. 4.5 mm, glabrous, inner 2 narrowly elliptic, ca. 3 × 1 mm;
stamens numerous; filaments fused at base; anthers narrowly
elliptic, ca. 1.2 mm, apex acute. Pistillate flowers: bracteole 1,
caducous, margin denticulate; tepals 5, unequal, largest broadly
ovate, 7–8 × 6–7 mm, glabrous, apex obtuse or acute, smallest
narrowly elliptic, 6–7 × ca. 1.5 mm, apex obtuse; ovary glabrous,
3-loculed; placentae axile, bilamellate; styles 3, fused at
base; stigmas 2-cleft, spiraled. Capsule pendulous, ca. 10 × 6
mm, unequally 3-winged; abaxial wing triangular, 1.3–1.5 cm;
lateral wings smaller. Fl. Aug, fr. Sep.
Forests, shaded moist environments by streams; 500–1400 m.
Yunnan (Jinghong, Simao) [India, Myanmar, Nepal, Thailand].
102. Begonia morifolia T. T. Yu, Bull. Fan Mem. Inst. Biol.,
n.s., 1: 119. 1948.
桑 叶 秋 海 棠 sang ye qiu hai tang
Begonia anceps Irmscher.
Herbs. Stems to 40 cm, slender and trailing at base, erect
above, villous when young. Leaves cauline; stipules triangularovate,
8–10 mm, abaxially villous; petiole 1.5–2.5 cm, densely
villous; blade ovate or narrowly ovate, asymmetric, 6–9 × 3.5–
4.5 cm, papery, sparsely hispidulous, venation palmate-pinnate,
base oblique, cordate, margin sharply denticulate, apex long
acuminate. Inflorescences hairy; bracts ovate, 8–9 mm, abaxially
pubescent, margin serrate. Staminate flowers: pedicel ca.
1.5 cm; tepals 4(or 5), pink, hairy, outer 2 ovate, ca. 1.5 × 1 cm,
abaxially villous, inner 2 narrow, ovate-oblong, ca. 8 × 2 mm;
stamens numerous; filaments ca. 1.2 mm, free; anthers elliptic,
ca. 1 mm, apex emarginate. Pistillate flowers: tepals 5, hairy,
outer 2 broadly ovate, ca. 10 × 8 mm, inner 2 narrow, ovate-oblong,
ca. 7 × 3.5 mm; ovary 3-loculed; placentae axile, bilamellate;
styles 3; stigmas 2-cleft, spiraled. Capsule pendulous, oblong,
ca. 10 × 7 mm, unequally 3-winged. Fl. Oct–Nov, fr. Dec.
● Forests, shaded moist environments; 1300–1600 m. Yunnan
(Malipo, Xichou).
This species is similar to Begonia alveolata but differs by its
sharply denticulate leaf margin and abaxially hairy outer tepals.
103. Begonia morsei Irmscher, Mitt. Inst. Allg. Bot. Hamburg
10: 554. 1939.
龙 州 秋 海 棠 long zhou qiu hai tang
Herbs, rhizomatous. Rhizomes creeping, tortuous, crispedpilose.
Leaves all basal; stipules caducous, ovate or triangular,
5–7.5 × 3–4 mm, ciliate; petiole 4–16 cm, hirsute-villous; blade
adaxially with a whitish band, obliquely broadly ovate, 5–14 ×
4–10.5 cm, papery, abaxially crisped-pilose, major veins villous,
adaxially densely tuberculate-based setulose, basally 5–7-
veined, tertiary veins percurrent and reticulate, base cordate,
margin denticulate or serrulate, apex acute or acuminate. Inflorescences
axillary; peduncle 6.5–12 cm; flowers 3–15 in a dichasial
cyme; bracts caducous. Staminate flower: pedicel 0.6–2
cm; tepals 4, outer 2 broadly ovate or suborbicular, 6–11 × 6.5–
10 mm, apex rounded, inner 2 obovate-oblong, ca. 7 × 3 mm,
apex obtuse; androecium zygomorphic; stamens numerous; filaments
0.7–1.3 mm, fused at base into a short column; anthers
obovoid, 0.7–0.9 mm. Pistillate flower: tepals 3, outer 2 broadly
ovate, inner 1 smaller; ovary ellipsoid, glabrous, l-loculed with
parietal placentation; styles 3. Capsule nodding, oblong, 5–10 ×
3.5–5 mm, subequally 3-winged, wings lunate.
● Rock walls of caverns, shaded rocky places of forest understories,
understories of secondary forests on limestone hills; ca. 700 m.
Guangxi.
1a. Leaf blade adaxially with a white,
ring-shaped band; inflorescences and
flowers glabrous ...................................... 103a. var. morsei
1b. Leaf blade adaxially with white spots in
intercostal areas; inflorescences and
flowers hairy ................................... 103b. var. myriotricha
103a. Begonia morsei var. morsei
龙 州 秋 海 棠 ( 原 变 种 ) long zhou qiu hai tang (yuan bian
zhong)
Leaf blade adaxially with a white, ring-shaped band. Inflorescences
and flowers glabrous.
● Rock walls of caverns, shaded rocky places of forest understories.
Guangxi (Longzhou).
103b. Begonia morsei var. myriotricha Y. M. Shui & W. H.
Chen, Acta Bot. Yunnan. 27: 368. 2005.
密 毛 龙 州 秋 海 棠 mi mao long zhou qiu hai tang
Leaf blade adaxially with white spots in intercostal areas.
Inflorescences and flowers hairy.
● Understories of secondary forests on limestone hills; ca. 700 m.
Guangxi (Debao).
This variety is somewhat similar to Begonia picturata but differs
by its much smaller flowers and intercostal spots on the adaxial leaf
surface.
104. Begonia muliensis T. T. Yu, Bull. Fan Mem. Inst. Biol.,
n.s., 1: 119. 1948.
木 里 秋 海 棠 mu li qiu hai tang
Herbs, deciduous, 20–30 cm tall. Tubers 1–2 cm in diam.
Leaves 1(or 2); stipules caducous, triangular-ovate, ca. 5 mm,
membranous; petiole 14–21 cm, pilose; blade broadly cordateovate,
asymmetric, 9–14 × 11–17 cm, abaxially sparsely hispidulous,
adaxially sparsely hirsute, venation palmate, 7-veined,
base cordate, slightly asymmetric, margin irregularly serrate,
shallowly divided to ca. 1/3 of leaf length; lobes 5–7, apex acuminate.
Inflorescences terminal, racemose at base, 16–30 cm tall,
pilose; bracts ovate-lanceolate, ca. 5 mm, glabrous, apex acute.
Staminate flowers: pedicel 8–12 mm; tepals 4, pinkish, outer 2
broadly ovate, ca. 10 × 9 mm, abaxially pilose, inner 2 oblanceolate,
9–11 × 3–4 mm; stamens numerous; filaments ca. 1.2
mm, fused at base; anthers broadly oblong, ca. 1.2 × 1 mm,
apex emarginate. Pistillate flowers: pedicel 2–2.5 cm; tepals 3,
outer 2 ovate, ca. 8 × 6 mm, abaxially pilose or subglabrous,
inner 1 elliptic, ca. 6 × 3 mm; ovary glabrous, veins distinct, 3-
loculed; placentae axile, bilamellate; styles 3, fused at base; stigmas
2-cleft, U-shaped. Capsule pendulous, obovoid-oblong to
oblong, 8–10 × 5–6 mm, unequally 3-winged; abaxial wing triangular,
ca. 1.5 × 1 cm; lateral wings smaller. Fl. Aug, fr. Sep.
2n = 24*.