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

170
BEGONIACEAE
berulous, more densely so on veins, adaxially subglabrous to
sparsely hairy, venation palmate, base cordate, margin irregularly
serrulate, very shallowly lobed, apex caudate-acuminate.
Inflorescences puberulous; peduncle ca. 13 cm. Bracts oblong,
to 1.2 cm, apex acute. Staminate flowers: pedicel ca. 1.2 cm;
tepals 4, pink, outer 2 broadly ovate, ca. 1.8 × 1.2 cm, outside
puberulous, inner 2 oblong, 7–8 × ca. 5 mm, glabrous; filaments
1–1.2 mm; anthers numerous, oblong-obovoid, ca. 1 mm. Pistillate
flowers: pedicel ca. 1.2 cm; tepals 5, pink, unequal, 1–1.8 ×
4–10 cm, abaxially puberulous; ovary puberulous, 2-loculed;
placentae axile, bilamellate; styles 2; stigmas 2-cleft, spiraled.
Capsule nodding, unequally 3-winged; abaxial wing ligulate or
falcate, ca. 18 × 8 mm, apex rounded; lateral wings smaller, ca.
12 × 6 mm.
● Broad-leaved forests, moist places; 1400–1800 m. Yunnan (Pingbian).
This species resembles Begonia dryadis but differs by its welldeveloped,
elongate rhizome and the predominantly basal leaves.
36. Begonia daxinensis T. C. Ku, Acta Phytotax. Sin. 35: 45.
1997.
大 新 秋 海 棠 da xin qiu hai tang
Begonia zhangii D. Fang & D. H. Qin.
Herbs, rhizomatous. Rhizomes elongate. Leaves all basal;
stipules caducous, ovate, 6–12 mm, abaxially villous on veins
when young, apex awned; petiole 5–14 cm, sparsely to moderately
villous; blade adaxially green, with a whitish ringshaped
belt, obliquely ovate to suborbicular, 10–24 × 10–17
cm, herbaceous or papery, abaxially subglabrous or scaberulous,
adaxially glabrous, basally 6- or 7-veined, tertiary veins
weakly percurrent, base cordate, margin denticulate, apex shortly
caudate. Inflorescences axillary; peduncle 13–20 cm, pilose
or sparsely villous; flowers white or pinkish, 4–10 in 3–4 times
branched dichasial cyme. Staminate flowers: tepals 4, outer 2
broadly elliptic or broadly ovate, 1.2–1.9 × 1–1.6 cm, abaxially
glandular pilose, inner 2 obovate or broadly oblanceolate, 12–
14 × 4–5 mm, glabrous; stamens 16–27. Pistillate flowers: tepals
3, outer 2 suborbicular, 1–1.5 × 1–1.2 cm, abaxially glandular
pilose, inner 1 obovate, 5–7.5 × 2–5 mm; ovary 1-loculed
with parietal placentation. Capsule nodding, ovate-oblong, 13–
20 × 6–8 mm, glabrous, subequally 3-winged; wings lunate, 3–7
mm. Fl. Mar–Jun, fr. Apr–Jun.
● Limestone hills, shaded rocky places. Guangxi (Daxin,
Long’an).
37. Begonia debaoensis C. I Peng et al., Bot. Stud. 47: 207.
2006.
德 保 秋 海 棠 de bao qiu hai tang
Begonia bonii Gagnepain var. remotisetulosa Y. M. Shui &
W. H. Chen.
Herbs, rhizomatous. Rhizomes 20–60 cm, slender, 2.5–6
mm in diam.; internodes 1.5–3.5 cm. Leaves basal; stipules triangular
to ovate-triangular, 4–9 × 4–6 mm, apex acute or obtuse;
petiole 5–12 cm, 1.5–3 mm in diam., villous; blade adaxially
green or dark green on veins, otherwise whitish or pale
green, broadly ovate or suborbicular, 5–9.5 × 3.6–6.8 cm,
basally 5- or 6-veined, tertiary veins percurrent and loosely
reticulate. Inflorescences axillary, flowers 4–7 in a dichasial
cyme; peduncle 6–15 cm, glabrous; bracts ovate to orbicular, 3–
5 × 3–4 mm, margin ciliate. Staminate flowers: pedicel 9–17
mm; tepals 4, outer 2 pink toward margin, whitish in middle,
suborbicular, 6–11 × 7–12 mm, inner 2 oblong or narrowly obovate,
8–10 × 3–4 mm; stamens abnormal, base with exposed
ovulelike structures, apex forming a stigmalike structure, without
anthers. Pistillate flowers: pedicel 7–11 mm, sometimes with
a bracteole; tepals 3, caducous or nearly so, outer 2 tepals bicolored
as staminate flowers, suborbicular, 5–11 × 5–11 mm,
inner 2 tepals oblong or narrowly obovate, 4–7 × 2.5–3.5 mm,
apex obtuse; ovary ellipsoid, 5–8 × 3.7–4.1 mm, unequally or
subequally 3-winged, 1-loculed with parietal placentation; abaxial
wing lunate, 3–5 × 5–7 mm; styles 3, fused in proximal
1/4. Capsule not developed. Fl. Aug–Jan. 2n = 30*.
● Walls of caves at bases of steep limestone hills. W Guangxi
(Debao).
38. Begonia dentatobracteata C. Y. Wu, Acta Phytotax. Sin.
33: 254. 1995 [“dentato-bracteata”].
齿 苞 秋 海 棠 chi bao qiu hai tang
Herbs, deciduous. Tubers 1.5–1.9 cm in diam. Leaves 2-
or 3-fasciculate on tuber; stipules membranous, caducous; petiole
13–16.5 cm, glabrous or subglabrous; blade oblong-ovate or
oblong, slightly asymmetric, 11–14 × 6.9–8.8 cm, abaxially hispidulous
on veins, adaxially sparsely hispidulous, base cordate,
margin serrulate, undivided, apex caudate-acuminate. Inflorescences
terminal, racemose at base, ca. 26 cm tall; bracts oblong
to obovate, membranous, apex (2 or)3–5 toothed. Staminate
flowers: tepals 4, pink, outer 2 broadly ovate, 4–5 × 3–3.5 mm,
inner 2 oblong, ca. 2.5 × 1 mm; stamens numerous; filaments
fused to halfway; anthers oblong, ca. 1 mm. Pistillate flowers:
tepals not seen; ovary 3-loculed; placentae axile, bilamellate;
styles 3, free; stigmas U-shaped. Capsule pendulous, unequally
3-winged; abaxial wing oblate-orbicular, 7–13 × 7–12 mm,
apex acute or obtuse; lateral wings smaller. Fl. Jul, fr. Aug.
● Broad-leaved forests, on rocky cliffs in shaded environments;
1600–1900 m. W Yunnan (Pianma).
This species is similar to Begonia labordei and probably can only
be separated by its distinctly dentate bracts with 3–5 teeth at the apices.
39. Begonia dielsiana E. Pritzel, Bot. Jahrb. Syst. 29: 479. 1900.
南 川 秋 海 棠 nan chuan qiu hai tang
Herbs. Rhizome 1.2–3.5 cm in diam. Stem very short.
Leaves mostly arising from rhizome; stipules caducous; petiole
16–50 cm, glabrous; blade broadly oblong-ovate, asymmetric,
9–17 × 7–15 cm, both surfaces glabrous or adaxially sparsely
hairy, venation palmate, 6-veined, base oblique, deeply cordate,
margin remotely serrulate, very shallowly divided, 5–10-lobed;
lobes triangular or broadly triangular, apex acuminate. Inflorescences
9–24 cm tall, glabrous; bracts caducous. Staminate
flowers: pedicel 2–2.7 cm; tepals 4, white to pinkish, glabrous,
outer 2 orbicular or broadly ovate, 2–2.5 × ca. 2 cm, inner 2
oblong, ca. 2 × 1 cm; stamens numerous; filaments 2.5–3 mm;
anthers oblong-obovoid, ca. 1.8 mm, apex emarginate. Pistillate
flowers: pedicel 2.7–3.1 cm; ovary obovoid, glabrous; unequal-