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

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BEGONIACEAE
Herbs. Rhizomes elongate, to 1.8 cm in diam. Leaves basal;
stipules caducous, ca. 14 × 9 mm; petiole 7–18 cm, glabrous;
blade succulent, peltate, broadly ovate to orbicular, nearly
symmetric, 10–14 × 7.5–10 cm, subglabrous to glabrous,
venation palmate, 10–12-veined, base slightly oblique, rounded,
margin indistinctly crenulate, apex abruptly caudate. Inflorescences
20–39 cm tall, glabrous; bracts caducous, 5.3–9 × 3.9–
8.9 mm. Staminate flowers: pedicel 7–17 mm; tepals 4, pinkish,
outer 2 suborbicular or oblate, 1.2–1.8 × 1.7–1.9 cm, glabrous,
inner 2 narrowly oblong, 6–10 × 2–5 mm; stamens 28–35; filaments
1.5–2.2 mm, free; anthers obovoid-oblong, 0.9–1.1 mm,
apex obtuse. Pistillate flowers: pedicel 14–18 mm; tepals 3,
pinkish, outer 2 suborbicular, 1.2–1.5 × 1.7–1.8 cm, glabrous,
inner 1 oblong, ca. 10 × 5–6 mm; ovary obovoid-oblong, ca. 9
× 4–5 mm, glabrous, 3-loculed; placentae axile, bilamellate;
styles 3, 4–4.9 mm, free; stigmas 2-cleft, spiraled. Capsule nodding,
unequally 3-winged; abaxial wing triangular, 1–1.6 × 0.8–
1 cm; lateral wings smaller. Fl. Jun–Jul, fr. Jul.
● Broad-leaved forests, on limestone rocks in semishaded but dry
environments, near mountain summits; ca. 900 m. Hainan (Baisha,
Changjiang).
117. Begonia picta Smith, Exot. Bot. 2: 81. 1805.
樟 木 秋 海 棠 zhang mu qiu hai tang
Begonia echinata Royle.
Herbs, deciduous. Tubers globose, 5–8 mm in diam. Stem
absent or very short. Leaves 1 or 2, basal or cauline; stipules
caducous, ovate-lanceolate, abaxially hairy; petiole 5–8(–15)
cm, pubescent on upper part; blade ovate-cordate, slightly
asymmetric, 5–8 × 4–7 cm, abaxially hirsute, adaxially sparsely
hirsute, venation palmate, 7-veined, base slightly oblique, cordate
to deeply cordate, margin bidentate, apex acuminate. Inflorescences
terminal, 6–15(–21) cm tall, pubescent; bracts ovatelanceolate,
abaxially pilose. Staminate flowers: pedicel 5–10
mm; tepals 4, pink, outer 2 suborbicular, ca. 9 × 7 mm, abaxially
villous, inner 2 elliptic, 5–6 × ca. 2.5 mm; stamens numerous;
filaments 0.8–1 mm, fused at base; anthers oblong, ca. 1
mm, apex emarginate. Pistillate flowers: tepals 5, pink, largest
broadly obovate, 6–7 × 4–5 mm, smallest elliptic, ca. 3.2 × 1.3
mm; ovary villous, 3-loculed; placentae axile, bilamellate; styles
3, fused at base; stigmas 2-cleft, spiraled. Capsule pendulous,
obovoid, ca. 6 mm, unequally 3-winged; abaxial wing lanceolate,
ca. 1.5 × 0.4 cm; lateral wings smaller. Fl. Aug–Sep, fr.
Sep.
Forest margins, on rocks in shaded moist environments by streams
and slopes; 2200–2900 m. Xizang (Nyalam) [N India, Myanmar, Nepal].
This species is similar to Begonia parvula but differs by its bilamellate
placentae.
118. Begonia picturata Yan Liu et al., Bot. Bull. Acad. Sin. 46:
367. 2005.
一 口 血 秋 海 棠 yi kou xie qiu hai tang
Herbs, rhizomatous. Rhizomes 5–15 × 0.6–1.2 cm; internodes
0.8–3 cm. Leaves all basal; stipules ovate-triangular to
lanceolate-triangular, 10–23 × 6–10 mm; petiole 7–17 cm, 3–6
mm thick; blade with a wide whitish ring-shaped belt, or with
digitate dark brown bands along main veins and at leaf margin,
ovate to broadly ovate, 7–20 × 5.5–14 cm, thickly papery, ±
rugose, abaxially shortly villous, particularly so on veins, adaxially
villous-setose or tomentose-setose, basally 6- or 7-veined,
all veins on abaxial surface prominently raised, base obliquely
deeply cordate. Inflorescences axillary, flowers 4–17 in a dichasial
cyme; peduncle 10–16 cm, hirsute-villous; pedicel hispidvillous;
bracts ovate, oblong, or orbicular. Staminate flowers:
tepals 4, outer 2 suborbicular to oblong; inner 2 obovate, oblong,
or oblanceolate; androecium zygomorphic; stamens 20–
50; anthers oblong-obovoid, apex subemarginate, yellow with
red margin along anther sacs. Pistillate flowers: tepals 3, usually
caducous; outer 2 suborbicular to broadly ovate; inner 1 obovate;
ovary 7–11 × 5–7 mm, red villous-setose or hispid-setose,
3-winged, 1-loculed with parietal placentation; wings unequal,
abaxial wing lunate. Capsule nodding, 10–15 × 6–8 mm; abaxial
wing 6–9 mm tall. Fl. Feb–May, fr. Mar–Jun. 2n = 30*.
● Shaded rocky limestone slopes, in caves; 700–800 m. Guangxi
(Jingxi).
119. Begonia pinglinensis C. I Peng, Bot. Bull. Acad. Sin. 46:
261. 2005.
坪 林 秋 海 棠 ping lin qiu hai tang
Herbs. Rhizomes elongate, to 1 cm in diam. Stems 35–50
cm. Leaves basal and cauline; stipules caducous, narrowly ovate
to ovate, to 9.7 × 3.6 mm, glabrous, margin entire, apex acuminate;
petiole often reddish, to 16(–20) cm, hispid or villosulous;
blade narrowly ovate to ovate, asymmetric, 7–16(–25) ×
5–9(–14) cm, pilose to pilose-sericeous, venation palmate, 7–
10-veined, base oblique, shallowly cordate, margin irregularly
serrulate to denticulate, apex acuminate to cuspidate. Inflorescences
to 25 cm, hispid; peduncle to 15 cm; bracts caducous,
narrowly ovate, to 7.5 × 3.5 mm, papery, glabrous, margin entire,
apex acuminate. Staminate flowers: tepals 4, white to pinkish,
outer 2 broadly ovate to ovate, 0.7–2 × 0.6–1.7 cm, abaxially
hairy, inner 2 oblanceolate to narrowly obovate, 0.8–1.7
cm × 4–9 mm; stamens 46–81; filaments free, 0.7–1.6 mm;
anthers narrowly oblong to oblanceolate, 0.8–1.4 mm. Pistillate
flowers: tepal 5, unequal to subequal, narrowly obovate to
broadly obovate, largest 1–1.9 × 0.9–1.7 cm, abaxially hairy,
smallest 6–19 × 5–14 mm; ovary hairy, 2-loculed; placentae
axile, bilamellate; styles 2, 4–5(–5.7) mm, fused at base, stigmas
2-cleft, spiraled. Capsules nodding, trigonous, unequally 3-
winged; abaxial wing triangular to ligulate, 1.3–2.8 × 0.9–1.9
cm; lateral wings smaller. 2n = 38*.
● Forests; 200–300 m. N Taiwan (Taibei).
This species is similar to Begonia chitoensis but differs by its
densely hairy blade and hairy tepals and ovary.
120. Begonia platycarpa Y. M. Shui & W. H. Chen, Acta Bot.
Yunnan. 27: 368. 2005.
扁 果 秋 海 棠 bian guo qiu hai tang
Herbs, rhizomatous. Rhizome 4–10 cm, 2–3 mm in diam.,
sparsely hirsute, hairs 2–3 mm; internodes 5–9 mm. Leaves all
basal; stipules mostly persistent, reflexed, triangular, 6–8 × 3–4
mm, adaxially densely pilose; petiole 5–10 cm, hirsute (hairs 3–