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

194
BEGONIACEAE
truncate. Pistillate flower: pedicel 1.5–2.5 cm; tepals 5, pink,
outer ones rhomboid to ovate-triangular, inner ones gradually
diminishing, innermost one lanceolate; ovary obovoid-oblong,
glabrous, unequally 3-winged, placentae parietal; styles 3. Capsule
ellipsoid, glabrous, with 3 unequal wings, abaxial wing
obliquely broadly ligulate, lunate, or subrectangular. Fl. May–
Sep, fr. July–Nov.
● Mossy limestone rocks in valleys; 800–1500 m. Yunnan
(Hekou, Maguan, Pingbian).
125. Begonia pseudoleprosa C. I Peng et al., Bot. Stud. 47:
214. 2006.
假 癞 叶 秋 海 棠 jia lai ye qiu hai tang
Herbs, rhizomatous. Rhizomes creeping, 4–7.5 mm in
diam.; internodes 3.5–5 mm. Leaves all basal; stipules triangular
or narrowly triangular; petiole 5–20 cm; blade all green,
broadly ovate to suborbicular, 5–11 × 4–8.5 cm, subleathery,
nearly flat, adaxially subglabrous, basally 5- or 6-veined, base
shallowly cordate, apex shortly acuminate or acute. Inflorescences
a dichasial cyme with 5–15 flowers; staminate flowers
3–11, pistillate flowers 1–4; bracts lanceolate, ligulate, or oblong.
Staminate flowers: pedicel 8–30 mm, glabrous; tepals 4,
outer 2 white or pinkish, suborbicular; inner 2 tepals white,
oblong; androecium zygomorphic, subglobose; stamens 15–40,
golf-club-shaped; anthers oblong-obovoid, apex subemarginate.
Pistillate flowers: pedicel 6.5–13 mm, bracteole absent; tepals
3, outer 2 tepals white or pinkish, suborbicular; inner tepals
white, oblong or narrowly obovate; ovary obovoid-ellipsoid, 3-
winged, 1-loculed with parietal placentation; styles 3; Capsule
nodding, 10–12 × 4.5–5.5 mm. Fl. Nov–Dec.
● Limestone hills. Guangxi (Daxin).
126. Begonia psilophylla Irmscher, Notes Roy. Bot. Gard. Edinburgh
21: 39. 1951.
光 滑 秋 海 棠 guang hua qiu hai tang
Herbs, 29–42 cm tall. Rhizomes to 2.5 cm in diam. Stems
erect, seen only at anthesis, glabrous. Leaves basal and cauline;
stipules caducous; petiole to 30 cm, glabrous; blade ovatecordate,
nearly symmetric, 8–19 × 6–13 cm, glabrous, base
slightly oblique, rounded or slightly cordate, margin remotely
and minutely serrulate, apex caudate. Inflorescences glabrous;
peduncle 8–17 cm; bracts elliptic to ovate-oblong, 7–9 × 4–5
mm, glabrous. Staminate flowers: pedicel 1.2–1.4 cm tepals 4,
pink to dark red-brown, outer 2 elliptic, 10–13 × 7–8 mm, inner
2 obovate-oblong, 8–12 × 3–7 mm; stamens 70–90; filaments
0.7–2.1 mm; anthers oblong, 0.7–2.9 mm. Pistillate flowers:
pedicel 0.9–1.1 cm; tepals 5, subequal, oval, largest 6–10 × 4–7
mm, smallest 6–9 × 4–5 mm; ovary glabrous, 2-loculed; placentae
axile, bilamellate; styles 2, 2.6–4.2 mm, fused to halfway;
stigmas 2-cleft, spiraled. Capsule nodding, ellipsoid, 8–10
mm, unequally 3-winged; abaxial wing falcate, 12–15 × ca. 9
mm, apex rounded; lateral wings smaller. Fl. Feb. 2n = 23*.
● Forests, on limestone rocks in shaded moist environments; 100–
700 m. Yunnan (Hekou).
127. Begonia pulvinifera C. I Peng & Yan Liu, Bot. Stud. 47:
319. 2006.
肿 柄 秋 海 棠 zhong bing qiu hai tang
Herbs. Rhizomes elongate, creeping, to 2 cm in diam.
Leaves arising from rhizome; stipules triangular, 2.8–3 × 1.7–
1.9 cm, glabrous, margin entire, apex acuminate or cuspidate,
persistent; petiole greenish, to 24 cm, glabrous, base reddish
brown, swollen; blade green, peltate, ovate, slightly asymmetric,
14–21 × 8–14 cm, glabrous, venation palmate, base
rounded, margin entire or nearly so, apex acuminate, shortly
caudate. Inflorescences 17–45 cm, glabrous; peduncle 34–37
cm; bracts reddish brown, narrowly ovate, 2–2.5 × 0.9–1.2 cm,
glabrous, margin entire, apex acute to acuminate. Tepals pinkish,
glabrous. Staminate flowers: pedicel 2.2–3.5(–4.8) cm; tepals
4, glabrous, outer 2 broadly ovate, 2.3–2.8 × 2.2–2.5 cm,
inner 2 oblanceolate, 16–18 × 5–8 mm, apex obtuse; stamens
more than 100; filaments nearly free, 3–5 mm; anthers obovoid,
ca. 1 mm, apex truncate or subemarginate. Pistillate flowers:
pedicel 1.3–1.5 cm; tepals 3, glabrous, outer 2 depressed-ovate,
1.8–2 × 2.4–2.6 cm, inner 1 oblanceolate, 1.2–1.4 × 4–5 mm;
ovary glabrous, unequally 3-winged, 3-loculed; placentae axile,
bilamellate; styles 3, 4–4.5 mm, fused at base; stigmas 2-cleft,
in a spiraled band. Infructescences 17–45 cm; capsules nodding,
ca. 3.1 cm, unequally 3-winged; abaxial wing lunate, ca. 5
mm; lateral wings smaller, 2–3.5 mm.
● Forests, on limestone rocks; ca. 300 m. Guangxi (Jingxi).
This species is known only from the type gathering. It resembles
Begonia cavaleriei but is distinguishable by having stipules triangular
with the apex acuminate or cuspidate, the petiole pulvinate, and bracts
ovate with the apex acute or acuminate. It is also similar to B. wangii
but differs by having the petiole with a reddish brown swollen base, the
abaxial surface of the leaf blade pale green, tepals obtuse, those of staminate
flowers 4, those of pistillate flowers 3, and the ovary with axile
placentation throughout.
128. Begonia purpureofolia S. H. Huang & Y. M. Shui, Acta
Bot. Yunnan. 16: 340. 1994.
紫 叶 秋 海 棠 zi ye qiu hai tang
Herbs. Rhizomes elongate, to 1.2 cm in diam. Stems to
100 cm, to 1.5 cm in diam., densely hairy. Leaves basal and
cauline; stipules caducous, ovate-lanceolate, 8–19 × 5–9 mm,
abaxially densely pilose, margin ciliate, apex acute; petiole 4–
24 cm, hairy; blade purple, ovate-triangular, asymmetric, 6.5–
23 × 4.5–18 cm, densely hairy, venation palmate, base oblique,
cordate, margin irregularly serrulate and ciliate, shallowly
lobed, apex acute to acuminate. Inflorescences hairy; peduncle
8–14 cm; bracts caducous, ovate-lanceolate, 14–15 × 8–9 mm,
densely villous, margin denticulate, apex acute. Staminate flowers:
pedicel 1.7–2.6 cm; tepals 4, pink, outer 2 ovate, ca. 1.8 ×
1.2–1.3 cm, abaxially villous, inner 2 oblong, 1.1–1.2 × ca. 0.7
cm; stamens ca. 150; filaments fused to halfway, 1.6–3.9 mm;
anthers obovoid-oblong, 0.9–1.4 mm. Pistillate flowers: pedicel
1.3–1.9 cm; ovary densely villous, 2-loculed; placentae axile,
bilamellate; tepals 5, pink, broadly ovate to oblong, unequal,
largest 1.5–1.6 × 1–1.1 cm, abaxially pilose, smallest 1.5–1.6 ×
0.8–1.1 cm; styles 2, fused to halfway, 3.9–5.1 mm; stigmas 2-
cleft, spiraled. Capsule nodding, unequally 3-winged; abaxial
wing ligulate, ca. 1.6 × 1.2 cm; lateral wings to 1.2 cm.
● Forest understories; 900–1700 m. Yunnan (Jinping, Pingbian).