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Tên Khoa học: Begonia sphenantheroides C.-I Peng
Tên tiếng Anh:
Tên tiếng Việt:
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MÔ TẢ CHUNG

Herbs monoecious, perennial, erect, 50-150 cm tall. Rhizomes congested, 15-25 mm across, to 9 cm long; erect stem stout, 5-20 mm across, internodes 7-30 cm, glabrous. Stipules caducous, triangular or narrowly so, apex aristate or apiculate, margin entire, glabrous. Leaves alternate, petiole to 20-30 cm long, glabrescent (puberulent when young); leaf blade herbaceous, asymmetric, ovate to broadly ovate, 21-41 cm long, 15-28 cm wide, glabrous or subglabrous, base obliquely cordate, margin irregularly loosely serrulate or denticulate; apex acute or short acuminate; venation 7- or 8- palmate. Inflorescences 2-3 (-7)-flowered, protandrous; peduncle 1-5 cm long, scaberulous; bracts deciduous, narrowly ovate to lanceolate, apex acuminate, margin entire, 0.9-1.8 cm long, subglabrous. Staminate flower: pedicel 0.7-1.5 cm long, scabrous; tepals 4, outer 2 reddish, oblong, ovate or orbicular, 0.8-1.9 cm long, 0.5-1.5 cm wide, abaxially scabrous, inner 2 pinkish, broadly oblanceolate to oblong, 0.5-1.7 cm long, 0.3-0.9 cm wide, glabrous; androecium actinomorphic, subglobose, 0.7 cm across, stamens 70-120, yellow, clavate; filaments 0.7-2 mm long, fused to a short central column; anthers 1.5-1.8 mm long, apex truncate. Carpellate flower: pedicel 1.5-2.2 cm long, scabrous; ovary green, unequally 3-winged, wings red, scabrous, 2-locular; placentae axile, bilamellate; tepals 5, reddish, unequal, elliptic to obovate, 0.9-1.8 cm long, 0.5-1.5 cm wide, apex obtuse, abaxially scabrous; styles 2, ca. 5 mm long, 2-cleft, fused at base, stigmatic band wavy-twisted and spiralled. Capsule nodding, unequally 3-winged, abaxial wing falcate, 5-16 mm tall, ca. 7 mm wide, lateral wings triangular or narrowly so, 3-6 mm tall.

Ecology and distribution

Begonia sphenantheroides C.-I Peng is distributed in limestone areas in Ha Giang Province and Tuyen Quang Province, northeastern Vietnam. This species grow on semishaded to shady, moist, mossy rocky slopes in broadleafed forest.

ẢNH

Begonia sphenantheroides C.-I Peng (1) on Phytotaxa 222(2)083-099.jpg at www.BotanyVN.com

Ảnh 1. Begonia sphenantheroides C.-I Peng (1) on Phytotaxa 222(2)083-099.jpg

 

Begonia sphenantheroides C.-I Peng (2) on Phytotaxa 222(2)083-099.jpg at www.BotanyVN.com

Ảnh 2. Begonia sphenantheroides C.-I Peng (2) on Phytotaxa 222(2)083-099.jpg

 

PHÂN LOẠI KHOA HỌC
Giới: Thực vật
Ngành: Magnoliophyta
Lớp: Magnoliopsida
Bộ: Cucurbitales
Họ: Begoniaceae
Chi: Begonia

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