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Table 3 Camparison of Begonia melanobullata with B. ferox and B. nahangensis

From: Six new species of Begonia (Begoniaceae) from limestone areas in Northern Vietnam

  B. melanobullata B. ferox(Peng et al.[2013]: figures five and six) B. nahangensis(Averyanov and Nguyen[2012]: figure seven)
Stipule    
 Length 1.4–2.5 cm 1–1.7 cm 0.4–0.6 cm
Leaf    
 Apex Acuminate Acuminate Obtuse to nearly rounded
 Shape Widely ovate to widely elliptic Ovate Broadly oblique-ovate or oblique-reniform
 Conical bullae on upper surface Present on all leaves; erect hairs tipping bullae persistent Progressively developed on leaves as the plant matures; hairs on bullae soon deciduous Unknown
Inflorescence    
 Peduncle length (cm) 15–38 5–13 (8–) 10–12 (−14)
Male flower    
 Tepal color Greenish Pale pinkish-yellow White to light pink
 Tepal size (mm) Outer 6–9 × 7–9, inner 5–7 × 3–4 Outer 9–11 × 6–11, inner 7–11 × 4 Outer 8–9 in diam., inner 8–9 × 2.5–3.5
 Another length (mm) 0.5–0.8 Ca. 1 Ca. 0.5
Female flower    
 Tepal color Yellowish-pinkish Pinkish-white Light olive-green
 Tepal size (mm) Outer 7–8 × 7–8, inner 4–6 × 2–3 Outer 8–11 × 7–11 mm, inner 8–9 × 3–4 Outer (4.5) 5–6 (7) × (8) 9–11 (12) mm, inner 5–6 × 3–3.5
Capsule    
 Size 1.2–1.9 cm long; abaxial wing crescent-shaped, 0.5–0.7 cm wide 1–1.5 cm long; abaxial wing crescent-shaped, 0.6–0.9 cm wide 0.8–1 cm long; abaxial wing oblique-triangular, 0.4 cm wide
Distribution Northern Vietnam Guangxi, China Northern Vietnam