Table 3.

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

	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