Table 1.

Comparison of Begonia caobangensis and B. aequilateralis

	B. caobangensis	B. aequilateralis
Stipule
Size (cm)	2–2.5 × 0.7–1	1 × 0.3
Petiole	Narrowly winged	Not winged
Leaf
Base	Decurrent	Obtuse to cuneate
Staminate flower
Tepal size (mm)	Outer 10–12 × 4–8, inner 7–15 × 2–6	Outer 12–18 × 10–17, inner 13–16 × 6–8
Pistillate flower
Tepal number	6	5
Tepal size (mm)	Outer 8–14 × 6–9, inner 9–18 × 4–6.5	Outer 13–17 × 5–7.5, inner 10–14 × 5–7
Ovary size, wings excluded (mm)	12–15 × 4–5	Ca. 8 × 3
Wings on ovary body	Lateral wings 5.5–8 mm wide, abaxial wing 10–13 mm wide	Lateral wings ca. 4 mm wide, abaxial wing ca. 7 mm wide
Tip of wings	With succulent bristles	Glabrous
Distribution	Northern Vietnam	Malay peninsula