Table 1 Comparison of Begonia caobangensis and 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