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Table 1 Comparison of Begonia caobangensis and B. aequilateralis

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

  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