From: Six new species of Begonia (Begoniaceae) from limestone areas in Northern Vietnam
 | B. circularis | B. lanternaria | B. picturata(Liu et al.[2005:]figures one and two) |
---|---|---|---|
Leaf | Â | Â | Â |
 Maculation | A pale ring ca. 1.5–2 cm from the margin against a dark green background | With digitate, green or dark green bands along major veins and leaf margin | With digitate, dark brown bands along major veins and leaf margin |
 Adaxial surface | Hispid | Puberulous | Villous-setose or tomentose-setose, bullate at base |
 Abaxial surface | Hispid on all veins | Villous on major veins | Densely shortly villous, particularly on veins |
Bract | Â | Â | Â |
 Shape | Oblong to ovate, boat-shaped, margin sparsely shortly fimbriate | Elliptic to broadly-ovate, margin glandulose-ciliate | Ovate, oblong to rounded, margin ciliate |
 Length (mm) | 6–10 × 2.5–4 | 5–9 × 4–6.5 | 4.5–15 × 4.5–8 |
Male flower | Â | Â | Â |
 Outer tepal size (mm) | 14–19 × 13–16 | 7–9 × 6–8 | 14–22 × 14–17 |
 Inner tepal size (mm) | 10–13 × 2–4 | 5.5–6 × 2–3 | 10–19 × 4.–5.5 |
 Vestiture on outer tepals | Sparsely setulose to glabrous | Glandulose-pilose | Villous-setose |
Female flower | Â | Â | Â |
 Ovary | With minute sessile glands | Glandulose-pilose | Villous-setose or hispid-setose |
 Wings on ovary | Deltate | Crescent-shaped | Crescent-shaped |