Begonia

Camfield, Rebecca & Hughes, Mark, 2018, A revision and one new species of Begonia L. (Begoniaceae, Cucurbitales) in Northeast India, European Journal of Taxonomy 396, pp. 1-116 : 10

Group 6 – Leaves ovate, shallowly dentate to denticulate and asymmetric ( Fig. 4B )

1. Leaf margin denticulate .................................................................................................................... 2 – Leaf margin shallowly, broadly dentate ............................................................................................ 3

2. Plant with an erect stem, with coarse red hairs, tepals 15–25 mm long, stamens 60–80, styles 3, fruit with thick red hairs, longest wing oblong ......................................................... B. cathcartii Hook. f.

– Plant stemless, with fine hairs, tepals 5–15 mm long, stamens 15–20, styles 2, fruit glabrous, longest wing triangular ................................................................................................... B. wattii C.B.Clarke

3. Leaves with short tomentose hairs above, 5–15 cm long .................................. B. annulata K.Koch – Leaves glabrous (may have very sparse microscopic hairs) above, 10–25 cm long ....................... 4

4. Plant caulescent, styles 2 .................................................................................. B. megaptera A.DC. – Plant acaulescent, styles 3–4 ............................................................................................................ 5

5. Leaves unvariegated, primary peduncle under 10 cm, outer tepals 2–5 cm long, female flowers with 4 tepals, styles 4, fruit wingless ........................................................................... B. handelii Irmsch.

– Leaves variegated with pale spots, primary peduncle over 10 cm, outer tepals up 2 cm long, female flowers with 5–8 tepals, styles 3, fruit winged .................................................... B. beddomei Hook.

Figures

Fig. 4. Leaf tracings. A. Group 5: ovate and symmetric to slightly asymmetric leaves. B. Group 6: ovate, asymmetric and shallow dentate to denticulate leaves. C. Group 7: lanceolate (deltoid) and symmetric leaves.