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 : 8-9

Group 4 – Leaves linear to lanceolate, entire to denticulate ( Fig. 3B )

1. Plant small, up to 20 cm high, stipules 5–7 mm long, flowers with striped outer tepals ................... ................................................................................. B. hatacoa var. meisneri (C.B.Clarke) Golding

– Plant large, up to 2 m high, stipules 5–15 mm, tepals not striped .................................................... 2 2. Plant pendent, petioles <2 cm, peduncles branching many times, peduncle> 3 cm long, 20–40 stamens connective not extended, styles 2, fruit with 1 enlarged wing ............................................ 3

– Plant erect, petioles 2–10 cm long, peduncles branching only a few times, peduncle <3 cm, around 60 or more stamens with connectives extended, styles 3–4, fruit wingless or ridged ..................... 4

3. Leaves 2–4 cm wide, male flowers with 4 tepals, pedicel on female flower 1 cm ............................ ............................................................................................................. B. griffithiana (A.DC.) Warb.

– Leaves 4–11 cm wide, male flowers with 2 tepals, pedicel on female flower 2–3 cm ...................... .............................................................................................................. B. nepalensis (A.DC.) Warb.

4. Plant monoecious, styles 3, fruit spherical, with 3 locules ................................ B. longifolia Blume – Plant dioecious, styles 4, fruit rhomboid, with 4 locules ..................................... B. acetosella Craib

Figures

Fig. 3. Leaf tracings. A. Group 3: lanceolate, dentate and very asymmetric leaves. B. Group 4: linear to lanceolate, and entire to denticulate leaves.