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 : 7

Group 1 – Leaves scalloped, lobed or incised ( Fig. 2A )

1. Leaves peltate .......................................................................................................... B. josephi A.DC. – Leaves basifixed ................................................................................................................................ 2

2. Leaves deeply incised up to ¾ of way to petiole base ...................................................................... 3 – Leaves scalloped, lobed or shallowly incised up to ¼ of way to petiole base .................................. 6

3. Plant with main stem, leaves rarely over 20 cm long, inflorescence from leaf axils ........................ 4 – Plant stemless, leaves at least 20 cm long, inflorescence from rhizome ........................................... 5

4. Plant up to 100 cm high, generally hirsute, petiole 10–30 cm long, flowers and fruit red setose ..................................................... B. difformis (Irmsch.) W.C.Leong, C.I Peng & K.F.Chung

– Plant up to 200 cm high, generally glabrous, petiole 5–15 cm long, flowers and fruit glabrous ................................................................................................................ B. sikkimensis A.DC.

5. Petiole with sparse hairs, lobes branched with acuminate tips, male flowers with 4 tepals, female flowers with 4–6 tepals, main wing up to 3 cm long, oblong side wings 3–5 mm long that do not extend along pedicel .......................................................................... B. koelzii R.Camfield sp. nov.

– Petiole with dense hairs, lobes linear with caudate tips, male flowers with 2 tepals, female flowers with 2 tepals, main wing up to 2 cm long, curved side wings 1–2 mm long that extend along pedicel ........................................................................ B. shilendrae Rekha Morris & P.D.McMillan

6. Stem, petioles and tepals glabrous .................................................................................................... 7 – Stem, petioles, and tepals with hairs ................................................................................................. 8

7. Leaves broadly dentate (scalloped), anther connective not extended, styles 2 .. B. megaptera A.DC. – Leaves acutely dentate, anther connective extended, styles 3 ......................... B. sikkimensis A.DC.

8. Stipules <15 mm long, flowers yellow, styles 3, fruit capsule <1 cm long ..... B. flaviflora H.Hara – Stipules> 15 mm long, flowers white to pink, styles 2, fruit capsule> 1 cm long .......................... 9

9. Leaf upper surface hispidulous on veins only, outer tepals red setulose on reverse, fruit capsule red setulose, longest wing curved and up to 3 cm long ............................................................................ ................................................................ B. difformis (Irmsch.) W.C.Leong, C.I Peng & K.F.Chung

– Leaf upper surface hirsute/strigose or verrucose all over, outer tepals tomentose on reverse, fruit capsule glabrous or with tomentose, longest wing oblong and up to 2 cm long .. B. palmata D.Don

Figures

Fig. 2. Leaf tracings. A. Group 1: scalloped, lobed or incised leaves. B. Group 2: ovate, asymmetric, and entire leaves.