A revision and one new species of Begonia L. (Begoniaceae, Cucurbitales) in Northeast India Author Camfield, Rebecca Royal Botanic Gardens Edinburgh, 20 a Inverleith Row, Edinburgh, EH 5 3 LR, United Kingdom. RCamfield@rbge.org.uk Author Hughes, Mark Royal Botanic Gardens Edinburgh, 20 a Inverleith Row, Edinburgh, EH 5 3 LR, United Kingdom. MHughes@rbge.org.uk text European Journal of Taxonomy 2018 2018-01-19 396 1 116 journal article 10.5852/ejt.2018.396 2b95a851-e1bf-4bdd-9cce-441ddc4135d2 2118-9773 3787049 Begonia obversa C.B.Clarke [sect. Platycentrum ] Figs 41–42 Journal of the Linnean Society, Botany 25: 26 ( Clarke 1890 ) . – Type : India , Manipur , West Manipur , Makui [Mookoo], 30 Nov. 1885 , Clarke 42315A ( holo- : K000634619 ) . Citations in other publications Deb (1961: 285) , Kumar (2002: 647) , Uddin (2007: 594) , Dash (2010: 39) . Other material INDIA : Mizoram : Zotethlang, Singh 94594 (n.v.). Description Rhizomatous, monoecious herb, 15–25 cm high. Rhizome: 5–10 mm wide, tomentose. Stipules: not seen. Leaves: petiole 20–24 cm long, red tomentose; lamina broadly ovate to ovate, basifixed, base cordate with lobes not overlapping, 15–21 × 14 cm , slightly asymmetric, upper surface green, pilose all over, underside pale green, tomentose on veins, venation palmate, midrib ca 15.5 cm long; margin denticulate; very hairy, apex acuminate. Inflorescence: cymose, axillary, few; peduncle puberulous, branching twice, primary peduncle 13 –15 cm , secondary 5–10 mm , with 2– 4 female and 2– 4 male flowers; bracts lanceolate. Male flower: flowers not seen. Female flower: flowers not seen; ovary capsule oblate-obovoid, puberulous, with three subequal oblong wings; 2-locular, placentae bifid; stigma deciduous. Fruit: recurved; capsule oblate, 10–15 × 8–10 mm , puberulous; wings extending along the pedicel slightly, subequal, dorsal wing oblong rounded, 2–6 × 10–15 mm , side wings oblong, ca 4 × 10 mm . Fig. 41. Map showing the location of B. obversa C.B.Clarke specimens. Fig. 42. Illustration of B. obversa C.B.Clarke by J. Allen ( Clarke 1890 ). a. Fruit dissection. b. Diagram of fruit cross-section. Image courtesy of RBGE library and Lynsey Wilson. Distribution and phenology Manipur and Mizoram ; ca 350 m . Flowering: September to October; fruiting: November. Conservation status Data Deficient. Type exact locality of the type collection at ‘Mookoo’ is not confirmed, and we have not seen the second specimen to confirm its identity. Remarks Begonia obversa is known from two collections; the type collection from Manipur and one recent record from Mizoram which we have not been able to confirm. The subequal wings and fruit shape are quite distinct from the other species in Begonia sect. Platycentrum , as depicted in Clarke (1890) . We have interpreted Makui as being the type locality, spelt ‘Mookoo’ on the herbarium label. This species name is wrongly applied in Chauhan (2000) as the specimens cited are the syntypes for B. adscendens .