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| Begonia oyuniae M.Taram & N.Krishna in Taram, Borah, Krishna, ... et Hughes, 2020. |
Abstract
The new species Begonia oyuniae M.Taram & N.Krishna is described from Arunachal Pradesh. It belongs to Begonia sect. Monophyllon A.DC., which is a new sectional record for India. Begonia oyuniae shares the ability to produce plantlets at the leaf tip with B. vagans Craib (Begonia sect. Alicida C.B.Clarke) and B. elisabethae Kiew (Begonia sect. Parvibegonia A.DC.), but differs from the former in having glabrous tepals (versus densely glandular hairy) and 2-locular ovaries (versus 3-locular), and from the latter in having an asymmetric androecium (not globose). It differs from the two other species in Begonia sect. Monophyllon in having leaves which have sinuate to lobed margins (not entire), and which produce plantlets around the margin.
Keywords: Begonia paleacea, Begonia prolifera, Begonia sect. Parvibegonia, Namdapha National Park, Sikem, taxonomy
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| Fig. 1. Begonia oyuniae M.Taram & N.Krishna. A. Habit in situ (inset showing a leaf with more pronounced lobes) (scale bars 5 cm). B. Leaf tip with bulbils and plantlets, each with further bulbils (scale bar 1 cm). C. Staminate flower (scale bar 1 cm). D. Pistillate flower (scale bar 1 cm). E. Fruit cross section showing two locules and two placental lamellae per locule (scale bar 5 mm). F. Style and stigma (scale bar 2 mm). G. Ovary and flower bud (scale bar 1 cm). H. Androecium (scale bar 5 mm). I. Ovary with one smaller wing removed (scale bar 1 cm). J. Ovary with ripe seeds visible through the membraneous flaps in the splash cup (scale bar 1 cm). K. Inflorescence (scale bar 3 cm). A-D, I & K from M. Taram 301; E-H & J from N. Krishna 159649. (Photos: A-D, I & K,.M. Taram; E-H & J, N. Krishna) |
Begonia oyuniae M.Taram & N.Krishna, sp. nov. § Monophyllon
Begonia oyuniae belongs in Begonia sect. Monophyllon as it is a small tuberous herb with two lunate stigmas, two-locular fruit and an asymmetric androecium. Begonia oyuniae shares the ability to produce plantlets at the leaf tip with B. vagans Craib (Begonia sect. Alicida C.B.Clarke) and B. elisabethae Kiew (Begonia sect. Parvibegonia), but differs from the former in having glabrous tepals (versus densely glandular hairy) and 2-locular ovaries (versus 3-locular), and from the latter in having an asymmetric androecium (not globose). It differs from the two other species in Begonia sect. Monophyllon in having leaves which are sinuate to lobed (not entire), and which produce plantlets around the margin.
Etymology. Named after the mother of the first author, Mrs Oyun Taram for her untiring support.
M. Taram, D. Borah, N. Krishna, A.K. Pradeep, A. Amrutha and M. Hughes. 2020. Begonia oyuniae (Begonia sect. Monophyllon, Begoniaceae), A Remarkable New Species from Northeast India. Gardens' Bulletin Singapore. 72(1); 109-115.
