Sunday, May 28, 2017

[Botany • 2017] Begonia ignita • A New Species (sect. Petermannia, Begoniaceae) with Orange Flowers from Sulawesi, Indonesia


Begonia ignita  C.W.Lin & C.I Peng

ABSTRACT
 Begonia ignita C.W.Lin & C.I Peng, a new species of Begonia sect. Petermannia from Sulawesi, Indonesia, is here described and illustrated. It is distinct from other species in Begonia section Petermannia by a character combination including a procumbent stem ascending only at the apex, symmetric or subsymmetric leaves, the presence of a pale band or maculation running parallel to the leaf margin, and orange tepals. A detailed comparison with a morphologically similar species, the Sulawesi endemic Begonia mendumiae M.Hughes, is provided. 

Keywords. Begonia ignitaBmendumiae, Indonesia, new species, Sulawesi

Fig. 2. Begonia ignita C.W.Lin & C.I Peng.
A, B. Habit, showing variation in leaf colours. C, D. 5-tepaled pistillate flower (occasional), face and side views. E. Inflorescence, showing 2-tepaled staminate flowers. F. Staminate flower, face view. G. 4-tepaled pistillate flower in inflorescence. H. 2-tepaled pistillate flower (occasional). I. Cross section of ovary showing axile, bilamellate placentae. (Photos: Y.-Z. Siaw) 

Begonia ignita C.W.Lin & C.I Peng, sp. nov. § Petermannia 

This species is distinct from other species in Begonia section Petermannia by a character combination including a procumbent stem ascending only at the apex, symmetric or subsymmetric leaves, the presence of a pale band or maculation running parallel to the leaf margin, and orange tepals.
 TYPE: Collected in Indonesia, Sulawesi, precise locality unknown, grown in cultivation in Bogor Botanic Gardens and vouchered on 9 October 2016 as Wisnu H. Ardi WI 117 (holotype BO; isotype SING). (Fig. 1, 2)

Distribution. Only known from cultivation; likely endemic to Sulawesi (see Notes). 

Etymology. The specific epithet refers to the flame-coloured tepals (Latin: igneus – flame-coloured).


C.-W. Lin, D.C. Thomas, W.H. Ardi and C.-I Peng. 2017. Begonia ignita (sect. Petermannia, Begoniaceae), A New Species with Orange Flowers from Sulawesi, Indonesia. Gardens’ Bulletin Singapore. 69(1); 89–95. DOI: 10.3850/S2010098116000081

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