90 
Card. Bull. Singapore 69(1) 2017 
A very attractive orange-flowered Begonia , claimed to be of likely Sulawesi 
origin by some growers, has recently entered into cultivation inside and outside of 
Indonesia. It is immediately distinct from all other known Sulawesi species in its 
symmetric or subsymmetric leaves and orange or pale tangerine to vermilion tepals. In 
this study, we describe this species using measurements of herbarium specimens made 
from living plants in cultivation. In addition to the full taxonomic account, colour 
plates, line drawings, and a comparison to a phenetically similar species are provided 
to aid in identification. 
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) 
Plant perennial, monoecious. Stem procumbent and rooting at nodes, ascending at the 
apex, olive to magenta, 8-20 cm long, 4-6 mm across, glabrous, internodes 0.5-5 cm 
long; stipules widely ovate-triangular, 8-12 mm long, c. 6 mm wide, hyaline, reddish, 
strongly keeled, margin entire, apex aristate, arista c. 2.5-4 mm long. Leaves 5-10, 
held horizontally; petiole terete, 3.5-8 cm long, 3.5-6 mm across, olive-red to crimson, 
sub-appressed sparsely velutinous, slightly grooved adaxially; lamina cordiform to 
widely cordiform, basifixed, symmetric or subsymmetric, cordate at base, margin 
slightly undulate and distantly denticulate, glabrous, apex acuminate, 7-12 cm long, 
6.5-11 cm wide, basal lobes equal or subequal, to 2.5 cm long, thickly chartaceous, 
adaxially dark olive-green to dark maroon, embellished with a silvery green band 
(sometimes with irregular spots of variable sizes between veins) running parallel to the 
margin, veins red towards base; slightly rugose between primary veins; abaxially pale 
red to magenta; venation palmate-pinnate, midrib conspicuous, 6-9.5 cm long with c. 
3 pairs of major lateral veins, each branching dichotomously. Inflorescence terminal, 
bisexual, protogynous, cymose-paniculate, 13-22 cm long; bracts magenta to pale 
rosy-brown, hyaline, persistent, widely ovate, (4-)8-12 mm long, (2-)4-7 mm wide, 
decreasing in size towards the more distal inflorescence nodes, aristate at apex, arista 
3^1 mm long, margin entire; pistillate flowers produced on up to 3 subsequent basal 
nodes of the inflorescence, usually solitary or sometimes together with 1 staminate 
flower; staminate flowers usually only produced in distal inflorescence part, up to 15, 
in several (1—)2—3-flowered compressed monochasial partial inflorescences borne on 
short lateral branches (0.1-2 cm), at the most distal nodes sometimes reduced to a single 
flower, erect or ascending, reddish to crimson, glabrous. Staminate flower: pedicel 
11-18 mm long, glabrous; tepals 2, orange or pale tangerine to vermilion, glabrous, 
widely ovate to suborbicular, margin entire, base rounded, 10-15 mm long, 9-11 mm 
wide; androecium subzygomorphic, stamens 35^15, yellow, filaments shortly fused 
