Begonia torajana D.C.Thomas & Ardi in Edinburgh J. Bot. 68(2): 246. 2011

Primary tabs

Begonia Section

  • Petermannia



  • Perennial, dioecious? herb, with erect stems, to c.150 cm tall, glabrous except for a sparse indumentum of microscopic, glandular hairs.

    Stems branched; internodes c.4-21.5 cm long, reddish.

    Leaves alternate; stipules caducous, 10-17 × 4-9 mm, ovate to oblong, with an abaxially prominent midrib that projects shortly at the apex; petioles 5.5-20 cm long, reddish; lamina 9.5-19.8 × 4.5-12 cm, basifixed, very asymmetric, ovate to elliptic, base cordate, lobes not or sometimes slightly overlapping, apex acuminate, margin biserrate, irregularly scalloped, teeth not bristlepointed, adaxial surface dark green and abaxial surface pale green, coriaceous, primary veins 4-5, actinodromous, secondary veins craspedodromous.

    Inflorescences: female inflorescences 2-flowered, with 1-2 partial inflorescences at subsequent nodes, peduncles c.2-17 mm long; male inflorescences composed of 1-6 cymosesubumbellate partial inflorescences, each with 3-5 compressed monochasia with 3-5 flowers, peduncles 9-15 mm long.

    Male flowers: pedicels c.18-20 mm long; tepals 2, whitish with pale pink veins or pinkish, 11-21 × 14-19 mm, broadly ovate to suborbicular, base cordate, apex rounded; androecium of c.52-66 stamens, yellow, filaments up to c.2 mm long, slightly fused at the base, anthers c.1-1.2 mm long, obovate, dehiscing through unilaterally positioned slits that are > 1/2 as long as the anther.

    Female flowers: pedicels 6-8 mm long; tepals 5, white, subequal, 18-27 × 12-15 mm, elliptic, sometimes irregularly serrate at the apex; ovary ellipsoid, locules 3, placentation axile, placentae bilamellate, wings 3, triangular to crescent-shaped, subequal, base rounded, apex rounded or truncate, widest subapically, style basally shortly fused, 3-branched, each stylodium bifurcate in the stigmatic region, stigmatic surface a spirally twisted papillose band, yellow.

    Fruiting pedicels up to c.6-9 mm long. Fruits slightly fleshy, ellipsoid, 15-20 × 5-7 mm (excluding the wings), indehiscent?, wing shape as for ovary, 8-10 mm wide at the widest point (in the middle part or at the apex of the ovary); seeds ellipsoidal, c.0.3-0.4 mm long, collar cells c.1/2-2/3 of the length of the seed. (Thomas, D.C., Ardi, W.H. & Hughes, M., Nine new species of Begonia (Begoniaceae) from South and West Sulawesi, Indonesia in Edinburgh Journal of Botany 68(2). 2011)


  • This is a rainforest floor species, growing on steep slopes between c.800 and 2000 m above sea level. Although this species grows best in full shade and moist conditions, it has a certain tolerance towards higher light intensities and can be found in disturbed habitats at roadsides dominated by Gleicheniaceae species.



Endemic to Indonesia, Sulawesi, South Sulawesi.

See Images for a distribution map, and specimen tab for map of point distribution data of georeferenced specimens.