B. coursii

Planta ramosissima suffrutescens, caulibus lignoso-sarmentosis, 1,5-2 m altis. Folia petiolo glabro, gracile, 10-15 mm longo, lamina asymetrica, ovato-acuminata, basi obcordata, superne infraque glabra. Stipulae glabrae, late triangulares. Inflorescentiae mixtae, cymosae, terminales, floribus roseis, glabris. Florum MALE tepala 2, tenerrima, staminibus 20-25, filamentis connatis in columnam 1 mm longam, antheris obovalibus 2-4 mm longis. Florum FEMALE tepala 4, inaequalia, majora 7 X 6 mm, altera 6 X 4 mm; ovarium obovale, 5 X 3 mm, alis inaequalibus, ala majore 2 mm Iata, alis minoribus vix 1 mm latis; styli 3, 3 mm longi, bifidi vel trifidi. Fructi ignoti. Plant suffrutescente, very ramified; woody stems a little sarmentous, up to 1.50 to 2 m in height and 5 mm in diameter, glabrous; secondary branches very divergent. Leaves petioles glabrous, small, 10-15 mm long; blade asymmetrical, ovate, acuminum at the apex, obcorde at base, bright green and shiny above, paler green and matte below, 15-40 x 10-15 mm, glabrous on both sides; edges sometimes slightly dente; median vein marked on the upper side, projecting on the inferior face; 3-5 pairs of secondary veins visible below. Stipules triangular-elongated, glabrous. Inflorescence in subterminal, bisexual, bipedal cymes, 6-8 pink, glabrous flowers; peduncle 30-35 mm long; pedicel grele, 6-10 mm long; ovate-lanceolate bracts, acute at the apex, 6 X 5 mm. MALE flowers has 2 fine, rounded, suborbicular tepals, obcorded at the base, 8-12 - mm. Stamens 20-25, with welded fillets in column of 1 mm; obovate antheres, 2-4 mm long. FEMALE Flowers has 4 thin, unequal tepals, the largest 7 x 6 mm long, the others 6 x 4 mm. Oval obovate, 5 X 3 mm long, the large wing 2 mm wide, the other two barely 1 mm; styles 3, 3 mm long, usually bifid, sometimes trifid with a median branch poorly developed; Spiral stigmatized blade. Fruit not seen. - Pl. 18 p. 63. This Begonia very particular among the Malagasy species presnt by its vegetative apparatus some similarities with the Begonia jussiaeicarpa Warb. and B. macambrarensis Exell from Africa. The hypothesis of an allochthonous species, introduced and modified a long time ago, might not be out of the question, although the zone or this B. coursii exists in Madagascar is known by the fact of original endemisms for other groups.
Pests Diseases

• Classification: Species
• Plant Type: Shrub-like
• Botanical Section: Nerviplacentaria
• Origin: Africa, Madagascar
• Originator: Humbert ex M. Keraudren, Fl. Madagascar
• Date of Origin: 1983