Isolona ghesquierei Cavaco & Keraudren

Tree up to 15 m high; d.b.h. to 15 cm; young branches drying black, smooth, glabrous; old branches dark grey, striate, glabrous. Petioles 6-9 mm long, 1 mm in diameter, glabrous, leaf lamina inserted on side, weakly grooved adaxially. Leaf lamina (6-)9.5-16 cm long, (2-)3-6.5 cm wide, length:width ratio 2-3, elliptic to obovate, rounded, glabrous, base acute to broadly cuneate, apex acuminate, acumen 5-15 mm long; midrib glabrous on both sides; secondary veins 7-11 pairs, uniformly curving upwards, glabrous. Rhipidium 1, on leafy branches. Flowering pedicels 4-10(-16) mm long, 1-1.5 mm in diameter, very sparsely covered with short appressed hairs. Lower bracts 2-3, ca. 0.5 mm long, ca. 0.5 mm wide, glabrous, margins sparsely covered with short appressed hairs. Upper bract absent. Sepals ca. 2 mm long, ca. 3 mm wide, length:width ratio ca. 0.6, depressed ovate, base truncate, apex cuspidate, glabrous, pressed against tube, falling in fruit; margins sparsely covered with short appressed hairs. Corolla dark red at anthesis; tube 6-11 mm long, 4-6 mm in diameter, lobe:tube ratio 4-8, glabrous; lobes 15-45 mm long, 5-11 mm wide, length:width ratio 2.5-4, narrowly elliptic to elliptic, narrowed at base, apex acute with rounded tip, glabrous, membraneous when dried, wavy and pointing downwards, margins sparsely covered with short erect hairs. Receptacle ca. 4 mm in diameter. Stamens ca. 1.5 mm long; connective shield ca. 0.1 mm long, glabrous, those of innermost stamens extended over adjacent ovary wall. Ovary ca. 2 mm long ca. 1.5 mm wide; stigma ca. 2 mm in diameter, glabrous to very sparsely covered with short appressed hairs. Fruiting pedicels ca. 10 mm long, 4-5 mm in diameter, woody, glabrous. Fruits 4-7 cm long, 4-5 cm in diameter, length:width ratio 1-1.5, globose to ovoid, smooth, glabrous, green; pericarp ca. 4 mm thick. Seeds 15-19 mm long, 8-10 mm in diameter, ellipsoid; testa smooth, light brown; raphe not thickened, darker brown; hilum 4-6 mm long, 3-4 mm wide, elliptical.