Monodora zenkeri Engl.

Lianescent tree to 6 m tall; d.b.h. unknown; outer bark dark greyish-brown with pale brown lenticels; young branches drying black, glabrous, rarely sparsely covered with short appressed hairs; old branches greyish to brown, with sometimes sparsely distributed white lenticels, glabrous. Petioles 2-4 mm long, 0.9-1.2 mm in diameter, glabrous, leaf lamina inserted on side, grooved adaxially. Leaf lamina 10-15 mm long, 8-14 cm long, length:width ratio 2.5-3, narrowly obovate to obovate or narrowly elliptic to elliptic, base rounded to obtuse, apex acuminate, acumen 3-6 cm long, papyraceous when young becoming coriaceous, glabrous; midrib raised but sunken towards the base, glabrous on both sides; secondary veins 10-13 pairs, uniformally curving upwards, glabrous. Flowers single, extra axillary or sometimes leaf-opposed, pendulous. Flowering pedicels 28-50 mm long, 0.5-1 mm in diameter, sparsely covered with short erect hairs. Upper bract inserted halfway up to subapically on the pedicel, 11-20 mm long; 10-13 mm wide, length:width ratio 1-1.4, broadly ovate to ovate, base decurrent, apex rounded to acute, glabrous, pale green; margins straight to slightly undulate, sparsely covered with short erect hairs. Sepals 11-17 mm long; 7-10 mm long, length:width ratio 1.5-2, ovate, base truncate-cordate, apex acute, covered with short erect hairs all over and on both sides, pale green; margins straight, covered with short erect hairs. Outer petals 35-45 mm long, 20-28 mm wide, length:width ratio 1.5-2, ovate, base truncate with two small lobes, apex acute to obtuse, glabrous to sparsely covered with short erect hairs on both sides, white or pale green tinged dark red; horizontally spreading, margins straight, covered with short erect hairs. Inner petals 9-13 mm long, 13-16 mm wide, length:width ratio 0.7-0.9, clawed triangular, base truncate to cordate, apex acute, glabrous inside, covered with short erect hairs in center outside, pale green with red spots; central parts of lamina appressed over the receptacle, distal parts reflexed outwards; margins straight, folded outwards, densely covered with short curly hairs; claw 4-7 mm long; 3-5 mm long, claw:inner petal ratio 0.3-0.5, glabrous, arched inwards. Receptacle ca. 4 mm in diameter, convex. Stamens in 9-10 rows, 0.9-1.1 mm long; connective shield ca. 0.2 mm long, covered with short erect hairs, those of innermost whorl not elongated over ovary wall. Ovary ca. 2 mm long, ca. 1 mm wide; stigma 1.5-2 mm in diameter, sparsely covered with short erect hairs. Fruits unknown.