Acmadenia trigona Druce

Shrubs 0.3-0.4 m tall, weak, semi-decumbent, single-stemmed at base. Branches few, slender, short, glabrous, smooth, bark brown, leaf scars not prominent. Branchlets slender, short, minutely puberulous, reddened, not much hidden by the leaves. Leaves 10-17 mm long, 1.5-2.0 mm broad, linear-lanceolate, acute, mucronate, glabrous, opposite, decussate, sub-imbricate or distant, erect or spreading, somewhat complicate when dry; margins narrowly cartilaginous, somewhat scabrid, villous-ciliate becoming eciliate; adaxial surface from convex to deeply canaliculate; abaxial surface rounded, midrib prominent, gland-dotted to either side; narrowed below to a short petiole. Inflorescence solitary, terminal and in the axils of the uppermost leaves, 20-27 mm diam., pink. Bracts on axial flowers, two, above two rudimentary leaves, 2 mm long, 1.2 mm broad, ovate or lanceolate, acute, ciliolate, sparsely pubescent adaxially, otherwise glabrous; margins broadly translucent, 1 or 2 gland dots near the midrib. Bracts on terminal flowers exactly like a pair of leaves 15 mm long with convex adaxial surface, villous ciliate. Bracteoles two, 3.5-5.9 mm long, 1.6-1.8 mm broad, lanceolate, acute with a red tip, glabrous, ciliolate or ciliate, margins translucent, 2 rows of gland dots along the midrib. Calyx lobes five, 6.0-7.5 mm long, 2.3-2.7 mm broad, lanceolate, acute, ciliate, adaxially thinly pubescent above, otherwise glabrous; abaxial surface rounded, multi-gland-dotted, shining, coloured; margins broadly translucent below. Petals five, 16 mm long overall; limb 10 mm long, 6 mm broad, elliptic, acute, apiculate, glabrous multi-gland-dotted on the underside, pink, spreading; claw 6 mm long, 1.8 mm broad, narrowing to the base, glabrous, bulged inwards at the throat closing the tube. Staminodes five, 1 mm long, glabrous, apex glandular acute. Filaments five, becoming 1.7 mm long, acicular, glabrous, incurved. Anthers five, 2.1 mm long, 1 mm broad, yellow; apical gland minute, pointed, about twice the size of a grain of pollen. Pollen 53 µ long, 31 µ diam., elliptic, turgid when fresh or 58 µ long, 25 µ diam., oblong, shrunken, possibly having been sucked out by a species of thrips. Disc dome-shaped, closes over the ovary to meet the stigma, not shining, pale green, exudes nectar at base of filament. Stigma 0.6 mm diam., capitate, pale green. Style becoming 1.5 mm long, glabrous, erect. Ovary 5-carpellate, 1.1-1.3 mm long, 1-1.1 mm diam., glabrous, apices emarginate. Fruit 5-carpellate, 7 mm long, 4.5 mm diam., entirely surrounded by the persistent calyx lobes, glabrous, gland-dotted mainly towards the margins; horns ±1 mm long, erect, emarginate Seed 5 mm long including the white aril, 1.8 mm broad, black, shining.