Acmadenia alternifolia Cham.

Shrubs up to 1 m tall, single-stemmed at base, lower branches variously bent, bark very rough. One stem about 25 mm diam., showed about 50 annual growth rings. Branches short, slender, lax, puberulous, rough with leaf scars, dusky brown. Branchlets short, slender, clustered, somewhat erect, densely leafy, puberulous. Leaves 6.5-12 mm long overall, 1.3-2.0 mm broad, linear or linear-lanceolate, acute with a sharp mucro, crowded, alternate, fairly erect, incurved towards the apex; margins thinly cartilaginous, minutely scabrid; petiole 1.5-2.0 mm long, 0.7 mm broad, minutely pubescent; adaxial surface flat, concave when dry, dark green, scabrid; abaxial surface with the midrib prominent and scabrid, with a single row of gland dots to either side and a few along the margins. Inflorescence terminal, sessile, crowded, each flower on a very short branchlet. Bract 5 mm long in eluding the pubescent petiole, 1.5 mm long, 0.8 mm broad, tumid, incurved, linear, acute, minutely mucronate, scabrid. Bracteoles up to five, the innermost about 3 mm long, 1 mm broad, translucent and ciliate below, narrowing above to a tumid scabrid awl-shaped point, adaxially pubescent towards the base. Calyx lobes five, 3 mm long, 1.5 mm broad translucent and crisped ciliate below, apiculate and scabrid above; apex mucronate, spreading, adaxially adpressed pubescent about the middle. Petals five, 6 mm long overall; limb 2.0-2.7 mm broad, apiculate. sparsely ciliolate, without gland dots, spreading; claw about 3 mm long, 1.1 mm broad, ciliate, somewhat pubescent and projecting inwards at the throat. Staminodes five, 0.7 mm long, glandular at the apex, glabrous. Filaments five, becoming 2.3 mm long, acicular, glabrous. Anthers five, before anthesis 1.3 mm long, 0.7 mm broad, yellow, apical gland minute. Pollen 51 µ long, 31 µ diam., ellipsoid. Disc exceeds the ovary, obvallate, green, exudes nectar. Stigma 0.5 mm diam., capitate, globose. Style 1 mm long, terete, glabrous, erect. Ovary 5-carpellate, 0.8 mm diam., glabrous, green. Fruit 5-carpellate, 12 mm long, sparsely puberulous with a few gland dots at the sides otherwise glabrous; horns 4 mm long, slightly incurved, with an immersed gland at the apex. Seed 5 mm long, 2.2 mm broad, black, shining; aril small, black on one side.