Acmadenia macradenia (Sond.) Dummer

Shrubs 0.3-0.5 m tall, single-stemmed at base, dwarfed by the exposed conditions. Branches somewhat erect, fairly straight, rigid, glabrescent; bark smooth, dark brown. Branchlets fairly slender, erecto-patent, few, reddened as though varnished, sparsely villous, leafy. Leaves up to 15 mm long, 5.5 mm broad, decreasing in size towards the flowers to about 7 mm long, 3 mm broad, elliptic or oblong-elliptic, obtuse, spreading-erect, alternate; apex with a raised discoid gland; margins thick glandular-denticulate towards the apex, laxly villous below and gland-dotted; narrowing at the base to a short petiole; adaxial surface smooth, flat, shining, glabrous; abaxial surface fairly flat with a slightly raised midrib and with scattered raised glands to either side. Inflorescence pedicellate, solitary or twin, at the ends of very short branchlets often found in small groups, white flushed with pink and having the appearance of an Adenandra. Bract one, 3-4 mm long, 1.5-2.5 mm broad, elliptic or orbicular, obtuse, glabrous, viscid, erect at base of pedicel; apex with a raised discoid gland; margins thick, glandular-denticulate above, villous below; abaxial surface with up to 3 raised glands. Bracteoles two, 2.6 mm long, 0.8 mm broad, oblanceolate. acute, glabrous, viscid, at base of pedicel; apex with a raised discoid gland; margins with raised glands towards the apex, villous below. Pedicel 5 mm long, villous. Calyx lobes five, 5 mm long, 2.2 mm broad, lanceolate, acute; apex with a raised discoid gland; margins thick with raised glands towards the apex, villous below; abaxial surface glabrous with 2 or 3 raised glands in the lower half; midrib villous. The erect glandular apices project upwards between the petals within the flower. Petals five, 12 mm long overall; limb 8 mm long, 9.2 mm broad, sub-orbicular, obtuse-apiculate, villous ciliate above; adaxial surface white, midrib with a flash of red at the throat; abaxial surface reddened becoming somewhat pink towards the midrib; claw glabrous, very narrow. Staminodes five, vestigial, the disc with an obtuse apex at this point, more easily visible in dried material as a small withered point about 0.1 to 0.2 mm long. Filaments five, becoming 2 mm long, 0.3 mm diam., stout, erect, acicular, purplish or wine-coloured, glabrous. Anthers five, before anthesis 2.4 mm long, 1.3 mm broad, wine-coloured, truncate at the apex without any apparent gland; when dry a sessile semi-globose gland 0.1 diam., is visible. Disc exceeds the ovary by a long way, closing somewhat over it, dark green, flattened above, exudes nectar. Pollen 35 µ long, 17 µ broad, oblong. Stigma 5-lobed, each lobe somewhat globose, 0.5 mm diam., capitate, pale green. Style at first deflexed, becoming erect, 2.5 mm long, glabrous. Ovary 5-carpellate, 0.7 mm long, 1.2 mm diam., apices bearing raised glands. Fruit 5-carpellate, 8.5 mm long overall, 6 mm diam.; carpels glabrous, shining, sparsely scattered with raised glands; horns spreading-erect, adaxially canaliculate, glabrous. Seed not seen.