Acmadenia rourkeana I.Williams

Shrubs low, much branched at base, developing long branches where mingling with taller shrubs, growing from rock crevices or amongst rocks. Branches slender, short, glabrescent, becoming almost black. Branchlets very slender, short, sparsely villous, leafy. Leaves 6-8.8 mm long, 3-4.3 mm broad, elliptic, alternate, spreading-erect; apex obtuse with a peltate gland; margins somewhat recurved, sparsely villous, gland-dotted and with about 6 peltate glands to either side of the apex; adaxial surface flat, sparsely villous, with a groove up the middle; abaxial surface with scattered raised glands; midrib villous, prominent. Inflorescence terminal, solitary or occasionally pseudo-paired; pedicel 7-20 mm long, villous with scattered peltate glands. Bract one at the base of the pedicel, 3.3 mm long, 0.8 mm broad, linear, obtuse with 5 peltate glands at the apex, ciliate; midrib puberulous with 3 peltate glands to either side. Bracteoles two at the base of the pedicel, 3 mm long, 0.7 mm broad, linear, obtuse with peltate glands at the apex, ciliate; midrib puberulous with 1-2 minute peltate glands. Calyx lobes five, 4.8 mm long, 2-2.3 mm broad, lanceolate, obtuse with 5-7 peltate glands at the apex, ciliate, wine-coloured above and projecting between the petals; midrib raised, puberulous with minute peltate glands to either side. Petals five, 9 mm long overall, white except at the midrib and throat where pink; limb 6 mm long, 6 mm broad, sub-orbicular, villous ciliate towards the apex; claw 3 mm long, 0.6 mm broad. Staminodes five, 0.3-0.5 mm long, conical, wine-coloured, apical gland c. 0.1 mm diam. Filaments five, 1 mm long, subulate, glabrous, wine-coloured. Anthers five, c. 1.1 mm long, oblong, wine-coloured; apical gland minute, 0-0.1 mm long, very hard to see. Pollen 30 µ long, 17 µ broad, ellipsoid. Disc exceeds the ovary and closes over it, flat on top, wine-coloured. Stigma 5-lobed, 0.4-0.7 mm diam., discoid, capitate. Style 0.5 mm long, erect, persistent, glabrous. Ovary 5-carpellate, 0.8 mm long, 1.3 mm broad; carpels pubescent at the apices, with peltate glands at the sides. Fruit 5-carpellate, 6 mm long, 5 mm diam.; carpels puberulous with peltate glands towards the sides, pubescent along the apical suture; horns 1.5 mm long, erect, oblong, echinulate, dark-reddened. Seed 3.2-4.3 mm long, 1.7-2 mm broad, black, shining.