Knoxia sumatrensis  

Subshrubby perennial to 1 m tall. Stems often branched, sparsely to densely tomentose above, glabrescent below. Leaves oblong- or ovate-lanceolate, 4−10 by 1−4 cm, base acute to attenuate or obtuse, apex acute to acuminate, above sparsely pubescent, below pubescent, particularly on the veins, with 5-12 pairs of lateral veins; petioles (5−) 10−20 (−30) mm long; stipules 3.5−10 (−15) mm high, with typically 4−6 bristles 5−10 mm long. Inflorescence thyrso-paniculate, often corymbiform and rather lax; cymes much elongating in fruit; peduncle 2−7 (−10) cm long. Flowers shortly pedicellate to subsessile but pedicels up to c. 2 mm in fruit. Calyx slightly unequal, 1 lobe to c. 0.7 mm long, the others < 0.5 mm. Corolla white, yellowish-white, pinkish-white, pale rose, pale lilac or pale blue-violet, glabrous outside; tube 2−6 mm long, pubescent inside at least around the throat, cylindrical in short-styled and widened above in long-styled morph; lobes 1−3 mm long. Stamens  2−4 mm long and exserted in short-styled morph, included in the widened upper corolla tube portion and 1.5−2 mm in long-styled morph; anthers 0.5−1 mm. Ovary to 1−1.5 mm high, ovoid to oblong; style exserted and 5−10 mm long in longistylous flower, included and 1−5 mm long in brevistylous flower; stigma lobes ca. 0.5 mm long. Fruit greyish to dark brown, 1−3 by 0.8−2.4 mm, faintly to distinctly quadrangular; mericarps often remaining (partially) united, leaving behind the column-like, apically 2-forked carpophore, but sometimes splitting from the base into 2 one-seeded units.