Apatophyllum olsenii Mcgill.

Shrub to 1 m; branchlets glabrous. Leaves scarcely petiolate, linear, ±concave, 8-22 mm long, 0.7-1.2 mm wide; stipules subulate, entire, 0.2-0.3 mm long. Pedicels 0.8-1.5 mm long; bracteoles 0.5-0.6 mm long. Sepals ovate, acuminate, 0.6-0.7 mm long. Petals deltoid, 0.9-1 mm long. Staminal filaments linear, 0.3 mm long; anthers 0.2 mm long. Disc nearly flat. Ovary obconical, immersed in disc; style 0.2 mm long. Capsule obovoid, slightly compressed, 7-7.5 mm long, 2.5-4.5 mm wide. Seeds sub-cylindrical, umbonate, 4.5 mm long, 2 mm wide; testa finely ribbed, dark purplish-brown.

Growing on a granitic ridge in open forest.