Chiloschista phyllorhiza (F.Muell.) Schltr., Bot. Jahrb. Syst. 56: 492 (1921).
Sarcochilus phyllorhizus F.Muell., Fragm. 5: 201 (1866); Thrixspermum phyllorhizum Rchb.f., Beitr. Syst. Pflanzenk. 71 (1871). Type: Ad promontorium Cape York, E. Daemel s.n. (holo MEL; iso W).
Altitude: 0-200 m.
Also occurs in Indonesia and New Guinea.
Leafless epiphytic or lithophytic herb forming small clumps. Roots numerous, radiating, flattened, 10-20 cm x 0.6-0.1 cm, grey-green to dark green, roughened. Stems inconspicuous, less than 0.5 cm long. Leaves absent. Inflorescence an axillary raceme, arching, 50-150 mm long, thin, rigid, bearing flowers in spasmodic bursts. Flowers numerous, resupinate, erect to porrect, star-shaped, 10-14 mm x 10-14 mm, crystalline white with yellow labellum. Sepals and petals widely spreading. Dorsal sepal free, erect, obovate to ovate, 4-6 mm x 3-4 mm. Lateral sepals similar to dorsal sepal, divergent, 4-6 mm x 3-4 mm, bases fused to column foot. Petals ovate, 4-5 mm x 3-4 mm. Labellum dissilimar to sepals and petals, 2.5 mm long, hinged to apex of column foot, 3-lobed; lateral lobes 2 mm long, erect; midlobe 1 mm long, incurved, fleshy, yellow, densely hairy. Column 1.5 mm long. Column foot 2 mm long, at right-angles to column. Both column and column foot with reddish-purple markings on inner surface. Capsules porrect, dehiscent.
Occurs in rainforest margins and on sheltered ridges and slopes growing on trees in swamps and streamside vegetation. The roots shine when wet but these plants are generally inconspicuous and easily overlooked. The flowers last for one to two days, sometimes closing at night and reopening the next day, and are pleasantly fragrant. Flowering occurs in sporadic bursts, with plants in the same area flowering simultaneously.
Flowering period: November-February.