Corymborkis corymbis Thouars, Hist. Orchid.: t. 37 (1822).
Homotypic Synonyms:
Corymbis thouarsii Rchb.f., Bot. Zeitung (Berlin) 7: 886 (1849), nom. superfl.
Corymborkis thouarsii (Rchb.f.) Blume, Coll. Orchid.: 126 (1859), nom. illeg.
Heterotypic Synonyms:
Corymbis corymbosa Thouars, Hist. Orchid.: t. 37 (1822).
Corymborkis disticha Lindl., Fol. Orchid. 5: 14 (1854), nom. illeg.
Corymbis welwitschii Rchb.f., Flora 48: 183 (1865).
Corymborkis corymbosa (Thouars) Kuntze, Revis. Gen. Pl. 2: 658 (1891).
Corymborkis welwitschii (Rchb.f.) Kuntze, Revis. Gen. Pl. 2: 658 (1891).
Corymbis leptantha Kraenzl. ex Engl. in H.G.A.Engler (ed.), Pflanzenw. Ost-Afrikas, A: 83 (1895).
Corymbis bolusiana Schltr., Repert. Spec. Nov. Regni Veg. Beih. 33: 131 (1923).
Terrestrial herb 0.5–1.5 m tall.Roots elongate, c. 2 mm in diameter.Stem leafy along its length.Leaves dark green, distichous, plicate, up to 24 × 8.5 cm, lanceolate to elliptic, acuminate, the margins slightly undulate, the base clasping the stem.Inflorescences terminal and axillary, the rhachis zig-zag, often branched, several-flowered; ovary and pedicel 10–15 mm long; bracts 7–15 mm long, lanceolate to ovate.Flowers non-resupinate; sepals green, petals and lip green, turning white towards apices.Sepals 70–85 × 2 mm, linear, curling back at tips.Petals 70–80 mm long, linear-spathulate, 2 mm wide at base, 3 mm at apex.Lip 60–80 mm long, the basal part 2 mm wide, linear, the apex 6–7 mm wide, ovate.Column elongated, lying along the lip and slightly shorter than it, c. 1 mm wide.
Evergreen, usually lowland, forest, in densely shady undergrowth, often forming large colonies 100–1120 m.

Trop. & S. Africa, W. Indian Ocean