Corymborkis corymbis Thouars, Hist. Orchid.: t. 37 (1822).
Corymbis thouarsii Rchb.f., Bot. Zeitung (Berlin) 7: 886 (1849), nom. superfl.
Corymborkis thouarsii (Rchb.f.) Blume, Coll. Orchid.: 126 (1859), nom. illeg.
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).
Rhizome short, more or less vertical. Stem 30-200 cm tall, erect, more or less woody in the lower part. Leaves arranged spirally along the stem, 11-35 cm long, 3-10 cm wide, narrowly ovate to elliptic, plicate, apiculate, attenuated towards the base, margins often undulate. Inflorescence 1-4, up to 7 cm long, erect to drooping panicles with up to 5 branches, rarely with secondarily branches, up to 20-flowered. Peduncles to 9 cm. Flowers greenish-white to white, long, rather inconspicuous. Floral bract ca. 10 mm long, ovate-lanceolate, acute. Ovary longer than bract, narrowly cylindrical. Perianth segments widely spreading and elongated. Dorsal sepal 45-90 mm long, 2-4 mm wide, linear with lanceolate, acute apex. Lateral sepals of the same size, linear with oblique lanceolate, acute apex. Petals 45-90 mm long, 2-5 mm wide, linear with oblique lanceolate, acute apex, often with crenulate margins. Lip 45-90 mm long, claw tapering towards the blade; blade unguiculate, linear, canaliculate, with elliptic, acute apex and here 5-13 mm broad. Gynostemium slightly shorter than the lip, partially enveloped by the lip. Capsules 30 mm long, 6 mm in diameter.
Evergreen, usually lowland, forest, in densely shady undergrowth, often forming large colonies 100–1120 m.
As given for the genus, warm to cool growing, mycoheterotrophic orchid.
Guinea, Sierra Leone, Liberia, Ivory Coast, Ghana, Togo, Nigeria, Cameroon, Central African Republic, Sao Tomé and Principe (Såo Tomé), Equatorial Guinea (Rfo Muni, Bioko, Annobon), Gabon, the Republic of Congo, the Democratic Republic of Congo (Zaire), Sudan, Uganda, Tanzania, Angola, Malawi, Zimbabwe, Mozambique, Republic of South Africa (Transkei, Natal), Madagascar and Mascarene Is.
Orchidaceae of West-central Africa, vol. 1, Gdansk University Press Gdansk 2010; Field Guide To Ethiopian Orchids Demissew, Cribb and Rasmussen 2004; Orchids of Madagascar Hermans 2007; Field Guide to the Orchids of Northern South Africa and Swaziland McMurty, Grobler, Grobler & Burns 2008; Field Guide to the Orchids of Madagascar Cribb & Herman 2009
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Corymborkis minima P.J.Cribb, Kew Bull. 51: 355 (1996).
A herb 15 - 30 cm tall; stems erect, rarely branching, 1 - several on an ascending rhizome, leafy; roots up to 10 cm below surface, branching, up to 3 mm in diameter, thickened at apex. Leaves suberect, ovate-elliptic, acute, 5 - 10 x 1.5 - 3 cm, glabrous, prominently 3-veined. Inflorescences 1 - several, simple or sometimes branching at base, 2 - 6 cm long, terminal, horizontal or slightly dependent, rather densely many-flowered; bracts oblong-ovate, acute, prominently 3-veined, 3 - 4 mm long. Flowers erect or suberect, pale greenish with a white lip and pale brown column; pedicel and ovary 5 - 6 mm long, scabrid. Dorsal sepal linear, acute, 11 - 12 x 1.5 mm; lateral sepals slightly falcate at base, linear, acute, 10.5 - 11.5 x 1 - 1.4 mm. Petals oblanceolate, obtuse, 10 - 11 x 1.5 mm, slightly erose on apical margin. Lip canaliculate, recurved in apical quarter, linear-oblong or very slightly pandurate, 10 - 11 x 2 - 2.5 mm, erose on apical margin, basal margins fleshly thickened; callus fleshy, V-shaped on apical quarter of lip. Column terete, clavate, straight, 8 - 9 mm long; rostellum shortly bifid; anther obpyriform.
Terrestrial in riverine or old growth lowland forest on very acid sandy clay soil; sea level - 100 m
Cameroon to Equatorial Guinea