Ypsilopus viridiflorus P.J.Cribb & J.Stewart, Kew Bull. 40: 417 (1985).
Rangaeris viridiflora (P.J.Cribb & J.Stewart) Szlach., Ann. Bot. Fenn. 40: 69 (2003).
Pendent monopodial epiphytic plants 6-27 cm long. Stem very short, entire, covered by leaf sheaths. Leaves leathery, distichous, 7-10, often falcate, bilaterally compressed and iris-like, linear, acuminate, up to 24 x 0-5 cm; articulated obliquely to conduplicate basal sheath up to 2-5 cm long. Inflorescences 1-several, clustered at base of plant, pendent, 1-2-flowered, peduncle wiry, 2-5 cm long; bracts elliptic-ovate, acute, 3 x 1-5 mm. Flowers pale yellowgreen or whitish green; ovary and pedicel scabrid, 5-7 mm. Sepals lanceolate, acuminate, 7-9 x 1-5-2 mm. Petals similar but slightly shorter. Lip lanceolate, acuminate, 7-8 x 2 mm; spur slender, cylindrical, incurved, 15-18 mm long. Column short, suberect, 1 mm long; stigma excavate; rostellum bifid, each lobe linear, decurved; pollinia 2, ovoid; stipes Y-shaped; viscidium one, oblong.
Epiphyte on branches in montane forest; 2100-2350 m.
As given for the genus.
Tanzania (Mt. Meru, W. Usambara Mts.)
WCSP (2017). 'World Checklist of Selected Plant Families. 15.03.2017; http://apps.kew.org/wcsp/
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