Calanthe lutiviridis P.Royen, Alp. Fl. New Guinea 2 (1979) 148, fig. 61
Type: ANU (Wade) 7261 (holo CANB; iso L, LAE)
Terrestrial, up to 70 cm high. Rhizome short. Roots fleshy, pilose. Stem none. Leaves rosulate, blade erect-patent, herbaceous, glabrous, lanceolate, 77-37 by 1.5-2.8 cm, caudate, base subrotundate, many-nerved with 4-6-stronger developed nerves, all nerves prominent on either side, margin thin, scattered denticulate, sheath glabrous, 15-21 cm long, many-nerved. Inflorescence up to 75 cm long, many-flowered. Peduncle glabrous, 3-angular, up to 64 cm long, with 3 tubular, 3-4.5 cm long scales, the latter glabrous, obliquely truncate and acuminate, many-nerved. Rachis glabrous, 24 cm long. Floral bracts glabrous, linear-lanceolate, 0.5-2.5 by 0.7-0.15 cm, acuminate, clasping and subsaccate at base, 3-nerved. Pedicels glabrous, 0.3-0.7 cm long. Ovary glabrous, fusiform or clavate, slightly curved, 0.6-1.2 cm long, 6-grooved. Median sepal glabrous, elliptic, 0.9-1 by 0.3-0.4 cm obtuse, 3-nerved with a few transverse nerves in between, bullate-rugose on outside. Lateral sepals glabrous, elliptic, 0.9-1 by 0.4-0.45 cm, subulate-apiculate at tip, 5-nerved, scattered bullate-rugose on outside. Petals glabrous, obliquely spathulate-obovate, 0.8-0.9 by 0.3-0.35 cm, obtuse, 4-nerved, margin wavy. Lip glabrous, from a short oblong, slightly boat-shaped, 0.3-0.4 cm long basal part radiating out into 3 lobes; lateral lobes oblong, 0.35-0.4 by 0.1-0.15 cm, rounded, margin wavy, median lobe 0.8 cm long, 2-lobed, each lobe linear, 0.5 by 0.1 cm, rather obtuse, spreading, between these 2 lobes a short tooth-like acumen, at base of lip on inside with a 3-lobed callus, in the extension of the shorter median lobe a short crest with wavy margin and the apical half with 2 hollows. Spur clavate, 0.4.5-0.55 cm long, slightly compressed and 2-lobed at tip. Column short and straight, 0.3 by 0.3 cm, margin, wavy, with a short, sub triangular, obtuse auricles. Anther cucullate, 0.12 by 0.15 by 0.1 cm, rounded, base retuse, apical margin revolute. Capsule not seen. (After Van Royen, 1979).
Colours: Flowers yellowish green.
Habitat: Terrestrial in montane grassland.
Flowering time in the wild: Not known
Distribution: Malesia (New Guinea, endemic).
Distribution in New Guinea: Papua New Guinea.
Cultivation: Cool growing terrestrial, keep in light position.
Note: Probably not distinct from Calanthe arfakana J.J.Sm.