Ceratostylis alberteduardi P.Royen, Alp. Fl. New Guinea 2 (1979) 464, fig. 160
Type: Paymans 657 (holo CANB)
Epiphytic, about 28 cm high herb. Stems glabrous, rather stout, 7-19 by 0.12-0.15 cm, ribbed. Sheaths tubular, 0.5-5.5 cm long, acute, ribbed, glabrous. Leaves erect, coriaceous, glabrous, ensiform-subulate 6-7.5 by c. 0.2 cm, acute and falcate at tip, grooved above; leaf-sheath glabrous, 0.1-0.3 cm long, many-ribbed. Inflorescences 3 or 4. Subtending scales glabrous, narrowly ovate, 0.3-1 cm long, acute or subcaudate, ribbed. Peduncle scales and floral bract glabrous, tubular 0.3-0.5 cm long, ribbed. Peduncle 0.1-0.15 cm long, glabrous. Pedicel and ovary falcate-cylindrical, 0.04 by 0.012 cm, 5-grooved, rather densely antrorse villose. Median sepal elliptic, 0.4 by 0.22 cm, obtuse, 3-nerved, sparsely antrorsely pilose on outside at base otherwise glabrous. Lateral sepals obliquely ovate, 0.6 by 0.3 cm, 3-nerved, mentum 0.25-0.3 cm long, rather obtuse at apex, 2-lobed at tip, crested on dorsal side, grooved on underside, rather densely villose mainly on underside. Petals glabrous, obliquely lanceolate, 0.4 by 0.1 cm, acuminate, 1-nerved. Lip oblong, sigmoid in lateral view, 0.6 by 0.22 cm, at the base with erect margins, rounded, thickened in apical 0.2-0.25 cm, on upper side just below the apex with a 2-lobed callus, 2-crested on inside from base to about 1/2 of entire lip, semiglobose saccate between the thickened part and tips of crests, finely papillate in a small patch on underside of thickened apical part and along horizontal part of lower margins, crests scattered pilose along basal parts. Column obconoid, 0.1 by 0.1 cm. Arms oblong, 0.15-0.18 by 0.05 cm, rounded. Anther broadly orbicular-obovoid, 0.07 by 0.05 by 0.02 cm, truncate, base 2-lobed. Column-foot slender, 0.2 cm long, curving forward and knob-like at base. Capsule not seen. (After Van Royen, 1979).