Current Genus: Genus Dendrobium section Cadetia subsection Sarcocadetia
Next Taxon: Genus Dendrobium section Calyptrochilus
Dendrobium subfalcatum
Dendrobium subfalcatum J.J.Sm., Repert. Spec. Nov. Regni Veg. 12 (1913) 30; Nova Guinea 12
Type: Gjellerup 941 (holo BO).
Synonyms:
- Cadetia subfalcata (J.J.Sm.) Schltr., Bot. Jahrb. Syst. 58 (1922) 91.
Rhizome short. Stems crowded, erect, slender, widened in upper part, sharply 4-angled, 4.25 cm long, at apex 2.6-4.3 mm diameter, 1-leaved. Leaves subfalcate, ovate-lanceolate to ovate-oblong, 5-6 by 1.3-1.55 cm, rather fleshy, apex obtuse, unequally bidentate. Inflorescences terminal from the leaf axil, fascicled, 1-flowered, spathe oblong, 0.7-1 cm long. Pedicel 0.9 cm long, triangular; ovary 0.18-0.2 cm long, sharply triangular in cross section, with low lateral ribs. Flower resupinated, c. 0.8 cm across. Dorsal sepal oblong, 0.4 cm by 2 mm, apex very shortly acuminate. Lateral sepals obliquely subovate to suborbicular, 0.37 cm by 2.7 mm, apex broadly obtuse; mentum straight, subellipsoid to subglobose, 0.2 cm long, 0.15 cm wide, broadly obtuse. Petals patent, falcate-incurved, subspathulate, much dilated at the base, 0.36 cm by at the base 1.5, in the middle 1 mm, margins erose, apex acute. Lip 3-lobed in the middle of the blade, clawed, 0.36 by 0.24 cm across the lateral lobes, between the lateral lobes with longitudinal hairy bands; lateral lobes erect, strongly obliquely ovate, rounded; midlobe much larger, dilated to the apex, 0.17 by 0.36 cm, very fleshy, in the basal part with 5 short thick keels, apex retuse, with a small rounded apicule. Column 0.17 cm long, stelidia triangular, acuminate, longer than the triangular filament; column-foot pubescent.
(after Smith, 1916).
Flower pale yellowish, lip pinkish white, midlobe yellowish white, column white, anther white with purple margins and a triangular purple spot.
Epiphyte in lowland forest. Altitude 50-100 m.
New Guinea (endemic).
Papua (Jayapura Regency).
Warm growing epiphyte.
September.
In Dendrobium sect Cadetia subsect. Pterocadetia the species Dendrobium danipense, Cadetia subfalcata and Cadetia takadui are quite similar in their flowers. They differ that in Dendrobium subfalcatum J.J.Sm. the mentum is relatively short, the hypochile inside has longitudinal hairy bands and the epichile has in the basal part 5 short thick keels, in Dendrobium danipense the mentum is relatively short, the hypochile inside and the base of the epichile are minutely hairy and the epichile has no keels, and in Dendrobium takadui the mentum is relatively long and acute, the hypochile is inside glabrous and has two short parallel lamellae, and the epichile has no keels
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Dendrobium subfalcatum
Dendrobium subfalcatum J.J.Sm., drawing J.J. Smith, based on Gjellerup 941
Dendrobium subfalcatum
Dendrobium subfalcatum J.J.Sm., drawing J.J. Smith, based on Gjellerup 941