Current Genus: Genus Dendrobium section Cadetia subsection Pterocadetia
Dendrobium triquetrum
Dendrobium triquetrum Ridl., J. Bot. 24 (1886) 322.
Type: Type: Forbes 755 (holo BM).
Synonyms:
- Cadetia triquetra (Ridl.) Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 424.
- Trichoglottis leontoglossa Ridl., J. Bot. 24 (1886) 355.
- Type: Forbes 839 (holo BM). - Dendrobium leontoglossum (Ridl.) Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 575.
- Grastidium leontoglossum (Ridl.) Rauschert, Feddes Repert. 94 (1983) 450.
- Dendrobium trigonocarpum Schltr., in K.Schum. & Lauterb., Nachtr. Fl. Deutsch. Schutzgeb. Südsee (1905) 159.
- Type: Schlechter 14224 (holo B, lost). - Cadetia trigonocarpa (Schltr.) Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 429.
Rhizome very short. Stems crowded, erect, slender, narrowing to the base, sharply 4-winged, 5-7.5 cm by 5 mm, 1-leaved. Leaves erect, lanceolate to oblong, 6-9 by 1.2-2.5 cm, coriaceous, apex acute. Inflorescences terminal from the leaf axil, 1-flowered, spathe 1.2 cm long. Pedicel and ovary 0.8 cm long, 3-winged. Flower c. 1 cm across. Dorsal sepal broadly ovate, 0.5 cm long, apex obtuse. Lateral sepals obliquely broadly ovate, 0.5 cm long, apex obtuse; mentum spur-like, cylindrical, 0.3 cm long, apex slightly dilated, minutely bilobulate. Petals about as long as the dorsal sepal, obliquely lanceolate, widened at the base, apex narrowly obtuse. Lip 3-lobed at the base of the blade, clawed, blade 0.6 by , with two lamellae originating in the centre of the base of the lateral lobes, converging on the base of the midlobe; lateral lobes obliquely oblong, erect-porrect; midlobe subquadrate-oblong, broadly obtuse. Column short, ; column-foot minutely pubescent inside.
(after Schlechter, 1905, and Ridley, 1886).
Flower greenish white, lip with reddish veins.
Epiphyte in lowland and lower montane rainforest. Altitude 100 to 900 m.
New Guinea (endemic).
Papua New Guinea (Madang, Western Highlands, and Central Provinces).
Warm growing epiphyte.
February, June, July, September.
Dendrobium triquetrum Ridl. may be recognised by the pair of curved lamellae running from the lateral lobes to the base of the midlobe. The acute leaves and the colour of the flowers are also distinctive. Ridley erroneously described the stems as 3-winged, they are clearly 4-winged in the type specimen, he moreover failed to notice that the lip is 3-lobed.
Note: Paul Ormerod (pers. comm.) has noted that the description of Trichoglottis leontoglossa by Ridley was based on two discordant elements: a poor specimen of a species of Dendrobium belonging to section Grastidium, as well as a detached flower of a Cadetia
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Dendrobium triquetrum
Dendrobium triquetrum Ridl., front view, photo Ed de Vogel, Leiden cult. 20031712 (Harris 1661), from Papua New Guinea, Central Highlands Prov.
Dendrobium triquetrum
Dendrobium triquetrum Ridl., plant habit, photo Ed de Vogel, Leiden cult. 20031712 (Harris 1661), from Papua New Guinea, Central Highlands Prov.
Dendrobium triquetrum
Dendrobium triquetrum Ridl., flower, front view, photo Ed de Vogel, Leiden cult. 20031712 (Harris 1661), from Papua New Guinea, Central Highlands Prov.
Dendrobium triquetrum
Dendrobium triquetrum Ridl., flower, oblique front view, photo Ed de Vogel, Leiden cult. 20031712 (Harris 1661), from Papua New Guinea, Central Highlands Prov.
Dendrobium triquetrum
Dendrobium triquetrum Ridl., flower, oblique lateral view, photo Ed de Vogel, Leiden cult. 20031712 (Harris 1661), from Papua New Guinea, Central Highlands Prov.
Dendrobium triquetrum
Dendrobium triquetrum Ridl., flower, oblique lateral view from above, photo Ed de Vogel, Leiden cult. 20031712 (Harris 1661), from Papua New Guinea, Central Highlands Prov.
Dendrobium triquetrum
Dendrobium triquetrum Ridl., flower, lateral view, photo Ed de Vogel, Leiden cult. 20031712 (Harris 1661), from Papua New Guinea, Central Highlands Prov.
Dendrobium triquetrum
Dendrobium triquetrum Ridl., flower, photo J.B. Comber, ex PNG, Sogeri)
Dendrobium triquetrum
Dendrobium triquetrum Ridl., drawing by H.O. Forbes on the type sheet (BM)
Dendrobium triquetrum
Dendrobium triquetrum Ridl., as Cadetia trigonocarpa (Schltr.) Schltr., drawing R. Schlechter in Repert. Spec. Nov. Regni Veg. Beih. 21 (1923) t. 148, fig. 556
Dendrobium triquetrum
Dendrobium triquetrum Ridl. , type specimen: Forbes 755 (holo BM)