Prev Taxon: Genus Dendrobium section Herpetophytum
Current Genus: Genus Dendrobium section Latouria
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Dendrobium forbesii
Dendrobium forbesii Ridl., J. Bot. 24 (1886) 323.
Type: Forbes 634 (syn BM); Barclay s.n. (Jobi I.) (syn BM).
Synonyms:
- Latourorchis forbesii (Ridl.) Brieger, in Schltr., Orchideen, ed. 3, I/A (1981) 727.
- Latourea forbesii (Ridl.) Brieger, in Schltr., Orchideen, ed. 3, I/A (1981) 727, but generic name not accepted.
- Sayeria forbesii (Ridl.) Rauschert, Feddes Repert. 94 (1983) 467.
- Dendrobium forbesii Ridl. var. praestans Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 497; 21 (1923) t. 169, fig. 631.
- Type: Schlechter 16913 (B, lost); 18513 (B, lost; iso AMES, BO, E, K, L 2x, MO). - Dendrobium ashworthiae O'Brien, Gard. Chron. (1901, I) 86, fig. 36.
- Type: Ashworth cult. s.n. (Micholitz) (New Guinea) (holo K, iso? HBG ). - ?Dendrobium eustachyum Schltr., Bot. Jahrb. Syst. 58 (1923) 100.
- Type: Moszkowski 103 (syn B, lost); 187 (syn B, lost). - ?Sayeria eustachya (Schltr.) Rauschert, Feddes Repert. 94 (1983) 466.
A large epiphytic herb. Pseudobulbs clustered, clavate, up to 32 by 1.6-2.5 cm, 4-6-noded below leaves, orange when dry, 2-leaved at apex. Leaves coriaceous, spreading, elliptic or oblong-elliptic, obtuse or rounded at apex, 9-19 by 4.7-11 cm, shortly and broadly petiolate. Inflorescence erect, apical, 15-30 cm long, 7-20-flowered; peduncle almost covered by large inflated pale green sheaths; bracts large, lanceolate, acuminate or acute, up to 3.8 by 1.3 cm. Flowers large, attractive; pedicel and ovary setose, 4 cm long. Dorsal sepal lanceolate, acuminate, 2.7-3.2 by 1 cm, scarcely hairy on outer surface; lateral sepals obliquely lanceolate, acuminate, 3-3.6 by 1.2-1.6 cm, almost glabrous but with broad lacerate keels on mid vein; keel 2-3 mm broad; mentum incurved-conical, 1-1.3 cm long. Petals obovate-spathulate, apiculate, 3-3.5 by 1.6-2.3 cm, margins undulate. Lip 3-lobed, 2-2.6 by 2.7-3 cm; side-lobes smaller than midlobe , erect, oblong, truncate; midlobe transversely oblong with a triangular apical lobule; callus 3-ridged, with a 4 mm long free apex. Column short, 2.5 mm long, somewhat erose at apex; foot incurved, 1-1.2 cm long.
(after Cribb, 1983).
Flowers pure white or creamy white sometimes with purple on side lobes of lip.
Epiphyte in montane forest. Altitude 900-1500 m.
New Guinea.
Papua New Guinea (Central Highlands and Northern mountain ranges, including the Torricelli Mountains).
Intermediate growing epiphyte.
October to December.
- Cribb, P.J. 1983. Kew Bull. 38: 245, fig. 1F, G, pl. 11C, D, map 2.
- Reeve, T.M. 1981. Orchadian 6: 286, fig.
- Schlechter, R. 1923. Repert. Spec. Nov. Regni Veg. Beih. 21: t. 169, fig. 631.
Dendrobium forbesii Ridl. is readily recognised by its broad petals, sepals which are almost glabrous and lateral sepals with a broad lacerate keel on the mid-vein.
(after Cribb, 1983).
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Dendrobium forbesii
Dendrobium forbesii Ridl., flower, oblique front view, photo Ed de Vogel, based on Leiden cult. 20031919 (de Vogel & Vogel), from Papua New Guinea, Oro Prov.
Dendrobium forbesii
Dendrobium forbesii Ridl., habit, photo Roy. Bot. Gard. Edin., based on Edinburgh cult. C4609
Dendrobium forbesii
Dendrobium forbesii Ridl., inflorescence, photo A. Vogel, based on Leiden cult. 32312
Dendrobium forbesii
Dendrobium forbesii Ridl., flower, photo D. Titmuss, based on P. Spence cult.
Dendrobium forbesii
Dendrobium forbesii Ridl., photo John Cara, plant habit, cult, from PNG.
Dendrobium forbesii
Dendrobium forbesii Ridl., photo John Cara ,inflorescence, cult, from PNG.
Dendrobium forbesii
Dendrobium forbesii Ridl., photo John Cara, flower, front view, cult, from PNG.
Dendrobium forbesii
Dendrobium forbesii Ridl., photo John Cara, flower, front view, cult John Cara, from PNG.
Dendrobium forbesii
Dendrobium forbesii Ridl., photo John Cara, flower, front view, cult John Cara, from PNG.
Dendrobium forbesii
Dendrobium forbesii Ridl., plant habit, photo Ed de Vogel, based on Leiden cult. 20030705 (de Vogel & Vogel), from Papua New Guinea, Central Prov.
Dendrobium forbesii
Dendrobium forbesii Ridl., inflorescence, photo Ed de Vogel, based on Leiden cult. 20030705 (de Vogel & Vogel), from Papua New Guinea, Central Prov.
Dendrobium forbesii
Dendrobium forbesii Ridl., flower, front view, photo Ed de Vogel, based on Leiden cult. 20031919 (de Vogel & Vogel), from Papua New Guinea, Oro Prov.
Dendrobium forbesii
Dendrobium forbesii Ridl., centre of flower, front view, photo Ed de Vogel, based on Leiden cult. 20031919 (de Vogel & Vogel), from Papua New Guinea, Oro Prov.
Dendrobium forbesii
Dendrobium forbesii Ridl., flower, front view, photo Ed de Vogel, based on Leiden cult. 20032241 (de Vogel et al.), from Papua New Guinea, Western Highlands Prov.
Dendrobium forbesii
Dendrobium forbesii Ridl., flower, lateral view, photo Ed de Vogel, based on Leiden cult. 20032241 (de Vogel et al.), from Papua New Guinea, Western Highlands Prov.
Dendrobium forbesii
Dendrobium forbesii Ridl., drawing John Cara, plant habit, flower analysis, from PNG.
Dendrobium forbesii
Dendrobium forbesii Ridl. var. praestans Schltr., drawing John Cara, plant habit, flower analysis, from PNG.
Dendrobium forbesii
Dendrobium forbesii Ridl., drawing by S.P. Hillier in Kew Bull. 38 (1983) 246, fig. 1 F, G
Dendrobium forbesii
Dendrobium forbesii Ridl. (as Dendrobium forbesii Ridl. var. praestans Schltr.), drawing R. Schlechter in Repert. Spec. Nov. Regni Veg. Beih. 21 (1923) t. 169, fig. 631
Dendrobium forbesii
Dendrobium forbesii Ridl. var. praestans Schltr. (= Dendrobium forbesii Ridl.), detail of isosyntype specimen: Schlechter 18513 (L)
Dendrobium forbesii
Dendrobium forbesii Ridl. var. praestans Schltr. (= Dendrobium forbesii Ridl.), isosyntype specimen: Schlechter 18513 (L)
Dendrobium forbesii
Dendrobium forbesii Ridl., watercolour painting John Cara, flower analysis, from PNG.