Prev Taxon: Genus Dendrobium section Herpetophytum
Current Genus: Genus Dendrobium section Latouria
Next Taxon: Genus Dendrobium section Microphytanthe
Dendrobium eymanum
Dendrobium eymanum Ormerod, Austrobaileya 7 (2005) 184, fig. 2.
Type: P.J. Eyma 4814 (holo: AMES [specimen on the right]; iso: K, L).
Synonyms:
Roots fleshy, terete, 0.2—0.3 cm thick. Stem 5-6 leaved in upper half, terete, to 24 by 0.4—0.5 cm; internodes 0.85—3.5cm long. Leaves stiffly coriaceous, erect, elliptic, obtuse to weakly bilobed, 3—5 by 1.7—2.4 cm. Inflorescences subterminal, laxly 7—10-flowered, to 22cm long; peduncles 12—14.5 cm long, with 2—3 scattered, tubular, clasping the stem, sheathing scales 1.2—1 .4 cm long; rachis to 7.5cm long; floral bracts lanceolate-cymbiform, acute, 0.6— 0.9 cm by 0.2—0.3 cm. Flowers resupinate. Pedicel and ovary terete, towards the top weakly obconical and with low, irregular or wavy ribs, 2—2.8 cm long. Median sepal oblong, c. 1.3 by 0.41—0.5 cm; apex acute. Lateral sepals ovate-elliptic, c. 1.3 by 1.05 cm, median c. 0.5 cm wide, forming with the columnfoot a conical 0.75—0.8 cm long. mentum; median keeled; apex acute. Petals obovate-elliptic, c. 1.35 by 0.5 cm; labellum 3-lobed, c. 1.7 cm long; hypochile c. 1. 6 mm long to the tip of lateral lobes (including the 0.5 cm long ‘claw’) and 1.2 cm wide; lateral lobes obliquely obcuneate, with obtuse apex; callus of three thickly laminate keels which are most prominent between the lateral lobes, the median keel only evident apically, apices rounded and raising forward, c. 2 mm high at termination at base of epichile; epichile concave, transversely elliptic-trapeziform, subacute, c. 0.55 by 0.4 cm. Column short, stout, c. 0.2 cm long; column foot 0.75—0.8 cm long.
(after Ormerod 2005)
Colours not recorded.
Heath vegetation.. Altitude c. 3000 m.
Malesia (New Guinea)
Indonesia, Papua Province, Paniai Regency
Cool growing epiphyte.
March.
- Family Orchidaceae
- Subfamily Epidendroideae
- Tribe Dendrobieae
- Subtribe Dendrobiinae
- Genus Dendrobium
- Section Latouria
- Dendrobium eymanum
Dendrobium eymanum Ormerrod is similar to Dendrobium acutisepalum J.J.Sm. but differs in the slightly longer mentum (0.75—0.8 cm versus 0.6 cm), an oblong (versus elliptic) median sepal, a callus on the lip with glabrous, thickly laminate keels that raise up and forward at termination (versus thicker keels that are verrucose above in the upper half which do not raise forward obliquely at termination) and the transversely elliptic-trapeziform (or subtrilobate) midlobe (versus the midlobe varies from rhombic to oblong-lanceolate but is never subtrilobate).
Dendrobium eymanum is also similar to D. cynthiae Schuit., but differs in the pseudobulbs of uniform thickness, with 5 or more large internodes (versus pseudobulbs clavate with 3 large internodes). the callus ridges on the hypochile callus ridges reaching the base of the midlobe (versus not reaching the base of the midlobe), the flattened midlobe of the lip is midlobe longer than wide (versus much wider than long), and mentum 0.75-0.8 cm long (versus 0.4 cm long).
(after Ormerod, 2005)
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Dendrobium eymanum
Dendrobium eymanum Ormerod. Drawn by Paul Ormerod in Austrobaileya 7 (2005) 184, fig. 2, based on the type, P.J. Eyma 4814.