Species Information - Dendrobium spenceanum

Dendrobium spenceanum Ormerod, Austrobaileya 7 (2005)187, fig. 4.

Type: L.J. Brass 13324 (holo: AMES).

Synonyms:

Epiphytic herb. Rhizome abbreviated. Roots terete, relatively fleshy, to 0.18 cm thick. Stems unifoliate, when young c. 1.3 by 0.6 cm, when older fusiform, c. 2. by 0.55 cm. Leaves stiffly coriaceous, oblong-elliptic, c. 3.5 by 1.3 cm; apex acute. Inflorescences pseudoterminal, 1-flowered, c. 2.7 cm long; sheathing scales c. 0.25 cm long; floral bracts c. 0.2 cm long. Flowers c. 1.1 cm long. Pedicel and ovary weakly ribbed, narrowly clavate, glabrous. Median sepal elliptic, c. 1.3 by 0.65 cm; apex obtuse. Lateral sepals broadly elliptic, c. 1.2 by 1.1 cm, forming with the columnfoot a c. 0.5 cm long, bluntly conical mentum; apex obtuse. Petals obovate, minutely apiculate c. 1.2 by 0.7 cm wide. Lip 3-lobed, flabellate-obdeltate, c. 1.6 by 1.7 cm; callus c. 9mm long, thickly 3-keeled in apical third, the lateral keels weakly pronounced at the base, the midkeel most pronounced apically; lateral lobes broadly obovate subquadrate, rounded, c. 0.65 cm wide (measured obliquely in free part); epichile transversely oblong-bilobulate (each side obliquely subquadratic), deeply emarginate, c. 0.3 by 0.7 cm. Column semiterete-conical, c. 0.25 cm long; column foot c. 0.5 cm long.
(after Ormerod 2005)

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