Species Information - Dendrobium xanthocaulon

Dendrobium xanthocaulon Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 475; 21 (1923) t. 160, fig. 601.

Type: Schlechter 18915 (B, lost; NSW); 19282 (B, lost; AD, AMES, BM, BO 3x, G, K, L 2x, MO, S).

Synonyms:

• Diplocaulobium xanthocaulon (Schltr.) A.D.Hawkes, Lloydia 20 (1957) 130.

Rhizome very short, roots elongated, filiform, flexuose, glabrous. Pseudobulbs crowded, 1-leaved, slender, thickened to the base, ancipitous, 15-26 by 0.7-1.2 cm (at the base). Leaves ligulate, 14-18 by 2.3-3 cm, base cuneate, apex subacute, coriaceous. Inflorescences arising in succession from the apex of the pseudobulb, 1-flowered; spathe laterally compressed, c. 2.5 cm long, acute to acuminate. Pedicel and ovary 11 cm long, slender, glabrous. Flower resupinated, 7-8 cm across. Dorsal sepal narrowly lanceolate, narrowing to the elongated apex, 3-4 cm long. Lateral sepals obliquely narrowly lanceolate, narrowing to the elongated apex, abruptly widened at the base, 3-4 cm long, mentum 4 mm long, obtuse. Petals obliquely linear-lanceolate, narrowing to the elongated apex, c. 3-3.8 cm long. Lip 3-lobed in basal fourth, 1.4 by 0.43 cm, cuneate at the base, with two parallel keels extending from the base of the lip to the base of the blade of the midlobe; lateral lobes very short, obliquely triangular, obtuse; midlobe reniform with an obcuneate-ligulate claw, the blade c. 4.3 by 5 mm, margins of the blade undulate-crenate, apex apiculate. Column short, clinandrium 3-lobulate, the median lobule tooth-like, acute, the laterals obtuse; column-foot c. 0.4 cm long. Anther cucullate, glabrous.
(after Schlechter, 1912).

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