Species Information - Dimorphorchis beccarii

Dimorphorchis beccarii (Rchb.f.) Kochyan & Schuit., Phytotaxa 161 (2014) 64

Type: Beccari s.n.

Synonyms:

• Arachnis beccarii Rchb.f., Bot. Centralbl. 28 (1886) 343
• Vandopsis beccarii (Rchb.f.) J.J.Sm., Nova Guinea 8, 1 (1909) 122
• Vanda muelleri Kraenzl., österr. Bot. Zeitschr. 44 (1894) 461
  - Type: Edelfeldt s.n. (Rona Tan)
• Vandopsis muelleri (Kraenzl.) Schltr., Repert. Spec. Nov. Regni Veg. 10 (1911) 196
• Arachnis muelleri (Kraenzl.) J.J.Sm., Bull. Jard. Bot. Buitenzorg, sér. 2, 13 (1914) 47

Roots to several metres long, 1.2 cm diam., smooth, branching where in contact with the soil. Stems erect, branching at the base, to 100 cm long, in upper half many-leaved. Leaves strap-shaped, curved, channelled-conduplicate, to 150 by 8 cm, usually less, very thick leathery, apex acute. Inflorescences from the axils of the lower leaves, paniculate, erect, branches many, lax, to 2 m long, whole inflorescence to 4-5 m long, flowering over a period of several years; peduncle 1-2 m long, 1 cm diam., becoming woody with age, peduncle-scales several, sheathing, rachis zig-zag, laxly many-flowered, with only one or two flowers opening on each branch at the same time. Floral bracts rhombic, very short, 0.5 cm across. Pedicel and ovary narrowly conical, 1.5-1.8 cm long. Flowers resupinated, c. 3.5 cm across, widely opening, very fleshy. Median sepal obovate-subspathulate, 2.2 by 1.1 cm, apical margins erose, apex rounded. Lateral sepals obliquely obovate-subspathulate, 2 by 1.1 cm, apical margins erose, mid-rib outside raised and irregular, apex rounded. Petals ovate-subspathulate, 1.7 by 1 cm, apical margins erose, apex rounded. Lip 3-lobed, 0.7 cm long, when flattened 1 by 1.2 cm, at the base with two tear-shaped keels, apical half abruptly bent upwards through 90 degrees; lateral lobes porrect, oblong to subquadrate; mid-lobe porrect, very thick, cuneate, with an apical ridge extending backwards to a spade-shaped, on the basal side hairy callus on the base of the mid-lobe. Column oblongoid, broad, 0.7 cm long, on either side of the stigma in front with a small arm. Fruit cylindrical to fusiform, 10 by 1 cm.
(After O'Byrne, 1994).

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