Demlroinu,,,.] CXXVII. OECHIDEA. 1523 



Sect, III. Utonopliyllssdi.— Stems tufted, creepinn or pendiilmis, usually/ terminating 

 in a single leaf leith 1 or 2 or a raceme of several (lowers at its base. 



Bhizome creeping. Stems short, thick, erect, corrugated. Leaves usually 

 solitary, oblon};, about 4in. long. Flowers yellow in racemes as 

 long as the leaves 23. Z). moiiophjUum. 



Bhizome creeping. Stems short conical ^in. high. Leaves 2 often 

 twisted, linear-oblong, ema'ginate, lin. long, Raceme pendulous, 

 3Jin. long. Flowers greenish-yellow 24. Z). Schneiders;. 



Stems slender tufted, ersct, about 4in. high. Leaves solitary about 2in. 

 long, emarginate. Flowers white. Ovary hispid, glabrous in the 

 variety 25. D. Mspidum. 



Sect. IV. Rhizobium. —i?/i/^omes or stems creeping or elongating and pendnlous, with 

 scarious sheathiiig scalea. Leaves solitary in the axils of the scales, either sessile on a broad 

 disk or on a very short turbinate protuberance. Racemes usually few-flowered. 



Bhizome creeping, stems rigid elongate. Leaves oblong, fleshy, 

 tuberculate resembling minute cucumbers. Flowers streaked with 

 red. Labellum middle-lobe ovate-acuminate 26. D, cucumerinum. 



Leaves flat, coriaceous very acute. Sepals lanceolate, about 5 lines 



long without the spur 27. D. pugioniforme. 



Leaves very thick and fleshy not sulcate. Sepals oblong, about 

 3 lines long, lateral ones deltoid. Labellum thick, the middle 

 lobe oblong . . . 28. 2), rigidum. 



Leaves thick oblong, 1 to 2iri. long, often 2 sulcate and wrinkled. 

 Flowers in racemes of 3 to 4in. Segments narrow linear- 

 lancecliite 29. D. linguiforme. 



Shct. V. Strong'yle. — Stems branched, usually slender. Leares distant, terete, sometimes 

 more or less sulcate. liacenies of few flowers or sometimes solitary. 



Flowers in racenrs. Sepals and petals narrow, lin. or more long. 

 Spur 2 or 3 lines long. Labellum middle-lobe recurred, long 

 acuminate, the lower half undulale 30. D. teretifoUnm. 



Stems erect, then branching anrl very plender and drooping. Leaves 

 2-formed, lower ones twite as large as the upper. Flowers 

 solitary . 31. 7). Beclileri. 



Stems slender, branching. Leaves slender, somewhat bluntly 4- 

 angled. Flowers in pairs on a short peduncle. Sepals 5, petals 

 3-ribbed 32. Z). Mortii. 



Stems slender branching sligh'ly drooping. Leaves slightly sulcate. 



Labellum middle-lobe broadly reniforme 33. D, liowmanii. 



Sect. ? 



Ilbizome creeping, stems terete, finger-like, 2 to 4in. long. 

 Leaves terminal, 1 or 2, lanceolate. Sin. long, lin. broad, 

 liacenies 2 to Sin. long, hoary, bearing nearly sessile purplish 

 flowers . . f ... ... . 34. D. eritcoidcs, 



1. B. bigibbum (referring to the double spur or cbin), TAiuU. in Fa.rt. Fl. 

 Gard. iii. 2.5, /'. 245 ; Benth. Fl. Austr. vi. 277. " Zula," Batavia 

 River, Roth. Stems to 18in. long, slightly contracted towards the base, 

 bearing in the upper part 3 or 4 lanceolate leaves of 3 or 4in., and in the older 

 plants swollen at the base in a short pseudo-bulb. Raceme apparently terminal 

 on a peduncle of 6 to 8in., with 3 to 10 flowers of a deep lilac on pedicels 

 of f to lin. Sepals ovate or ovate-lanceolate, acute, 9 to 10 lines long and about 

 5 lines broad in most specimens, the lateral ones produced with the basal 

 projection of the column into an obtuse pouch with a conical straight or curved 

 abtuse spur on the lower side forming a double spur. Petals broadly obovate 

 almost orbicular, fully fin. broad. Labellum rather shorter than the sepals, with 

 the large lateral lobes forming a very broad base, the middle lobe at least as 

 broad as long, very obtuse or retuse and not so long as the broad base, the disk 

 with 3 to 5 raised longitudinal lines fringed or crested from the middle upwards. 

 -— Bot. Mag. t. 4898 ; Fitzg. Orch. ii. pt. 5. 



Hab.: Mount Adolphns, Torres Straits, Thomson ; one or other variety is met with northward 

 from Cooktown. 



