18 III. ORCHiDE^. [Disa 



2. D. aurantiaca Eclib. f. in Flora 1867, p. 98 ; Durand & Schinz, 

 Ic, p. 100. 



HuiLLA. — A herb with two large sublobed tubers, stem erect, 1 to 

 li ft. high, firm, green, clothed with long-acuminate scale-like greenish 

 leaves. Ovary pale yellow-green, corolla a splendid orange colour. 

 Here and there in lofty damp places near Quipaca, Morro de Lopollo. 

 Middle of Xov. 1859. Xo. 713. 



Apparently very near the last species, but represented only by a 

 sketch and part of a flower, from which it is impossible to arrive at 

 a definite conclusion. 



3. D. equestris Rclib. f. in Flora 1865, p. 181 ; Durand & Schinz, 

 Ic, p. 102. 



HuiLLA. — A bitubercled herb, 1 to H ft. high, with the habit of 

 Orchis 2)(dustr/i<, stem solid ; leaves radical springing from the secondary 

 tuber soon after flowering, linear-lanceolate, plicate, half-a-foot long ; 

 bracts short obtuse, green-purple; stem spotted with green and purple 

 near the tip ; outer perianth-segments violet-purple, the lateral spread- 

 ing, the posterior concave, hooded, passing into a long obtusely conical 

 spur, and enveloping the two inner segments and the column ; two 

 inner segments erect, subspathulate, white, counivent, marked at the 

 apex with an oblong purple spot ; labellum together with the two 

 •outer segments deflexed, simple, narrowly obovate, white at the base, 

 reddish-purple at the flnely apiculate tip. In boggy marshy ground 

 near streams with Eriocaulon, etc., on the heights (4000 to 4500 ft.) 

 of Huilla ; in fl. Nov. 1859. In damp meadow-land growing with 

 species of Sphagnum, Sclerki, and Utricularia, at an elevation of 

 5000 to 5400 ft., Morro de Lopollo, already past flowering, Feb. 18G0. 

 No. 717. 



4. D. Welwitschii Echb. f., I.e. ; Durand & Schinz, I.e., p. 110. 

 Huilla. — Aherb 1 toHf t. high, with two oblong tubers, leaves radical 



borne only on the young lateral tubers, short and almost sheath-like on 

 the flowering stem, acuminate, somewhat stiff, glaucous, and passing 

 gradually into the yellowish bracts. Spike dense, pyramidal, comose, 

 finally oblong, a very bright scarlet, very beautiful. Two lateral 

 sepals erecto-patent, hood spurred, erect, half embracing the two 

 inner segments, which are semicircular with an erect orange-coloured 

 spathulate appendage on the inner side. Lip descending, narrow-linear, 

 shortly acuminate. Perianth a bright rose-scarlet except for the 

 orange-coloured appendage of the inner segments. Plentiful in lofty 

 boggy places 5000 to 5300 ft. at Morro de Lopollo. Jan. and Feb. 

 1860. No. 715. 



5. D. versicolor Rchb. f., I.e. ; Durand & Schinz, I.e., p. 110. 

 Huilla. — A herb 1 to 2 ft., with two tubers, adult tuber 2- to 3- 



digitate, comparatively large, with a goaty smell. Leaves radical, 1 ft. 

 long, lanceolate, obtusely carinate, borne only on the lateral tubers. 

 Stem firm, solid, spotted with purple at the base like the leaf-sheaths ; 

 upper cauline leaves and bracts streaked with pniple at the tip or 

 throughout, point deep purple. Sepals whitish marked with crimson, 

 the concave hood passing into a cylindrical purple spur, the lateral 

 ones semi-ovate, spreading ; petals subtriangulai-, greenish-orange 

 margined with purple, looking forward, bright piirjile at the base ; lip 

 simple, narrowly spathulate-ligulate, with a .subtruncate apex, descend- 

 ing, as long as the anterior sepals. As only the ihree rose-coloured 

 sepals are seen in the bud, the orange-yellow petaK appearing with the 



