18 III, ORCHIDE. [Disa 
2. D. aurantiaca Rchb. f. in Flora 1867, p. 98; Durand & Schinz, 
ic. p. 100. 
Houitita.—A herb with two large sublobed tubers, stem erect, 1 to 
1} 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 Nov. 1859. No. 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 Rchb. f. in Flora 1865, p. 181 ; Durand & Schinz, 
Zc., p. 102. 
Hvma.—A_ bitubercled herb, 1 to 13 ft. high, with the habit of 
Orchis palustris, 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, connivent, 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 finely 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, Scleria, and Utricularia, at an elevation of 
ae 5400 ft., Morro de Lopollo, already past flowering, Feb. 1860. 
o. 717. 
4, D. Welwitschii Rehb. f., 2.c.; Durand & Schinz, dc., p. 110. 
Huiiia.—A herb 1 to1}ft. 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 Rehb. f., Zc. ; Durand & Schinz, lc. p. 110. 
_Huitia.—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 purple 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 subtriangular, greenish-orange 
margined with purple, looking forward, bright purple at the base ; lip 
simple, narrowly spathulate-ligulate, with a subtruncate apex, descend- 
ing, as long as the anterior sepals. As only the three rose-coloured 
sepals are seen in the bud, the orange-yellow petals appearing with the 
