DISA. 137 
long claw of Trichochila. In D. lugens I have found numerous speci- 
mens with one gland, and also with two; and while both Lindley and 
Reichenbach the younger have observed two glands in D. gramintfolia, 
I have never seen more than one. This instability renders it desirable 
to unite these two groups, which will then form a fairly natural section. 
§ 9. Oregura. This is a section of Lindley’s, based upon a single 
species, to which a second, belonging to the eastern districts, has since 
been added. 
§ 10. Amphigena, includes only a single species, which is sufficiently 
remarkable, by its connection with Herschelia in habit, with Ku-disa 
in its perianth, and with Monadenia in its single gland, to be kept 
distinct. 
The foregoing sections will, I believe, be found to embrace all, or 
nearly all, the known species of this genus. There is, however, 
another section (Aristaria) proposed by Reichenbach the younger for 
a single species, with which I am insufficiently acquainted; but this 
section may hereafter prove to include the species placed by me in 
§ Amphigena.* 
Distrieution. — About 109 admitted species have been described 
(besides a few yet unpublished), of which, in addition to the forty-six 
here enumerated, there are about fifty-one distributed over the coast- 
district between Clanwilliam and Natal; four in Angola, three in 
Eastern Tropical Africa (Kilimanjaro Mt. and the highlands of Man- 
ganja); two in Abyssinia; and three in Madagascar. 
§ 1. Monadenia, Lindley (as a genus), Gen. & Sp. Orch. (1888), p. 
356. — Odd sepal posticous, galeate, erect, spurred at base. Petals 
erect, included or half-exserted. Lip entire, often fleshy. Rostellum 
margined by a membranous or tuberculated process on either side, and 
usually separated by a cleft from the stigma. Pollinia united to a 
single gland.—Spikes few or densely many-flowered, scapes and leaves 
herbaceous, the latter contemporary with the flowers. 
Species 1 to 8. 
§ 2. Eudisa.—Odd sepal posticous, usually galeate, rarely funnel- 
shaped, erect or horizontal, spurred, saccate, or muticous at base. 
Petals included within the odd sepal, erect or reflexed. Lip variously 
shaped. Anther usually reflexed, rarely almost erect. Rostellum 
ample. Glands of the pollinia 2.—Flowers solitary or spicate; leaves 
herbaceous, contemporary with the flowers. 
Species 9 to 20. 
* See note under description of Disa tenuis, page 173. 
