DISA. 139 
with two short arms, as in Fu-disa; caudicles of the pollinia ter- 
minating in two distinct, contiguous or attached and separable glands, 
or in a single gland.—F lowers mostly blue or purple, in loose racemes ; 
scapes slender, rigid; leaves radical, linear, wiry, contemporary with 
the flowers. Species 40 to 44. 
§9. Oregura, Lindley, Gen. & Sp. Orch. (1838), p. 852. — Odd 
sepal posticous, galeate, horizontal or incumbent, with a long straight 
spur. Petals included within the odd sepal. Rostellum broad and low. 
Glands of the pollinia 2.—Flowers in loose spikes; scapes slender, 
rigid; leaves radical, linear, grass-like, appearing before the flowers, 
and withered during flowering. Species 45. 
§10. Amphigena. —Odd sepal posticous, galeate, ascending. 
Petals erect, included. Rostellum destitute of appendage. Caudicles 
of the pollinia, terminating in a single large gland.—Flowers small, 
spiked ; scape slender, wiry ; leaves radical, linear, grass-like, springing 
from a basal sheath, appearing before the flowers, and withered during 
flowering. Species 46. 
KEY TO THE SECTIONS OF DISA. 
Odd sepal anticous. 
Odd sepal mostly hooded, rarely sub- siege not ae .. OrtHocarpPa 6. 
Odd sepal flat, spurred are Ag xc -.  VAGINARIA 7. 
Odd sepal posticous. 
Caudicles of the pollinia terminating in a single gland. 
Leaves synanthous, free, radical, linear ac HERSCHELIA 8. 
Leaves a aac enclosed at base in a single cane 
wiry .. .. AmpuHicEena 10. 
Leaves A tinnehote fee, dina and auline herbaceous, 
expanded er se 5c .. Monapenra l. 
Caudicles of the pollinia terminating in Wo ansianel glans 
Odd sepal concave and umbonate, or nearly flat .. .. WEXILLATA 3. 
Odd sepal galeate, hooded, fornicate, or funnel-shaped. 
Leaves hysteranthous (linear, grass-like).. i -- OREGURA 9. 
Leaves synanthous. 
Petals more or less exserted. 
Spur acute, stem straight .. 5c Se .. CorypHana 4. 
Spur obtuse, stem flexuose at the nodes .. .. ScHizopium 5. 
Petals included within the odd sepal. 
Leaves wiry, lip more or less incised at .» HERSCHELIA 8. 
Leaves not wiry, lip entire .. Se Sc .. Hvupisa 2. 
