. 24 BOTANY. 
TRISETUM ALPESTRE, Beauv.—This is chiefly distinguished from 7. 
subspicatum by- its slender, open, spreading panicle. It corresponds well 
with European specimens of 7. alpestre—Twin Lakes, Colorado, 1873 
(1174) —Prate XXVIII. Fig. 4. Natural size. 5. Spikelet, magnified 6 
diameters. 6. The same, with glumes removed. . The figure should have 
shown a slight pubescence on the pedicel of the upper floret. 
TrisetumM Wo.ri.—Culms erect from a decumbent base, 14—-2° 
high, smooth above; leaves flat, upper ones short, lower ones 4-6’ 
long, somewhat scabrous, ligule lacerate; flowers in an upright, close, 
almost spicate panicle, which is 2-4’ long, 1-2 rays at each joint; spike- 
lets lanceolate, 2-flowered, and with rudiment or continuation of the 
rachis half as long as the upper flower, the rachis and filament villous; 
glumes lanceolate, membranaceous, acuminate, equalling the flowers, 
which have a few hairs at the base; lower palet lanceolate, acuminate, 
slightly split or 2-toothed at the apex, obscurely 5-nerved, bearing near 
the point a straight appressed awn, equalling or a little exceeding the palet; 
upper palet rather shorter; grain oblong-linear, nearly as long as the palets. 
This obscure grass was collected by Mr. E. Hall in the Rocky Mountains, 
and in his collection was mixed with Poa tenuifolia; it was also collected 
by the writer in 1868, on the expedition of Major Powell, and distributed 
as No. 693 in his collection. Very fine specimens were also collected in 
Middle Park, Colorado, in 1874, by Prof.G. H. French. It is at least very 
close to, if not identical with, Graphephorum melicoides, some specimens of 
which from Mount Kineo, Maine, show the short awn on the lower palet.— 
Twin Lakes, Colorado, 1873—Piatre XXVII. Fig. 1. Natural sizé. 2. 
Spikelet, magnified 5 diameters. 3. A floret, showing the — and the 
linear seed, enlarged 5 diameters. 
Aira caspitosa, L., var. monrana.—The Rocky Mountain forms of 
this species vary from the description in having involute instead of flat 
leaves, but rather thick and coarse, unlike the bristle-form leaves of A. 
flexuosa, and usually also in having longer awns than are described.—Utah, 
1871 and 1872. South Park, — 1873 (1175). Willow Spring, 
Arizona, 1874 (230). 
Hirrocutoa soreauis, R. & S—South Park, Colorado, 1873 (1176). 
