720 GRAMINEZ CH ETOCHLOA 
HOMALOCENCHRUS 
large tumid obovate usually hairy spikelets 144 lines long. Common in 
open places, Washington to California. 
* * * Spikelets crowded in 3-4 rows or irregularly on one side of 
_the spike-like branches of the panicle. | Sod 
P. Crvus-caLtu L. Sp. 56. Stems stout, 1-4 feet high, often branchin 
--at base: sheaths smooth and glabrous: leaves 6-20 inches long, 14-1 ine 
broad, glabrous, smooth or scabrous: panicle composed of 5-15 sessile erect 
or ascending branches, or the lower branches spreading or reflexed : spike- 
lets ovate, green or purple, densely crowded, the glumes more or less 
awned. Common In fields and waste places throughout North America: 
naturalized from Europe. ay | " 
4 CH#TOCHLOA Scribn. U. 8. Dept. Agr. Div. Agrog. Bul. 4, 38. 
Mostly annual grasses with erect stems, flat..Jeaves and spike- 
». like panicles. Spikelets 1-flowered or rarely: with a second sta- 
_;minate one. Rachella with bristles below ‘the articulation. 
‘Spikelets with 4 glumes, the 3 outer membranous, the third often 
subtending a palet and rarely a staminate flower, the fourth 
chartaceous, subtending a palet of similar texture and a perfect 
flower. Stamens 3. Styles distinct, elongated. Stigmas plum- 
ous. Grain free, enclosed in the glume. | 
C. viripis Scribn..1. c. 39. Setaria viridis Beauv. Stems erect or as- 
cending, 1-3 feet high, simple or branched: sheaths glabrous: leaves 3-10 
‘inches long, 2-6 lines wide: spikes 1-4 inches long: spikelets about a line 
long, elliptical, much shorter than the upwardly barbed bristles. In waste 
piacere and cultivated fields, throughout North America; introduced from 
urope. 
Tribe 3 Oryzex Kunth Enum. i, 5. Spikelets usually much 
compressed laterally, 1-flowered, staminate, pistillate or hermaphro- 
dite. Empty glumes 2 or none, the flower being subtended by the 
floral glume and palet alone. Stamens frequently 6. Axis of the 
inflorescence not articulated. 2y 
5 HOMALOCENCHRUS Mieg.; Hall Hist, Stirp. Helv. ii, 201. 
_ Panicle loose, its base often enclosed by the upper sheath. 
. Spikelets much flattened, more or less crowded and overlapping 
each other, awnless, 1-flowered. Glumes only one, hard, strongly 
‘flattened laterally, fringed on the keel with bristly.-hairs, 3-nerved. 
Stamens 1, 3, or 6. Ovary smooth. © Styles short.. Stigmas plu- 
mose with, branching hairs. Grain flat, enclosed hy the glume. 
H. oryzoides Poll. Hist. Pl. Palat. i, 52. Stems 2-3 feet high: leaves 
flat, spreading, 6-8 lines wide, very rough upward: panicle much branched, 
spreading, 6-8 inches long: spikelets 244-3 lines long, pale green: stamens 
3. In wet places, eastern Oregon to California and the Atlantic States. 
Susorper 1 POACEA® R. Br. Verm. Schr. i, 116. 
Spikelets one- to many-flowered, the imperfect or rudimentary 
flowers if any uppermost. Rachella usually articulated above the 
empty glumes so that these are persistent. In spikelets with 2 or 
-... more flowers the rachclla is usually articulated below each flow- 
ering glume. : yoelaagi ) 
iat 
