No. 33. 
CHLORIS VERTICILLATA Nuttall. 
Plant annual. 
Culms single or few in a tuft, 10 to 16 inches high, branching at the base, the 
branches commonly sterile, spreading below 
Leaves sometimes obtuse, but usually sonentieles at the apex; sicwth provided 
at the throat, especially near the margin within, with a few long slender hairs. 
Inflorescence short-pedunculate or sometimes sheathed below. Spikes 8 to 14, 
4 to 6 inches long, often naked at the base, clustered at the apex of the stem and 
at that point hairy, or a few verticillate branches in 1 or 2 series on a prolon- 
gation of the axis. Spikelets arranged in 2 rows on one side of the slender, sca- 
brous rachis, at intervals in each row of about 2 to 24 lines. 
Spikelet about 14 lines long, cuneate-obovate, compressed. 
Glumes 4; first and second with 1 scabrous nerve, first as long as the spike- 
let, lanceolate, aristate-acute; second with a longer point, exceeding the spikelet; 
third (flowering) glume 3-nerved, bearing a slender scabrous awn (4 to 5 lines long) 
below the apex, broadly oblong, bluntly acute at each end, short-pilose on the mid- 
rib and intramarginal nerves, elsewhere glabrous; fourth (sterile) glume broadly 
obovate, nearly truncate, 3-nerved, glabrous, with an awn 3 to 4 lines long; small 
fifth glume, similar in form to fourth, usually present. 
Flower sometimes single, hermaphrodite. Palet narrowly oblong, 2-nerved, 
nerves ciliate and margins inflexed. Stames 3; anthers minute. Stigmas cylin- 
drical. Flower often present in the axil of the fourth glume, sometimes her- 
maphrodite, sometimes reduced to an empty palet. 
Grain not seen. 
PLATE XXXII; a, spikelet opened to show the parts, the rachis broken.’ The 
figure represents an unexpanded panicle; when expanded, the branches are spread 
at right angles with the axis. 
