No. 32. 
CHLORIS GLAUCA Vasey. 
Plant annual, entirely glabrous. 
Culm single, erect, 2 to 4 feet high, glabrous, unbranched. 
Leaves of the root numerous; sheath very closely compressed, equitant, widely 
diverging, about 3 lines wide when folded, 8 inches or less long, continuing into 
the blade with a mere slight contraction at the mouth; blade folded below, flat 
above, keeled, 3 to 4 lines wide,4to 12 inches long, abruptly obtuse at the apex; second, 
third, and usually fourth internodes of the culm very short, their leaves similar to 
those of the root and appearing to start from the first node of the stem. Suc- 
ceeding leaves 1 or 2, with longer close sheaths; blade nearly wanting. 
Inflorescence an erect, pedunculate, umbellate cluster of 8to 15 spikes. Spikes 
3 to 5 inches long; rachistriangular, scabrous; this and the first and second glumes 
greenish straw-color, remainder of the spikelets very dark brown or black 
Spikelets in 2 rows on one side of the rachis, inserted alternately, those in 
each row at intervals of about $ line, 1 line long. 
Glumes 4; first 2 line long, ovate-lanceolate, acute, inzequilateral, with 1 
rigid scabrous nerve; second 1 line long, linear, notched at the apex, nerved 
like the first, nerve produced into a short deflexed scabrous mucro, mucros sec- 
und along the edge of the spike; third (flowering) glume compressed, scabrous 
toward the apex, each half oblong, acute; fourth (sterile) glume obovate, truncate, 
scabrous along the upper margin, rolled into a tube. 
Flower single, hermaphrodite. Palet oblanceolate-oblong, notched at the 
acute apex, 2-nerved, with additional inflexed margins. Stamens 3; 
anthers oblong-linear, } line long, notched at the apex. Stigmas short cylindr ey 
Grain oblong, acute at either end, triangular in cross-section ; rachilla disar- 
ticulating above the second glume. 
Plate XXXII; a and b, spikelet opened to show the parts; rachilla broken at 
the point of disattioulation. The leaf belonging to the uppermost node of the 
stem is not shown. 
Notre.—This species was inserted here, by mistake, instead ofgChloris Swart- 
ziana Doell. (Chloris petrea Swz.), which occurs in Texas near the coast. It is 
much less robust, with narrower leaves, fewer spikes (3 to 5), and some difference 
in the flowers. It is possible, however, that both species may occur, although 
Chloris glauca is principally known from Florida, 
