537 
floral glumes herbaceous or coriaceous, obtuse or dentate, mucronate, 
convex, enveloping the palet and stamens: grain translucent, broadly 
spindle-shaped.—A low tufted grass, with flat rather thick leaves 
fasciculately crowded at the nodes. 
1. M. squarrosa (Nutt.) Torr, Culms 1 to 2dm. high, spreading, fasciculately 
branched: leaves 2 to 3 em. long, rigid and pungent (Crypsis squarrosa Nutt.)—Dry 
plains, Texas to Montana. 
56. ARUNDO L. 
Spikelets 3 to 4-flowered, cuneate, in a large dense plume-like 
panicle: empty glumes lanceolate, attenuate, subequal, smooth, about 
equaling the florets; floral glumes convex, cleft at the attenuate apex 
and short-awned from the sinus, bearing near the base abundant 
silky hairs nearly as long as the glume; palet ciliate on the keels, 
nearly one-half as long as its glume; internode of rachilla glabrous,— 
Tall broad-leaved grasses from perennial rootstocks. 
1, A. Donax L. Culms 2 to 5 in. tall: leaves clasping at the broad base: spike- 
lets about 1 cm, long.—Cultivated for ornament and sparingly naturalized in low- 
land. 
57. PHRAGMITES Trin. 
Spikelets 3 to 7-flowered, cuneate, in large plume-like panicles; 
empty glumes lanceolate, the second one-third longer than the first and 
about equaling the florets; floral glumes lanceolate, attenuate, entire, 
glabrous, much longer than the palets; internode of rachilla pilose with 
silky hairs as long as the florets.—Tall stout broad-leaved grasses 
from long perennial rootstocks. 
1. P. Phragmites (L.) Karst. (Reep Grass.) Culms 2 to3 dm. high: leaves nar- 
rowed at the base: spikelets nearly 1 em, long (Arundo Phragmites L. Phragmites 
conmunis Trin.)—Wet land throughout the United States. (Often improperly 
ealled Pampas grass. ) 
58. SIEGLINGIA Bernh. 
Spikelets 2 to 10-flowered, compressed or subterete, perfect except 
the upper florets or rarely diqecious: panicle capitate, spike-like, open 
and spreading or linear and slender: empty glumes membranaceous, 
subequal, broadly ovate, usually nearly equaling the lower florets, 1 
(rarely 3)-nerved; floral glume oblong or nearly rotund, entire, emar- 
ginate or cleft at the apex, membranaceous (rarely coriaceous in the 
middle), 3-nerved, the lateral nerves nearly marginal, all usually 
pubescent near the base, the middle one and sometimes the lateral 
ones slightly excurrent; palet broad, prominently keeled.—Perennial 
grasses of variable habit. (Triodia R. Br.) 
* Spikelets compressed, in short verticillate leafy panicles. 
1. S. pulchella (Kth.) Kuntze. Culms 1 din, high, fasciculately branched from a 
stoloniferous base: leaves fasciculate, involute, setaceous, | to 3 em. long: spikelets 
white, 5 to 8 mm, long, 5 to 10-flowered; floral glumes 4 to 6 mm. long, prominently 
