214 A TEXT-BOOK OF GRASSES 
EE. Rachis not prolonged. . . ELEUSINE. 
BB. Spikelets with only 1 perfect floret, often 
with additional imperfect or modified 
florets above, sometimes also below. 
c. Spikelets without additional modified 
florets, the rachilla sometimes prolonged. 
p. Rachilla articulated below the fit 
E. Glumes narrow, unequal. . . SPARTINA. 
EE. Glumes equal, broad and _ boat- 
RR eh es hice el a oe te, BECKMANNIA. 
DD. Rachilla articulated above the glumes. 
E. Spikes digitate; plants extensively 
CEEERENEM Sisas oa Cckte we fa eee CAPRIOLA 
; (Par. 242). 
EE. Spikes racemose; plants cespitose.. . .SCHEDONNARDUS 
cc. Spikelets with 1 or more modified florets 
above the perfect one. 
D. Spikelets with 2 sterile florets below the 
RCC aise Sc. hoe as sk atte CAMPULOSUS. 
DD. Spikelets with no sterile florets below 
the perfect one. 
E. Spikes digitate. 
F. Fertile lemma 1-awned or awnless..CHLORIS 
(Par. 243). 
FF. Fertile lemma 3-awned........... TRICHLORIS. 
EE. Spikes racemose. 
F. Spikelets distant; spikes slender....GyMNOPOGON. 
FF. Spikelets approximate, often im- 
bricated. 
G. Spikes usually short and es 
stout, sometimes with only 1 
to few Le ec en BoUTELOUA 
(Par. 244). 
242. Capriola Adans—A small genus of Old World 
grasses, one of which, Bermuda-grass (C. Dactylon), has 
been introduced in America and is now common in the 
tropics and warmer regions as far north as Maryland and 
southern Kansas. This is a low perennial, producing 
extensively creeping stolons and rhizomes and erect flower- 
culms, a few inches to a foot or more in height, ending in 
3 to 6 slender digitate spikes. It is an excellent grass for 
lawns and pastures in the southern states but in cultivated 
fields often becomes a troublesome weed. In soft soil it 
