POACEAE 87 
Eu ca spines relatively few, usually 2-4 mm. 
3. C. incertus. 
Buse gl labrous: spines numerous, 4-6 mm. long. 4. C. gracillimus. 
Burs udi E aet Et mu ue spines AET stems 
ng: plants a . 
Burs 7-8 mm. wide, finely pubescent. 5. C. pauciflorus. 
Burs 10-15 m m. wide, densely woolly : E des usu- . . 
ally included at base in the inflated sheaths. 6. C. tribuloides. 
II. MYOSUROIDES E 
A stout glaucous woody perennial. 7. C. myosuroides. 
1. C. Meas Spreng. Stem erect or spreading, 30-50 cm. tall: leaf-blades 
lax, 6-12 mm. wide: spike about 10 em. long—Hammocks, fields, and waste- 
places, S Fla — (W. I., Mez., C. A., 
echinatus L. Stem UM em. pur d 
blade flat and thin, 5-10 mm. wide: spik 
ually 5-7 em. long.— (Hepes HOG- ies) 
Spinola nds, hammocks, coastal sand-dunes, 
fields, and waste- n- Coastal Plain and V 
adj. Mr Fla. to N. Mex. and 8. C.— IAN, 
(W. I., Mez., C. A., 8. A.) ff NN 
ncertus M. A. Curtis. Leaf. blades SA 
em 
at base. —Sandy soil, pinelands, woods, and 
dunes, Coastal Plain, Fla. to Tex. and 
N. C. 
4. C. Pd Nash. In dense A ee is leaf- ws Rari stiffly ae 
usually 2-3 mm. wide: spike often long-exserted, . long: burs usually 
few, the ae slender —BSandy soil, pinelands n poete dunes, Fla. and 
Ala.—(W. I.) 
5. C. dro Bent th. Ste m 20- 60 em. long: nee n am mm. wide: 
spike 3-8 ¢ : burs usually 6-12, sometimes more, the spines 3-4 mm. 
long. [C. t vibuloides (Fl. SE. U. S. Yes —Sandy soil, "rondsides ee grounds, 
Lr i us stal ds various provinces, Fla. to Calif. and Me.—(W. I., 
, €. A., 8S. A.) 
: bd pog ocu = MET C. paucifiorus: plant more robust, the trailing 
much as long. [C. macrocephalus Seribn.]—Sandy cu 
qe Plain, Fla. » La. and Long Id. N. Y.—(W. I., Mex., C. A., S. A.) 
7. C. myosuroides H. B. K. Stem ind ae ien at base, branching, 
1-1.5 m. E B 5-20 em. long: bur ow, numerous, contiguous: spike- 
lets about 5 mm. long.  [Cenchropsis "myosuroides Nash | andy soil, ea 
grounds, ne tenchas Coastal Plain, Fla. to La. and Tex—(W. I., "Mex 
C. Á., s. A.) 
C. san cei a a spre inne annual with stems up to 1 long, its 
ur , 2. flowered, the lobes sd at the base only, the flat erect 
inner- dobes deus ciliate, has been collected on ballast at Mobile, Ala 
36. STENOTAPHRUM Trin. Creeping stoloniferous perennials, with 
short flowering stems, rather b and short obtuse leaf-blades, and terminal 
and axillary racemes. Spikelets imbedded in one side of an enlarged and 
flattened articulate rachis: first glume small: second glume and iue lemma 
