ee 'BRIANDRIA. MONOGYNIA. 
gers See es : 
ae tropics; one, the F. umbellata, is also common to India; the 
Ath species, F. canescens, is a native of Africa. 
58. CENCHRUS. (Bur-grass.) 
= Invcolucrum \aciniate, echinate, 3 to 4-flower- 
ed. Calix 2-valved, 2-flowered, 1 fertile the 
other sterile. Style bifid, (sometimes 2.) 
Culm round, in some species branched; flowers in- 
spikes or racemes; proper involucrum caliciform, spiny oT 
hispid, sometimes roundish with a laciniate margin, in 
other species setiform, or more or less deeply divided. 
Sreciss. 1. C. echinatus. 2. tribuloides. 
__ Of this genus there is 1 species in India, but doubtful 
1 ‘as a Cenchrus, 3 in Barbary, besides the C. echinatus equal- 
ae ly indigenous to the United States; the C. capitatus 
- . Barbary, exists also in France and Italy, and the C. hor- 
deiformis is found also in Asia. There is another species in 
Babao, one of the Friendly islands; another in Montevideo 
in South America; 2 others at the Cape of Good Hopes 
and lastly, a shrubby species in the mountains of Ar- 
_ menia. 
- This genus is very nearly allied to Pennisetum. 
“LIMNETIS. Richard. Tracnynoria. Mi- 
chaux. Srarrina. Schreber. (Marsh-grass.) 
Flowers in unilateral spikes almost imbri- 
cated in 2 rows.—Calix 2-valved, carinate, and 
compressed; one of the valves much smaller 
than the other. Corolla 2-valved, awnless. Styles 
long, 1 or 2, Perisporium 0. Seed com- 
pressed. Pa Se 
_ Culm round, rarely hollow, often tall, (the L. polysta- — 
chya trom 3 to 10 feet high); leavesarge and long; spikes 
mm # simple appressed or expanding panicle, long, 
Tany-flowered; valves of the calix very unequal, the larger 
Valve acutely carinate; the carina almost aculeate or — 
is ie €. Seed compressed, Se S 
gd ithstanding the great disparity of habit, this ge- 
lus is véry nearly Fe to the Dactylis, at least to the D. 
ene: oe Dae 2 sometimes 1-flowered. me 
chp thet, suncea- 2. eynosuroides. 5. polystachya. 4. 
glabra. Vhis last species grows up the Missouri‘ as far a 
_ the great Northern Bend, around Fort Mandan. The ge- 
ga 
tee 
