362 The Botanical Gazette. [June, 
2. Spikes one or two; awn of the fourth glume nearly two 
inches, recurved. 
CTENIUM CIRRHOSUM Kth. Rev. Gram. 445. pl. 136. 
Campulosus cirrhosus Nees Agrost. Bras. 416. 
Culms slender, cespitose, two to four feet high; leaves 
scabrous; spike one; first empty glume nearly as long as the 
spikelet; second empty glume much exceeding it; third glume 
with an awn twice as long as itself; fourth glume with a re- 
curved awn nearly two inches long; fifth glume cuspidate or 
mucronate at the apex. 
On high plains in southern Brazil. 
3. Spikes one or two; awn of the fourth glume one-half inch 
long or less. 
a. Nerves of the second glume scabrous, not glandular- 
tuberculate. 
CTENIUM CHAPADENSE Doell. in Mart. Flor. Bras. 2°: 73- 
Campulosus Chapadensis Trin. Sp. Gram. A/. 703. ; 
Culms slender, three feet high, basal leaves six to nine 
inches, those of the culm about four inches long, the uppet- 
most shorter; spike one, terminal; first glume a little shorter 
than the spikelet; second glume twice exceeding it; third and 
fourth glumes ciliate, pilose at the base, with awns four or five 
times longer than themselves; fifth glume ciliate, naked at the 
base, longer than the third and fourth glume, with an awn 4 
little longer than itself, 
Florida to Argentina. 
b. Nerves of the second glume strongly glandular-tuberculate. 
Culmi 14-18 pollices longi, simplices, erecti, teretes, abe 
ati, scabri praesertim sub nodis, apice distincte striati pubes 
pollices longa, recta aut falcata subspiralis, rachis plana s¢® 
