22 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Panicles narrow and few-flowered; culms 
erect and wiry; blades drying in- 
VOUIULC ee sn he mete Liste Saal Fo See 
Panicles open or contracted, many- 
flowered. 
Panicles 40 to 60 cm. long, the numer- 
ous elongated branches in verticils; 
tropicalespecieste ass eae ee 81. 
Panicles mostly much less than 40 cm. 
long; branches not verticillate. 
Spikelets short-pediceled along the 
nearly simple panicle branches.See 
Spikelets long -pediceled; panicle 
open (dense in P. hirsutum). 
Spikelets viscid; first glume about 
as long as the second; tropical 
SPeCled tte eaten ies 7d) 
Spikelets not viscid; first glume 
much shorter than the second. 
Culms erect or rarely spreading; 
blades linear, usually elon- 
gated; spikelets pointed. -.See’ 
Culms decumbent at base; 
blades ovate to oblong-lan- 
ceolate; spikelets blunt; 
tropical species. 
Panicles mostly less than 5 
cm. long; plantsglaucous. 77. 
Panicles 10 to 20 cm. long; 
plants not glaucous...... 78. 
TENERA, p. 97. 
P. megiston. 
AGROSTOIDIA— 
p. 99. 
P. glutinosum. 
Dirrusa, p. 71. _ 
P. parvifolium. 
P. millegrana, 
Subgenus PAUROCHAETIUM subgen. nov. 
ne yet 
Perennials; culms tufted, erect, blades not over 7 mm. wide; inflorescence narrow, 
more or less interrupted, the branches short and appressed, the ultimate branchlets 
bearing | to several spikelets, produced beyond the uppermost spikelet as a bristle 1 to 
6 mm. long; spikelets 1.5 to 3.5 mm. long, much swollen on the face, glabrous; fruit 
transversely rugose, apiculate. 
TRacth, The type species is P. distantiflorum Maetrx: 
This group approaches Chaetochloa in having branchlets produced into bristles, and 
in the shape of the spikelets and rugose fruits. 
Blades elongated, usually more than 15 cm. long, narrowed 
toward the base. 
Spikelets about/3.5 mm long. S32 2-22 se eee eee Ee eee 5. P. reverchoni. 
Spikelets about 2 mm. long, or less. 
First glume rounded or truncate; second glume about 
2s long as inuiticece osc ee eee eee 3. P.chapmani. ~ 
