GENERA OF GRASSES OF THE UNITED STATES. 109 
drooping branches, the florets distant in the usually 3-flowered spike- 
lets. Trisetum pennsylvanicum (L.) Roem. and Schult. (Sphenopholis 
palustris (Michx.) 
Scrloms) Ves halle 
Scribn., and 7’. inter- 
ruptum Buckl. have 
been referred to 
Sphenopholis. In 
the first, the upper 
lemma is slightly 
bearded at base, the 
lower glabrous; in 
the other two, the 
Wg lemmas are glabrous. 
WB ° 
‘WZ In these three species 
NW : sate 
ig the articulation is be- 
Wy low the spikelet, as in 
Sphenopholis, for 
which reason Scrib- 
ner placed them in 
that genus, but their 
awned, relatively 
thin lemmas and 
their glumes alike in 
shape place them 
more naturally in 
Trisetum. 
Via. 56.—Trisetum spicatum. Plant, * 243 spikelet and floret, *K 5. 
The species of Trisetum are all valuable for grazing. Z'risetwm 
spicatum constitutes an important part of the forage on alpine slopes. 
