106 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 
appearing like halves of a single split glume; lemma lying next to the 
axis, smaller than the glumes, hyaline, keeled, scarcely more than 
1-nerved; palea a little shorter than the lemma, hyaline, 2-nerved. 
Low annuals, with cylindric spikes. Species four, in the Kastern 
Hemisphere, one introduced into the United States. 
Type species: Rottboellia pannonica Host. 
Pholiurus Trin., Fund. Agrost. 131. 1820. Based on a single species, Rott- 
boellia pannonica Host. This species has 2-flowered spikelets. 
Lepiurus Dumort., Obs. Gram. Belge 140, pl. 15, f. 57. 1823. <A single species 
based on “ Rottbolia incurvata L.” fils. 
The species of Pholiurus have been referred by most recent authors 
to Lepturus, the type of which was, by 
the same authors, referred to Monerma. 
Our species, Pholiurus incurvatus (Li). 
Hitche. (Aegilops incurvata L.,1 Lep- 
turus filiformis (Roth.) Trin.) (fig. 54), 
has 1-flowered spikelets. It is intro- 
duced along the borders of salt marshes 
SUAVE A 4 
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is VE 
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SIGS 
Fic. 54.—Pholiurus incurvatus. Plant, X 34; spikelet with a joint of the rachis, X 5; 
spikelet, front view, xX 5. 
from Maryland to Virginia and from Marin County to San Diego, 
Calif. It has no economic value. 
4. AVENEAE, THE OAT TRIBE. 
44, KOELERIA Pers. 
Spikelets 2 to 4 flowered, compressed, the rachilla disarticulating 
above the glumes and between the florets, prolonged beyond the per- 
fect florets as a slender bristle or bearing a reduced or sterile floret at 
the tip; glumes usually about equal in length but unequal in shape, 
the lower narrow and sometimes shorter, 1-nerved, the upper some- 
what broader above the middle, wider than the lower, 3 to 5 nerved; 
1Sp. Pl. ed. 2, 2:1490. 1768. 
