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37. Elymus L.. Wi-Ryez. 
Spikelets 1- -flowered, all %; florets dis- 
tichous, the uppermost rudimentary. Glumes 
2, equal, anterior. Palets 2, low or concave. 
Ovary hirsute.—2¢. Leaves flattened. Spike- 
lets representing a single spike. 
1. E. arenarius L. Glumes acuminate, 
shorter than the spikelet; lower palet carinate 
towards the cuspidate tip; leaves pungent.— 
Cliff House. Summer. 
Introduced under the name “Esparto Grass,” 
to keep the sand dunes from moving. 
2. HE. conpEnsatus Presl. Glumes subu- 
late-setaceous, shorter than the spikelet; lower 
palet 5-nerved, mucronate, sometimes shortly 
aristate; leaves ample, flat.—San Francisco. 
Summer. 
3. E. Siptrtcus L. Glumes linear, 3—-5- 
nerved, acute or shortly aristate; lower palet 
aristate, the awn longer than the palet.—San 
Francisco. Summer. 
4. . Srranton Schult. Glumes very long, 
sometimes 2-parted, ending in several very long 
awns.—San Rafael. Summer. 
38. Gymnostichum Schreb. Borrte-srusn Grass. 
Spikelets 1-4-flowered; florets remote, the 
uppermost rudimentary. Glumesrudimentary, 
often wanting. Palets 2, lower aristate, em- 
