52 Graminaceae 
a terminal sterile or male flower. Glumes keeled, thinly scarious on the sides, unequal; 
the first the shorter, |—-5-veined; the second nearly as long as the spikelet, 3-veined. 
Lemma more hyaline than the glumes, keeled, acute or shortly bifid, awned; awn attached 
above the middle, dorsal or at the base of the cleft (sometimes none in 7. muticum), 
usually twisted at base and more or less bent. Palet hyaline, narrow, usually 2-toothed. 
Stamens 3. Grain smooth, oblong, unfurrowed, glabrous or pubescent at the apex, en- 
closed, free. (L. tres=3, seta—a bristle; lemma has | awn and 2 sharp teeth.) 

A. _Glumes almost equal; lemma acute, awnless or with awn about | mm. long or less. 
B. Glumes Voor 7 mm. long; spikelets 3-flowered. E. 
T. muticum Scribn. (Beardless False-oat) 
BB. em 3— 5mm. long; spikelets 2-flowered. E. (Grapheophorum wolfi.) 
T, wolfii Vas. (Wolf’s False-oat) 
AA. Glumes unequal, the first 2/3—34 as long as the second; lemma cleft at apex, 
awn 4—12 mm. long. 
C. Panicle dense, 5—12 cm. long; plant 1.5—-6 dm. high; spikelets 5—6 mm. 
long. W.C. E. (T. subspicatum; T. spicatum molle; T. subspicatum molle.) 
T. spicatum Richt. (Narrow False-oat) 
CC. Panicle not dense, |12—-20 cm. long; plants 3—-I12 dm. high; spikelets 6—8 
mm. long. 
D. Leaf-sheath glabrous; lemma 5—6 mm. long, awn arising below the cleft. 
W.C. E. T. cernuum Trin. (Nodding False-oat) 
DD.  Leaf-sheath pubescent; lemma 6—7 mm. long, awn arising at the cleft. 
W.C. E. T. canescens Trin. (Silvery False-oat) 
DANTHONIA (Merathrepta) OAT-GRASS 
Perennial, or rarely annual. Spikelets several-flowered, pedicelled or almost sessile, 
solitary or’ in a raceme or panicle; rachilla jointed above the glumes, hairy, extending 
above the flowers. Glumes narrow, keeled, acute,*awnless, persistent, 3—7-veined, rarely 
l-veined, usually as long as the spikelet. Lemma rounded on the back, 7—9-veined, 
awned, with 2 terminal lobes; lobes firm, scarious, more or less 1——3-veined at base; 
awn twisted, bent, arising between the lobes. Palet wide, as long as the entire part of the 
lemma or longer, obtuse or 2-pointed. Stamens 3. Grain glabrous, free. (Honor of 
Etienne Danthoine, a French botanist.) 
A. Spikelets in a narrow close panicle, ascending. 
B. . Callus elongate, densely hairy. 
C. Leaves of sterile shoots 15—-25 cm. long, sparsely hairy. C. E. 
D. intermedia Vas. 
CC. Leaves of sterile shoots longer, without hairs. W. E. 
D. intermedia cusickii W™s. 
BB. Callus very short, with a few short hairs. W. E. 
D. pinetorum (Pip.) 
AA. Spikelets solitary or spreading in a loose panicle. 
D. Spikelets 3—10; leaf-sheath only slightly hairy; apex of lemma with 2 teeth 
2—3 mm. long. E. D. californica Bol. (California Oat-grass) 
DD. Spikelets 1—4; leaf-sheath quite hairy; apex of lemma with 2 awl-like teeth 
3-—10 mm. long. 
E. Spikelets usually 2—4; lemma abruptly narrowed, 6—8 mm. long. W. C. 
D. americana Scribn. 
EE. Spikelets usually only 1; lemma not abruptly narrowed, 8—10 mm. long. 
E. D. unispicata Thurb. (Mountain. Oat-grass) 
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