GRASS FAMILY. 71 



Lemma notched at the apex, awned. 1. M. Smithii. 



Lemma neither notched nor aw tied. 

 Lemma attenuate at the apex. 



First empty glume 4 mm. long,', second 5-6 mm. long. 2. M. subulata. 



First empty glume 6 mm. long; second about 8 mm. long. 3. M. Pammelii. 



Lemma obtuse. 



Stem bulbous at the base. 



Panicle narrow; lemma 7-8 mm. long. 



Spikelets usually nodding, flattened; second empty glume shorter than 

 the first flower. 4. M. spectabilis. 



Spikelets erect, terete; second empty glume as long as the first flower. 



5. M. bella. 



Panicle open; lemma 6 mm. long. 6. Af. Macbridei. 



Stem not bulbous at the base. 7. Af. Porteri. 



1. M. Smithii (Porter) Vasey. Perennial with a rootstock; stem 7-12 dm. 

 high, scabrous; leaf-blades 1-2 dm. long, 6-12 mm. wide, scabrous; panicle 1-3 

 dm. long, its branches at last spreading or reflexed; spikelets 3-6-flowered ; first 

 empty glume 4-6 mm. long, obscurely 3-nerved; second glume 6-8 mm. long, 

 5-nerved; lemma about 10 mm. long, strongly nerved; awn 3-5 mm. long. M. 

 retrofracta Suksd. Damp shady places: Mich. Wyo. Ore. Wash. Mont. 

 Jl-Au. 



2. M. subulata (Griseb.) Scribn. Stem with a bulbous base, 5-10 dm. 

 high, smooth; leaf -blades 1-2 dm. long, 5-12 mm. broad, scabrous; panicle nar- 

 row, the erect pedicels swollen just below the spikelets; spikelets 5-6-flowered ; 

 empty glumes acute, scabrous on the keel and ciliate at the apex; lemma about 

 12 mm. long, with scattered hairs below, attenuate. Woods: n Calif. -Mont. 

 Alta. Alaska. Mont. My-Au. 



3. M. Pammelii Scribn. Stem with tuberous base, 5-10 dm. high; leaves 

 flat, 1-3 dm. long; panicle flexuose, with erect branches, scabrous; spikelets 3-6- 

 flowered, lanceolate or oblong; empty glumes obtuse or acutish; lemma 9-10 

 mm. long, 9-nerved, lanceolate, acuminate, broadly scarious-margined; palet 

 densely ciliate, fringed along the nerves. Parks: Wyo. Submont. Jl. 



4. M. spectabilis Scribn. Stem 3-9 dm. high; leaf-blades 1-2 dm. long, 

 2-5 mm. wide, scabrous; panicle narrow; spikelets 10-12 mm. long, 5-7-flowered, 

 usually purple; lower empty glume 5 mm. long, the upper 6-7 mm. long, acutish; 

 lemma 7-8 mm. long, minutely scabrous. M. scabrata Piper & Beattie. Hill- 

 sides and meadows'. B.C. Ore. Colo. -Mont. Submont. Mont. Je-Au. 



5. M. bella Piper. Stem 4-6 dm. high, simple; leaf-blades 1-3 dm. long, 

 3-5 mm. wide, scabrous above; panicle narrow; spikelets 10-15 mm. long, 6-9- 

 flowered; empty glumes obtuse, the first 6 mm. long, the second about 8 mm. 

 Icng; lemma about as long, obtuse. M. bulbosa Geyer. Meadows and hill- 

 sides: Wash. Ore. Utah Colo. Alta. Submont. Mont. My-Au. 



6. M. Macbridei Rowland. Stem slender, 2-5 dm. high, as well as the 

 sheaths hispidulous-scabrous; leaf-blades 1-4 mm. wide, flat; panicle open; rays 

 1-3 at each node, some sessile, others peduncled and reflexed; spikelets 2-5- 

 flowered, 7-13 mm. long; first glume 4 mm. long, 3-nerved; second glume 6 mm. 

 Lng, 5-nerved; lemma 6 mm. long, thick, scabrous, obtusely 2-fid. Dry slopes: 

 Ida. Je. 



7. M. Porteri Scribn. Perennial, with a rootstock; stem 4-7 dm. high, 

 smooth; leaf-blades 1-2 dm. long, 2-5 mm. wide, scabrous; panicle narrow, 12-15 

 cm. long; spikelets 4-5-flowered, nodding, 10-13 mm. long; empty glumes obtuse 

 or acutish, the first about 3 mm., the second 5 mm. long; lemma 3-5 mm. long, 

 scabrous. M. parviflora (Porter) Scribn. Plains and hills: Tex. Kans. 

 Colo. Ariz. Submont. Mont, Je-S. 



61. DACTYLIS L. ORCHARD-GRASS. 



Tall perennials, with creeping rootstocks. Panicles contracted, with the 

 spikelets crowded at the ends of the branches in unilateral head-like clusters, 

 Spikelets 3-5-flowered, the flowers perfect or the uppermost staminate. Empty 

 glumes unequal, 1-3-nerved, mucronate, the second the larger. Lemma more 

 rigid, ciliate on the keel, mucronate or short-awned. Palet nearly as long, 2- 

 keeled. Styles distinct; stigmas plumose. 



