Usually moist sandy soil, in water of ponds and lakes, and seepage along 

 streams, roadsides and other open places in Okla. {Waterfall) and in most of Tex. 

 except w. Plains Country, scattered, Mar-May, rarely to June; e. U.S. w. to Kan., 

 Okla. and Tex. 



3. AgTOStis scabra Willd. 



Similar to A. hyemalis but the glumes 2-2.6 mm. long, some of them on any 

 plant at least 2.2 mm. long; lemma 1.3-1.6 mm. long, rarely as short as 1.2 mm.; 

 palea absent. A. hyemalis var. tenuis (Tuckerm.) GI. 



Moist soil, in flowing water of streams, wet meadows and in mud on edge of 

 ponds and lakes, and openings in forests, at elev. of 6,000-8,300 ft. in the Tex. 

 Trans-Pecos mts. where probably nat., also scattered in other parts of the state 

 (Dallas, Hardin and Harris cos., etc.) where introd., N.M. (Taos and Colfax cos.) 

 and Ariz. (Pima, Coconino, Apache, Navajo, Yavapai, Graham, Santa Cruz and 

 Cochise cos.), July-Sept, in the mts., Apr.-May elsewhere; most of cool temp. N.A. 



4. Agrostis idahoensis Nash. 



Tufted delicate perennial 1-4 dm. tall; ligules 1-2 (-3) mm. long, acute to 

 obtuse, erose-ciliolate and often lacerate; blades mostly lax and flat but some- 

 times folded, 0.5-1.5 mm. wide; panicle narrow but not compressed, usually 

 5-10 cm. long, the capillary branches ascending and forking below the middle and 

 bearing few spikelets; glumes green or purplish, acute, scabridulous on the keel 

 but not on back, usually 1.6-2.4 or sometimes 2.6 mm. long, the first somewhat 

 the longest; lemma about three fourths as long as the glumes, unawned, only 

 slightly bearded (at most) on the callus; palea lacking or not over 0.2 mm. long; 

 anthers about 0.3 mm. long; lodicules 0.2-0.3 mm. long. 



In wet mt. meadows, swamps, shallow water of ponds, lakes, along streams 

 and on sand-gravel bars in river beds, in N. M. (Rio Arriba and Taos cos.) and 

 Ariz. (Apache and Coconino cos.); Mont, to Wash., s. to N.M., Ariz, and Calif.; 

 Alas. 



5. Agrostis perennans (Walt.) Tuckerm. Autumn bentgrass. 



Tufted perennial; culms 25-100 cm. long, 0.5-2.5 mm. thick, leafy, erect or 

 the lowest internodes reclining; ligule a scale 1-3 mm. long; blades 5-22 cm. 

 long, 1-6 mm. broad, flat; panicle 1-3 dm. long, about half as broad, often sub- 

 pyramidal, very diffuse, open, some of the main branches branched near the middle 

 or slightly above, the pedicellary branchlets appressed or often more divaricate; 

 glumes 2-3.2 mm. long; lemma shorter, awnless (in ours, elsewhere rarely awned); 

 palea absent. 



Moist sandy soils along streams and about ponds, in marshes and wet meadows, 

 in Okla. {Waterfall), e. Tex. and N. M. (Otero and Sandoval cos.), infrequent, 

 Oct.; Que. and e. U.S. w. to Neb., Kan., Okla., Tex. and N. M.; also Mex. 



6. Agrostis stolonifera L. Redtop bentgrass. Fig. 108. 



Perennial from rhizomes 2-3 mm. thick; aerial culms 35-100 cm. long, 1.5-2.5 

 mm. thick, the lower internodes usually decumbent, leafy; ligule a thin scale 4-8 

 mm. long; blades 6-20 cm. long, 3-8 mm. broad, flat; panicle 12-25 cm. long, less 

 than half as broad, the branches spreading; glumes equal, 2-3 mm. long, gaping; 

 lemma nearly as long as the glumes, not awned; palea about two thirds as long 

 as the lemma. Often called A . alba L. but that name pertains to a species of Poa. 

 A. gigantea Roth. 



Wet meadows and stream banks, swampy prairies, Typha marshes and ditches, 

 in Okla. (Alfalfa Co.) and e. and n.-cen. Tex., the Plains Country and Trans-Pecos 

 mts., scattered, mostly in tame pastures, in N. M. (Sandoval and Colfax cos.) and 



231 



