GRASS FAMILY 



00 



12. Agrostis breviculmis Hitchc. 

 Dwarf Bent-grass. Fig. 339. 



Trichodium nanum Presl, Rel. Haenk. 1: 243. 1S30. 



Agrostis nana Kunth, Rev. Gram. 1: Suppl. XVIII. 1830, not 



Delarbre. 1800. 

 Agrostis brei-iculmis Hitchc. U. S. Dept. Agr. Bur. PI. Ind. Bull. 



68: 36. {<>■ IS. 1905. 



Culms cespitose, erect, 10-15 cm. tall; panicle strict 

 and narrow. 2-3 cm. long ; glumes 3 mm. long, acute ; 

 lemma a little more than half as long as glumes, awn- 

 less or bearing a very short awn near the middle of 

 the back ; palea a minute nerveless scale. 



Open ground and clay cliffs, Fort Bragg, California; also in 

 Peru, the type locality. 



13. Agrostis rossae A'asey. 

 Ross's JJent-grass. Fig. 340. 



Xat. 



Agrostis larians Trin. Mem. Acad. St. Petersb. VI. Sci 



4': 314. 1841, not Thuill. 1790. 

 Agrostis rossae Vasey, Contr. U. S. Nat. Herb. 3: 76. 1892. 

 Agrostis variabilis Rydb. Mem. N. Y. Bot. Card. 1: 32. 1900. 



Culms 10-20 cm. tall; panicle contracted, 2-6 cm. 

 long, the branches appressed ; spikelets green or purple, 

 2 mm. long; lemma 1.5 mm. long, awnless; palea 

 minute. Differs from A. exarata chiefly in the size, 

 possibly an alpine form of that species; glumes not 

 scabrous on the back as usual in A. exarata. 



Rocky creeks and mountain slopes of the Alpine Zone; Wash- 

 ington to Sequoia National Park and east to Wyoming. Aug.- 

 L, Sept. Type locality: Yellowstone Park. 



14. Agrostis exarata Trin. 

 \\'estern Bent-grass. Fig. 341. 



Agrostis exarata Trin. Gram. Unifl. 207. 1824. 



Vilfa glomerata Presl, Rel. Haenk. 1: 239. 1830. 



Agrostis glomerata Kunth, Rev. Gram. 1: Suppl. XVII. 1830. 



Agrostis grandis Trin. Mem. Acad. St. Petersb. VI. Sci. Xat. 



4': 316. 1841. 

 Agrostis asperifolia Trin. Mem. Acad. St. Petersb. VI. Sci. Xat. 



4': 317. 1841. 

 Agrostis scoitleri Trin. Mem. Acad. St. Petersb. VI. Sci. Nat. 



4': 329. 1841. 

 Agrostis calif ornica Trin. Mem. Acad. St. Petersb. VI. Sci. Nat. 



4': 359. 1841. 

 Agrostis microphylla Steud. Syn. PI. Glum. 1: 164. 1854. 

 Polvpogon alopecuroides Buckl. Proc. Acad. Phila. 1862: 88. 



1863. 

 Agrostis albicans Buckl. Proc. Acad. Phila. 1862: 91. 1863. 

 Agrostis densiflora Vasey, Contr. U. S. Nat. Herb. 3 : 72. 1892. 

 Agrostis densiflora arenaria Vasey, Contr. U. S. Xat. Herb. 3: 



58, 72. 1892. 

 Agrostis microphylla major Vasey, Contr. U. S. Nat. Herb. 3: 



58, 72. 1892. ' 

 Agrostis inflata Scribn.; Canad. Record. Sci. 6: 152. 1894. 

 Agrostis ampla Hitchc. U. S. Dept. Agr. Bur. PI. Ind. Bull. 68: 



38. pt. 20. 1905. 



Culms 20-120 cm. tall, smooth or scalirous below the panicle ; sheaths smooth or somewhat 

 scabrous ; ligule prominent ; blades flat. 1-8 mm. wide ; panicle narrow, somewhat open, or 

 close and spikelike, sometimes interrupted, 1-25 cm. long ; glumes acute or awn-pointed, 

 nearly equal. 2.5-3.5 mm. long, scabrous on the keel and often also on the hack; lemma about 

 2 mm. long; awnless or bearing from about the middle of the back a straight or bent exserted 

 awn ; palea minute, less than .5 mm. 



Moist or rather dry open ground, from the seacoast up to the Iludsonian Zone; Alaska to Mexico, east 

 to the Rocky Mountains. Tune-Aug. Type locality: Alaska. 



A. glomerata is a seacoast form with dense panicles, inflated sheaths, and awned or awnless lemma; 

 A. microphylla is a form with dense, often interrupted panicles and awned lemma. A. ampla has a somewhat 

 onen panicle and awned lemma. 



