180 GRA.MIXEAE 



2-toothed iit apex, awned between the teeth, the eallus liairy. PaU^a equaling or 

 exceeding the lenniia. acutely 2-toothed. A low slender amnial with short 

 narrow blades and slender spikes. — Species 1, California to Washington. (Prof. 

 F. Lamson-Scribner, an emiaent American agrostologist.) 



1. S. bolanderi Ha<'k. Culms 3 to 12 inches high, tufted, erect or ascending; 

 spike slen<ler, about 1 1' lin*? thick, the joints 2 to 3 lines long. 



Sandy or sterile ground, in the mountains. California to Washington ; rare. 



Locs. — Bigoak Flat, Tuolumne Co., Conydun ; Wawona to Yosemite, Chtisc 5707; Mariposa, 

 Congdon; Northfork, Griffiths 4585. 4600; Dunlap to Millwood, Griffiths 4659. 



Eefs. — ScRlBNERU BOLANDERI Hack. Bot. Gaz. 11: 105. 1886; Davy in Jepsun. Fl. W. Mid. 

 Cal. 74. 1901. Leptiirvs holauderi Thurb. in Wats. Bot. C'al. 2: 322. 1880, type from Russian 

 River, Bolander 4669. 



(!7. AGROPYRON Gacrtn. 

 Spikelets several-tiowered, solitary (or rarely in pairs), sessile, placed flat- 

 wise at each joint of the rachis, forming spikes. Glumes equal, firm, several- 

 nerved, usually shorter than the .spikelet, usually acute or awned. Lemmas 

 convex, rather firm, 5 to 7-nerved, usually acute or awned from apex. Per- 

 ennials. — Species about 35. in all temperate regions. (Greek agros. a field, and 

 puros, wheat.) 

 Plants producing rhizomes. 



Lenuuas scabrous-pubescent 4. A. siihvillosiim. 



Lemmas glabrous. 



Blades thin and flat, sparsely hairy above 2. A. reiitiix. 



Blades involute in drying, firm, glabrous. 



Glumes obtuse 1. A. juiici iim. 



Ghmies acuminate 3. A. smithii. 



Plants not producing rhizomes. 

 Awn of lemma short or wanting. 



Nodes pubescent ; spikelets distant 5. A. parixhii. 



Nodes glabrous; spikelets approximate 7. A. teiimiiii. 



Awn of lemma as long as body or longer. 

 Awn straight or slightly spreading. 



Glumes awned ; spikelets approximate 8. A. caiiiiiiim. 



Glumes unawned ; spikelets rather distant. 



Glumes obtuse or notched; plant more than 3 feet tall 6. .4. larvr. 



Glumes acute ; plant less than 3 feet tall 9. A. riisnji. 



Awn widely spreading or recurved. 



Glumes acute, awnless 10. A. srnhniiii. 



Glumes awned. 



Glumes 2-nerved, the awns long and recurved; axis readily disarticulating. 



( 'ulms erect 11- A. fiexuosum. 



Culms ascending or spreading 12. A. scrihneri. 



Glumes 3 to 5-nerve<I, the awns short, straight; axis not disarticulating 



13. A. prinahi. 



1. A. junceum Beauv. Culms 1 to 2 feet high, decunibcnt at liase. producing 

 creeping rhizomes; blades involute, firm, smooth below: spike stout, easily 

 disarticulating at the joints; spikelets compressed, smooth, S to 15 lines long; 

 glumes oblong, obtuse, rather faintly many-nerved; lemmas obtuse, awnless, 

 the midrib sometimes extending as a point. 



Sandy sea-coast of Euroiie and North Africa. The only specimen from Cali- 

 fornia was collected at the outlet of Lake Merced, near San Fram-isco. by -I. \V. 

 Congdon. This is the form with large spikelets about 1 inch long ( fi niarro- 

 stachyum Lange). which however is scarcely worthy of varietal rank. 



Refs. — Agropyron juxceum Beauv. Ess. Agrost. 102, 146. 1812. Trilinim junrciun L. Mant. 

 2: 327. 1771. 



