FLOWERING PLANTS AND FERNS OF ARIZONA 93 



Poa canbyi (Scribn.) Piper. The specimen of this species in the U. S. National 

 Herbarium, which is the basis of the Arizona record in Hitchcock's Manual, is 

 labeled as from Fillmore. There is no locality of this name in Arizona, so it is 

 assumed that the specimen is from Utah and should not be credited to Arizona. 



6. ERAGROSTIS. Lovegrass 



Annuals or perennials with open panicles; florets closely imbricate; 

 rachilla disarticulating above the glumes and between the florets, or 

 continuous; lemmas deciduous; paleas persistent, about as long as the 

 lemmas. 



This genus has comparatively little forage value. Probably the 

 best Arizona species in this regard is plains lovegrass (E. intermedia). 

 Alkali lovegrass (E. obtusiflora) furnishes a large part of the forage 

 locally in extremely saline soils in Cochise County. The seeds of teff 

 (E. abyssinica) are utilized for food in Africa. Stinkgrass (E. cili- 

 anensis), with an odor of cockroaches, is reported sometimes to poison 

 horses, both the fresh plant and in hay. 



Key to the species 

 1. Plants perennial (2). 



2. Plants with stout creeping rhizomes bearing hard, closely imbricate scales; 

 culms firm, wiry, erect or ascending; lemmas erose_ 11. E. obtusiflora. 

 2. Plants cespitose, without rhizomes (3). 



3. Nerves of the lemma obscure; lemmas rounded on the back, 1.8 to 2 mm. 



long 14. E. INTERMEDIA. 



3= Nerves of the lemma prominent (4). 



4, Panicles purple, the branches stiffly spreading; culms 30 to 60 cm. high: 

 lemmas about 1.5 mm. long 12. E. spbctabilis. 



4, Panicles lead colored, the branches slender, drooping; culms usually 

 more than 1 meter high; lemmas about 2.5 mm. long. 



13. E. CURVULA. 



1. Plants annual (5). 

 5. Plants with minute glandular depressions on the branches, or on the keels of 

 the lemmas (6). 

 6. Spikelets 2.5 to 3 mm. wide; keels of the lemmas with a few prominent 

 glandular depressions; panicles open, dark gray green or tawny. 



1. E. CILIAXEXSIS. 



6. Spikelets 1 to 1.5 mm. wide; keels of the lemmas without glands; panicles 



narrow, the branches ascending or appressed, yellowish green. 



2. E. LUTESCEXS. 



5. Plants not glandular, or with a few scattered glands on the sheaths (7) . 



7. Spikelets about 1 mm. wide (8). 



8. Plants delicate; spikelets 3 to 5 mm. long; lemmas 1 to 1.5 mm. long. 



3. E. pilosa. 



8. Plants rather stou^; spikelets 5 to 7 mm. long; lemmas about 2 mm. 



long 4. E. ORCUTTIAXA. 



7. Spikelets 1.5 mm. wide or wider (9). 



9. Panicles narrow, the short branches stiffly ascending or spreading, few- 



flowered, bearing spikelets nearly to the base_ 5. E. barrei.ieri. 

 9. Panicles open, diffuse, the branches slender, usually somewhat drooping 

 (10). 

 10. Spikelets appressed along the main branches of the panicle or the 

 appressed primary branchlets (11). 

 11. Panicle branches simple; spikelets rather distant. 



6. E. PECTIXACEA. 



11. Panicle branches compound; spikelets somewhat crowded. 



7. E. DIFFUSA. 

 10. Spikelets on usually slender spreading pedicels (12). 



12. Spikelets linear; pedicels stiff, widely divergent, longer than the 



spikelets S. E. arida. 



