WOOTON" AND STANDLEY FLORA OF NEW MEXICO. 93 



1. Koeleria ciistata (L.) Pers. Syn. PI. 1: 97. 1805. 



Aira cristata L. Sp. PI. 63. 1753. 



Type locality: "Habitat in Angliae, Helvetiae siccioribus." 



Range: British America to Arizona, Kansas, and Pennsylvania; also in Europe. 



New Mexico: Common in all the mountain ranges. Open slopes and in woods, in 

 the Transition Zone. 



61. ERAGROSTIS Beauv. 



Annuals or perennials with simple or branched culms; spikelets 2 to many-flowered, 

 the uppermost floret imperfect; rachilla jointed but sometimes not disarticulating 

 until alter the fall of the lemmas; glumes more or less unequal, usually shorter than 

 the lemma; lemmas glabrous, obtuse or acute, aAvnless, 3-nerved, the lateral nerves 

 often faint; paleas shorter than the lemmas, often persistent, 2-nerved. 



KEY TO THE SPECIES. 



Annuals. 



Spikelets broad, more than 2 mm. wide 1. E. megastachya. 



Spikelets narrow, 1.5 mm. wide or less. 



Plants low, spreading, 30 cm. high or less; leaves nar- 

 row; spikelets many-flowered; plants of cultivated 



fields and river valleys 2 . E. pilosa. 



Plants tall, 30 to 100 cm.; leaves broad; spikelets few- 

 flowered; plants usually found in the mountains. 

 Panicles spreading, often nearly 30 cm. long; spikelets 



5 to 8 mm. long 4. E. mexicana. 



Panicles contracted, 10 cm. long or less; spikelets 3 



to 6 mm. long 3. E. limbata. 



Perennials. 



Plants with rigid scaly rootstocks; leaves pimgent-poin ted 5. E. obtusiflora. 



Plants tufted, without rootstocks; leaves not pungent-pointed. 



Sjjikelets crowded, on very short branches 6. E. secundiflora. 



Spikelets not crowded, on long slender branches. 



Panicles narrow and elongated, the branches long 

 and flexuous, erect or nearly so; lateral nerves 



of the lemmas evident 7. E. trichodes. 



Panicles rather open, the branches spreading or 

 ascending, rather rigid; lateral nerves of the 

 lemmas e\ident or obscure. 

 Lateral nerves of the lemmas faint; plant of the 



mountains 8. E. lugens. 



Lateral nerves of the lemmas very prominent; 

 on the plains of the eastern part of the 

 State 9. E. pectinacea. 



1. Eragrostis megastachya (Koel.) Link, Hort. Berol. 1: 187. 1827. 



Stink grass. 



Briza eragrostis L. Sp. PI. 70. 1753, not Poa ei-agrostis L. op. cit. 68 {=Eragrostis 

 eragrostis) . 



Poa megastachya Koel. Descr. Gram. 181. 1802. 



Eragrostis major Host, Icon. Gram. Austr. 4: 14. pi. 24- 1809. 



Eragrostis poaeoides megastachya A. Gray, Man. ed. 5. 631. 1867. 



Type locality: European. 



Range: Nearly throughout the United States; naturalized from Europe. 



New Mexico: Cedar Hill; Santa Fe; Pecos; Las Vegas Hot Springs; Mangas Springs; 

 Dog Spring; Berendo Creek; West Fork of the Gila; Organ .Mountains; Tularosa; 

 Roswell; Meeilla Valley; CarLbad; Texico. Waste ground. 



