92 CONTEIBUTIONS FROM THE NATIONAL HERBAEIUM. 



Range: Western Texas and southern New Mexico. 



New Mexico: Tortugas Mountain {Wooton 2018). Dry fields, in the Lower Sono- 



ran zone. 



69. SPHENOPHOLIS Scribn. 



Hather slender tufted perennials with flat leaves and narrow terminal many -flowered 

 panicles; spikelets 2 or 3-flowered; rachilla jointed above the glumes and between 

 the florets and produced above the upper floret into a slender naked bristle; glumes 

 slightly shorter than the florets, the first very narrow or linear and 1-nerved, the 

 second broadly obovate, 3-nerved, with rather broad scarious margins; lemmas obtuse, 

 usually awnless; palea narrow, 2-nerved; styles distinct, short; grain narrow, free. 



KEY TO THE SPECIES. 



Second glume not much, if at all, wider than the lemmas, obtuse or 



acute 1. S. pollens. 



Second glume much \vider than the lemmas, rounded or truncate and 

 somewhat cucuUate at the apex. 

 Intermediate nerves of the second glume faint; leaves narrow; 



panicle very narrow, dense and spikelike 2. S. obiusala. 



Intermediate nerves of the second glume almost as prominent as 

 the principal ones; leaves wide; panicle longer and 

 broader, loose 3. S. robusta. 



1. Sphenopholis pallens (Spreng.) Scribn. Rhodora 8: 145. 1906. 

 Aira pallens Spreng. Mant. Fl. Hal. 36. 1807. 



Koeleria pennsylvanica DC. Cat. Hort. Monsp. 117. 1813. 

 Eatonia pennsylvanica A. Gray, Man. ed. 2. 558. 1856. 

 Type locality: Not stated. 



Range: British America to New Mexico, Texas, and Georgia. 

 New Mexico: Mouth of Mora River; Albuquerque; Santa Fe Canyon 9 miles east 

 of Santa Fe. Wet ground, in the Transition Zone. 



2. Sphenopholis obtusata (Michx.) Scribn. Rhodora 8: 144. 1906. 

 Aira obtusata Michx. Fl. Bor. Amer. 1: 62. 1803. 



Eatonia obtusata A. Gray, Man. ed. 2. 558. 1856. 



Type locality: "Habitat in aridis a Carolina ad Floridam." 



Range: British America to Oregon, Arizona, and Florida. 



New Mexico: Farmington; Camzo Mountains; Albuquerque; Zuni; Socorro; 

 Kingston; Organ Mountains. In wet ground, especially along ditch banks, in the 

 Upper Sonoran Zone. 



3. Sphenopholis robusta (Vasey) Heller, Muhlenbergia 6: 12. 1910. 

 Eatonia obtusata robusta Vasey, Contr. U. S. Nat. Herb. 3: 190. 1895. 

 Eatonia robusta Rydb. Bull. Torrey Club 32: 602. 1905. 



Type locality: Mullen, Nebraska. 

 Range: Washington and Nebraska to Arizona. 



New Mexico: Rio Mimbres; Mesilla. Damp meadows, in the Lower and Upper 

 Sonoran zones. 



60. KOELERIA Pers. June grass. 



Cespitose perennials with usually flat narrow leaves and densely flowered spikelike 

 panicles; spikelets 2 to 4-flowered, compressed; rachilla jointed above the glumes, 

 these unequal, keeled, somewhat shorter than the lemmas; lemmas membranaceous, 

 faintly 3 to 5-nerved, obtuse, acute, or mucronate-pointed; palea hyaline, acute, 

 2-nerved, about as long as the lemma; stamens 3; styles very short. 



