CATALOGUE. 287 



Bouteloua gracilis, Hook.! — Low, 6-12', densely csespitose, much 

 branched at the base; leaves short (1-2'), flat; spike with 6-10 slender 

 spikelets, about £' long, nearly sessile, with two to three sterile flowers or 

 bractlets, one perfect flower, and a rudiment which is 3-awned and longer 

 than the perfect flower. This species is related to B. curtipendula, but much 

 smaller and more delicate. — Riley's Well, Arizona, 1874 (701) [A sparse 

 but good forage. — J. T. R] 



Bouteloua polystachya, Benth. — Culms low, caespitose (about 6-12'), 

 smooth; leaves 1' long, acute, ciliate at the top of the sheath; racemes 

 numerous, graceful ; spikes :'-5, subsessile, 4-6" long, erect ; spikelets J to 

 ^' long; rachis compressed, margin minutely puberulent; flowers in two 

 series on the rachis; glumes hyaline, lower one small, upper one with a 

 short awn ; palets 2-lobed, the lower with 3 awns, upper with 2? rudiments 

 with 3 awns, which equal those of the flower. — Arizona, 1871 and 1872 ; 

 Gila Valley, 1874 (770, 352). 



Bouteloua polystachya, var. major? — I use this name provisionally 

 to designate a grass larger in all its parts than the preceding. Culms 1-1 £° 

 high; racemes with mostly 5-7 spikelets, which are about 1' long, rather 

 on one side of the culm, sessile or nearly so, about 1' distant ; culms some- 

 what branched below, rather leafy; leaves flat, 3-4' long, scabrous on the 

 margin. Probably this has been described as a distinct species. — Sanoita 

 Valley, Arizona, 1874 '(691, 347). 



Bouteloua Humboldtiana, Griseb. 1 — Under this name I have placed 

 specimens from New Mexico, because of their correspondence to Cuban speci- 

 mens of that name in the Herbarium. I do not know where the description 

 is given. The grass is about 1J° high, upper leaf very short; raceme 2-3' 

 long, of 4-6 spikes, each of which is about J' long, wide at the top, tapering 

 below, of 4-6 long awned spikelets. — Camp Bowie, Arizona, 1874 (484). 



Bouteloua juncifolia, Lag. — Culms 1^-2° high, much branched 

 below, leafy; leaves broadly linear-lanceolate, 4-6' long, rather stiff, 

 smooth panicle or raceme of 6-12 distant, rather coarse spikes, £-§' 

 long, each of 5-7 spikelets ; glumes lanceolate, nearly as long as the per- 

 fect flower, acute, scabrous on the mid-nerve; lower flower perfect, upper 

 ones staminate ; lower palets of perfect flower tridentate, its terminal awn 



