WOOTON AND STANDLEY FLORA OF NEW MEXICO. 85 



47. SCHEDONARDTJS Steud. Texan crabgrass. 



Low, diffusely branched perennial with short narrow leaves and slender paniculate 

 spikes; spikelets 1-fiowered, hermaphrodite, sessile, scattered along one side of the 

 slender rachis of the widely spreading spikes; rachilla jointed above the glumes, these 

 narrow, slightly unequal, membranaceous; lemmas longer tlian the glumes, mem- 

 branaceous, becoming somewhat rigid, acuminate or minutely mucronate; stamens 3; 

 styles distinct; grain inclosed within the rigid lemmas and palea but free. 



1. Schedonardus paniculatus (Nutt.) Trel. Rep. Ark. Geol. Surv. 1888^: 236. 1891. 



Lepturus paniculatus Nutt. Gen. PI. 1: 81. 1818. 



Schedonardua texanus Steud. Syn. PI. Glum. 1: 14G. 1855. 



Type locality: "On dry saline plains, near Fort Mandan, on the Missouri." 



Range: Manitoba and Saskatchewan to New Mexico and Texas. 



New Mexico: From the Mogollon and White Mountains northward and eastward 

 throughout the State. Dry hills and plains, in the Upper Sonoran Zone. 



48. BOTJTELOXJA Lag. Grama grass. 



Low annuals or perennials, with narrow, flat or convolute leaves and few or many 

 unilateral spikelets nearly sessile along a common rachis; spikelets 1 or 2-flowered, 

 numerous, crowded and closely sessile in 2 rows along one side of a continuous flattened 

 rachis, this usually projecting beyond the spikelets; rachilla articulated above the 

 glumes, the continuation beyond the hermaphrodite floret usually bearing a few 

 rudimentary glumes and 3 awns; glumes unequal, the lower smaller, keeled; lemma 

 broader, 3-nerved, 3 to 5-toothed or cleft; palea 2-nerved and 2-toothed; grain free. 



KEY TO THE SPECIES. 



spikes numerous, 5 to 60; spikelets few, usually less than 12. 



Spikes 30 to 60, each with 4 to 10 spikelets 1. B. curtipendula. 



Spikes 5 to 11, each with 3 to 6 spikelets 2. B. radicosa. 



Spikes few, 1 to 6; spikelets numerous, 25 or more. 

 Annuals. 



Spikes solitary; plants low, tufted 3. B. procumbens. 



Spikes more than one; plants various. 



Spikelets closely appressed to the rachis, forming a 



cylindrical spike 4. B. aristidoides. 



Spikelets crowded on one side of the rachis, making it 

 one-sided . 



Plants 30 cm. high or more, the stems erect 5. B. parryi. 



Plants 10 to 15 cm. high, the stems spreading. . 6. B. barbata. 

 Perennials. 



Spikes loose, more or less cylindric; lower part of stems 



densely woolly 7. B. eriopoda. 



Spikes with more numerous crowded spikelets, one- 

 sided; stems not woolly. 



Glumes smooth or slightly roughened 8. B. breviseta. 



Glumes stiff -hairy. 



Spikes 3 to 5, short and broad; rachia extended 



much beyond the spike 9. B.hirsuta. 



Spikes 1 to 3, mostly 2, long and narrow; rachis 



but slightly extended 10. B. gracilis. 



1. Bouteloua curtipendula (Michx.) Torr. in Emory, Mil. Reconn. 154. 1848. 



Tall grama. 

 Chloris curtipendula Michx. Fl. Bor. Amer. 1: 59. 1803. 

 Bouteloua racemosa Lag. Var. ?ienc. 2*: 141. 1805. 



