MANUAL OF THE GRASSES OF THE UNITED STATES 



415 



Figure 590. — Sporobolus pulvinatus. Panicle, X 1; 

 glumes and floret, X 10. (Type.) 



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,id 



Figure 591. — Sporobolus patens. Panicle, X 1; glumes 

 and floret, X 10. (Type.) 



1. Sporobolus pulvinatus Swallen. 

 (Fig. 590.) Culms 5 to 30 cm. tall in 

 small erect or spreading tufts; blades 

 mostly 4 to 7 cm. long, 2 to 5 mm. 

 wide, lanceolate-acuminate, scabrous, 

 the uppermost much reduced; pan- 

 icles 2 to 5 or rarely to 8 cm. long, 

 pyramidal, the branches erect to 

 spreading, densely flowered, usually 

 naked at the base; spikelets 1.5 to 1.7 

 mm. long, appressed; first glume min- 

 ute, the second as long as the spike- 

 let, abruptly acute or subobtuse; 

 lemma acute or subobtuse; palea 

 broad, conspicuous, as long as the 

 lemma. O — Sandy land, Texas, 

 New Mexico, and Arizona; northern 

 Mexico. 



2. Sporobolus patens Swallen. (Fig. 

 591.) Culms 10 to 25 cm. tall, slender, 

 erect; sheaths glabrous, sparsely his- 

 pid at the throat, the uppermost elon- 

 gate, almost bladeless; blades 1 to 

 3.5 cm. long, 1 to 2 mm. wide, flat, 

 scabrous on the margins; panicles 

 pyramidal, 2.5 to 5 cm. long, the 

 slender branches spreading or even 

 reflexed, few-flowered, the branchlets 

 abruptly spreading; spikelets 1.8 to 2 

 mm. long, the pedicels slender, 

 spreading, as much as 3 mm. long; 

 first glume minute; second glume and 



Fl ZZ SsfSctf&Effi lemma equal, acute; palea shorter 

 floret, x io. (Deam 39615, than the lemma, truncate, minutely 



Ind.) ' ' J 



