398 MISC. PUBLICATION 200, U. S. DEPT. OF AGKICULTURE 



SPOROBOLUS ASPER var. PILOSUS 

 (Vasey) Hitchc. Sheaths and blades 

 more or less pilose. Q\. (S. pilosus 

 Vasey.) Prairies and rocky hills, Kansas 

 (Saline County and westward), Texas 

 (Del Rio). 



SPOROBOLUS ASPER var. HOOKERI 

 (Trin.) Vasey. Less robust, the more 

 slender fewer-flowered panicle looser; 

 spikelets usually smaller, 3 to 5 mm 

 long. 91 (S. attenuatus Nash; S. 

 drummondii Vasey.) Plains, Missouri, 

 Mississippi, Texas, and Oklahoma. 

 Foliage rarely somewhat villous. 



9. Sporobolus ma cms (Trin.) Hitchc. 

 (Fig. 826.) Perennial, with short scaly 

 rhizomes; culms erect, 50 to 70 cm 

 tall; blades flat, 10 to 20 cm long, 1 

 to 2 mm wide, sometimes wider, pilose 

 on the upper surface near base and 

 at the throat of the sheath; panicle 

 narrow, often enclosed at base, 5 to 15 

 cm long, the bran- 

 ches erect; spike- 

 lets 4 to 5 mm long, 



the glumes keeled, 

 the first about 

 two-thirds as long, 

 the second a little 

 longer than the 

 first; lemma and 



palea subequal, the tips boat-shaped. 

 01 Wet pineland, Oklahoma, Mis- 

 sissippi, and Louisiana. Except for 

 the rhizomes this species resembles S. 

 asper var. hookeri. 



10. Sporobolus clandestinus (Spreng.) 

 Hitchc. (Fig. 827.) Perennial; culms 

 relatively stout to slender, erect to 

 spreading, 50 to 100 cm tall; lower 

 sheaths sometimes pilose; blades flat, 

 becoming involute, with a long fine 

 point; panicle narrow, contracted, 5 to 

 10 cm long, usually partly enclosed; 

 spikelets 5 to 7 mm long, the glumes 

 keeled, acute or subacute, the first more 

 than half as long as the spikelet, the 

 second longer than the first; lemma 

 sparsely appressed-pubescent, acuminate, 

 the palea longer, sometimes as much as 

 10 mm long. 91 (S.canovirens Nash.) 

 Sandy fields, pine barrens, hills, and prai- 



FIGUEE 824. Sporobolus asper. Plant, x ries, Connecticut to Illinois and Kansas, 

 I 2 7ot e d s .) and floret ' x ia (Deam south to Florida and Texas (fig. 828). 



FIGURE 825. Distribution of 

 Sporobolus asper. 



