132 



GRASSES OF IOWA. 



Agrostis sobolifera Muhl. Willd. 

 Enum. 95. Ih09. 



DESCRIPTION". 



Rock Muhlenbergia. A slen- 

 der perennial, with more or less 

 branching, leafy culms I to 2 

 feet (3-6 dm.) high, from creep- 

 ing, scaly rootstocks. Sheaths 

 smooth or slightly scabrous; ligule 

 very short ; leaf-blade flat, 1 to 3 

 lines (2-6 mm.) wide, 3 to 5 

 inches (6-10 cm.) long, scabrous. 

 Panicle 2 to 7 inches (4-16 cm.) 

 long, filiform, with erect, appressed 

 branches. Spikelets crowded, I line 

 (2 mm.) long or less. Empty 

 glumes ovate-lanceolate, acute, muc- 

 ronate, or sub - aristate - pointed, 

 nearly equal, one-fourth to one-half 

 shorter than the flowering glume ; 

 Howering glume ovate-lanceolate, 3- 

 nerved, short mucronate, scabrous 

 on the back, short-pilose toward the 



Fig. 95 Muhienbergia sobolifera— a, base and on the callus; palea as long 

 8pikelet,b, emoty lower glume; c flower- the flower i n g gl urae . Rockv 



ing glume; d, palet; e, fruit. (Charlotte M. 



King.) woods. September-October. 



DISTRIBUTION. 



Iowa. Winterset, 1103 (Carver); Muscatine (Pammel) ; Ft. 

 Dodge (Oleson). 



A or//; America. Massachusetts south to Virginia, Texas, Illinois, 

 Indiana, Missouri (Eggert), to southeastern Minnesota. 



2. MUHLENBERGIA MEXICANA. 



Muhienbergia Mexicana Trin. Unifl. 189. 1824. Watson and Couiter. 

 Gray. Man. Bot. 643. 1890. (6th ed.) Scribner. Grasses of Tenn. Full. 

 •Jniv. Tenn. Agrl. Exp. Sta. 7: 68. /. S3. 1894. Vasey Contr. U. S. Nat. 

 Herb. 3: 69. 



