112 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



3. Alopecurus carolinianus Walt., Fl. Carol. 74. 1788. 



Payson (Gila County), Rincon Mountains (Pima County), about 

 5,000 feet, wet ground, May to June. New Jersey to British Colum- 

 bia, south to Florida, Arizona, and California. 



36. POLYPOGON 



Decumbent annuals or perennials with flat, scabrous leaf blades, ana 

 dense, narrow or spikelike panicles; glumes equal, entire or minutely 

 lobed, awned from the tip or from between the lobes, the awns slender, 

 usually longer than the glumes; lemma thin, hyaline, about half as long 

 as the glumes. 



Key to the species 



1. Plants annual; glumes minutely lobed, the awns very slender, 6 to 8 mm. long; 



panicles very dense, spikelike 1. P. monspeliensis. 



1. Plants perennial; glumes not lobed, the awn not more than 5 mm. long; panicles 

 moderately dense (2) . 

 2. Glumes abruptly narrowed above, the awn 2.5 to 5 mm. long. 



2. P. LUTOSUS. 

 2. Glumes gradually tapering into a short awn, this 1 to 2 mm. long. 



3. P. ELONGATUS. 



1. Polypogon monspeliensis (L.) Desf., Fl. Atlant. 1: 67. 1798. 



Alopecurus monspeliensis L., Sp. PL 61. 1753. 



Coconino, Yavapai, Pinal, Maricopa, Pima, and Cochise Counties, 

 waste places at low altitudes, April to October. New Brunswick to 

 Alaska, south to Virginia, mostly near the coast, and common in the 

 Western States from Washington to Nebraska, south to Texas, Ari- 

 zona, and California; introduced from Europe. 



Sometimes known as rabbitfoot grass. 



2. Polypogon interruptus H. B. K., Nov. Gen. et Sp. 1: 134. pi. 44. 



1815. 



Alopecurus interruptus Poir. in Lam., Encycl. Sup. 5: 495. 1817. 



Apache, Navajo, Pima, and Santa Cruz Counties, along ditches 

 and streams at low altitudes, May to September. British Columbia 

 to California and Arizona, east to Louisiana; Mexico to Argentina. 



3. Polypogon elongatus H. B. K., Nov. Gen. et Sp. 1: 134. 1815. 

 Madera Canyon, Santa Rita Mountains, Pima County (Silveus 



3488), along ditches, streams, and in wet places. Arizona; Mexico to 

 Argentina. 



37. LYCURUS. Wolftail 



Rather low, slender, tufted perennial with short narrow leaf blades 

 and narrow, bristly spikelike panicles; spikelets in pairs, the lower one 

 sterile; glumes equal, the first usually 2-awned, the second 1-awned; 

 lemma longer than the glumes, tapering into a slender awn, pubescent 

 on the margins; palea acute, nearly as long as the lemma, pubescent. 



1. Lycurus phleoides H. B. K., Nov. Gen. et Sp. 1: 142. 1815. 



Apache, Yavapai, Pinal, Cochise, Pima, and Santa Cruz Counties, 

 4,000 to 6,000 feet, dry rocky hills and plains, July to October. Colo- 

 rado and Utah to Texas, Arizona, and Mexico. 



