348 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



FIGURE 710. Distribution of 

 Alopecurus alpinus. 



FIGURE 709. Alopecurus alpinus. 

 Panicle, X 1; glumes and floret, X 10. 

 (Hall and Harbour 682, Colo.) 



dense, 2 to 7 cm long, 4 to 6 mm thick; glumes about 3 mm long, ciliate 

 on the keel, appressed-pubescent on the sides; awn attached near base 

 of lemma, exserted 3 to 5 mm; anthers about 2 mm long. 91 



Edges of ponds and wet places, Idaho 

 to Washington and northern California 

 (fig. 712). 



5. Alopecurus aequalis Sobol. SHORT- 

 AWN FOXTAIL. (Fig. 713.) Perennial; 

 culms erect or spreading, usually not root- 

 ing at the nodes, 15 



to 60cm tall; blades 



1 to 4 mm wide; 

 panicle slender, 2 to 

 7 cm long, about 4 

 mm wide; spikelets 



2 mm long; awn of 

 lemma scarcely ex- 

 serted; anthers 



about 1 mm long. 91 (A. aristulatus 

 Michx.) In water and wet places, Green- 

 land to Alaska, south to Pennsylvania, 

 Illinois, Kansas, New Mexico, and Cali- 

 fornia (fig. 714); Eurasia. 



6. Alopecurus geniculatus L. WATER 

 FOXTAIL. (Fig. 715.) Differing from A. 



aequalis chiefly in the usually more decumbent culms rooting at 

 the nodes and the longer awn exserted 2 to 3 mm; giving the panicle 

 a softly bristly appearance; spikelets about 2.5 mm long, the tip dark 

 purple; awn of lemma about as long again as the spikelet; anthers 

 about 1.5 mm long. 91 In water and wet 

 places, Newfoundland to Saskatchewan and 

 British Columbia, south through New England 

 to New York, New Jersey, and Virginia, and 

 through Washington to Calif ornia ; Montana, 



Colorado, Arizona (fig. 



716); Eurasia. 

 7. Alopecurus carolini- 



anus Walt. (Fig. 717.) 



Annual; culms tufted, 



much branched at base, 



10 to 50 cm tall; similar 



to A. geniculatus and A. 



aequalis, but panicle more 



slender than in the former; spikelets 2 to 2.5 

 mm long, pale, the awn as in A. geniculatus; 

 anthers about 0.5 mm long, o (A. ramosus 

 Poir.) Moist open ground, old fields, and wet 



i XT T -L T> *j.* i r~i i i** J.T_ FIGURE 711. Alopecurus pal- 



places, New Jersey to British Columbia, south usccns. Panicle, xi; glumes 

 to Florida, Texas, Arizona, and Calif ornia Sjl?* 1 '* 10 - ( pi P er4208 - 

 (fig. 718). 



8. Alopecurus howellii Vasey. (Fig. 719.) Annual; culms 15 to 

 30 cm tall, commonly geniculate at lower nodes; sheaths, especially 

 the uppermost, more or less inflated ; panicle oblong to linear, 2 to 6 



FIGURE 712. Distribution of 

 Alopecurus pallescens. 



