348 MISC. PUBLICATION 200, TJ. 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. Qt — 



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 roor> 

 ing at the nodes, 15 

 to 60 cm 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. % (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 rootin^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. Ql — 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 California ; 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 

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

 anthers about 0.5 mm long. (A. ramosus 

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

 places, New Jersey to British Columbia, south 

 to Florida. Texas, Arizona, and California 

 (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. 



Figure 711.— Alopecurus pal- 

 lescens. Panicle, X 1; glumes 

 and floret, X 10. (Piper 4208, 

 Wash.) 



