Equisetaceae 1 5 



jointed, simple or often much branched 

 stems, rising from subterranean rootstocks; 

 the branches verticillate. 



Leaves reduced to toothed sheaths; spo- 

 ranges clustered beneath the scales of 

 terminal, cone-like spikes. 



Equisetum Stems annual, the fertile .ap- 

 arvense L. pearing in early spring before 

 Field Horse- the sterile; fertile stems 4-10 

 inches high, soon withering, 

 light brown, their loose sheaths mostly dis- 

 tant, whitish, ending in about 12 brown 

 acuminate teeth; sterile stems green, much 

 branched and slender, 2 inches to 2 feet high 

 with numerous, mostly simple, 4-angled 

 solid branches with 4-toothed sheaths. 



In moist sandy soil throughout the region, 

 frequent in wet woods and swampy places. 



Stems annual, the fertile ap- 

 Equisetum 



sylvaticum pearing in early spring before 

 L. Wood the sterile, at first simple, at 

 Horsetail. length much branched, resem- 

 bling the sterile except in the withered apex ; 



