KEY To THE SELAGINELLAS. 



I. Leaves narrow, all alike . 



Stems pendant, rooting throughout. Western 



*S". Oregana 

 Stems erect, rooting at base only. Western 



S. Bigelovtt 



Stems creeping and tufted .... 



Branchlets under Y& of an inch long. Western 



S. cinerascens 



Branchlets longer ..... 

 Leaves tipped with a point. Western 



S. Wat son i 

 Leaves tipped with a white bristle 



Leaves closely appressed. Southern 



5. areuicola 

 Leaves somewhat spreading. Eastern 



5. rupestrts 

 Fertile stems larger than the sterile. Northern 



5. spinosa 

 II. Leaves broader, of two sizes . 



Plants weak, trailing, rooting throughout 



Fertile spike roundish, leafy . S. apits 



Fertile spike four-sided. Western S. Douglassi 

 Plants slender, erect or ascending. Southern 



S. Ludffviciana 

 Plants stout, densely tufted, rooting only at base 



Leaves obtuse, awnless . S. leptdophyHa 



Leaves awn-tipped . . S. Pringlet 



