Key To The Selaginellas. 



I. — Leaves narrow, all alike . , . . . 



Stems pendant, rooting throughout. Western 



S. Oregana 

 Stems erect, rooting at base only. Western 



5. Bigeloi'ii 

 Stems creeping and tufted .... 



Branchlets under H of an inch long. Western 



5. cinerascens 

 • Branchlets longer . 



Leaves tipped with a point. Western 



6'. H'a/soni 

 Leaves tipped with a white bristle 



Leaves closely appressed. Southern 



S. arenicola 

 Leaves somewhat spreading. Eastern 



6'. riipestris 

 Fertile stems larger than the sterile. Northern 



S. spinosa 

 IL — Leaves broader, of two sizes .... 



Plants weak, trailing, rooting throughout 



Fertile spike roundish, leafy . S. apiis 



Fertile spike four-sided. Western S. Douglassi 

 Plants slender, erect or ascending. Southern 



5. Lttdoziici'ana 

 Plants stout, densely tufted, rooting only at base 



Leaves obtuse, awnless . 5. lepidophylla 



Leaves awn-tipped , . S. Pringlei 



