H Equisetaceae 



pinnas lanceolate-ovate, irregularly pinnati- 

 fid with a broad central space, and bluntly 

 or sharply toothed segments, decurrent 

 along the margined or winged rachis; sori 

 small, half way between the margin and the 

 midrib; indusium narrow, soon withering. 



In crevices in rocks and among broken 

 stones throughout the Rockies. 



Filix mon- Rootstock slender, widely creep- 

 tana (Lam.) ing; stipes 6-9 inches long, slen- 

 Underw. der; leaves deltoid-ovate, 3-4 

 pinnate, 3-6 inches broad, the lowest pinnae 

 triangular-lanceolate and much larger, their 

 inferior pinnules i-ij inches long, deeply di- 

 vided into oblong lobes, deeply toothed ; sort 

 numerous; indusium acute, soon withering. 

 On damp mossy banks and rocks through- 

 out the Rockies; not common. 



EQUISETACE.E 

 Horsetail Family 

 Green, rush-like plants with usually hollow, 



