IS THE FERX BULLETIN 



north ; also in central and northern Europe and 

 Asia — E. limosum L. 



The form intermedium A. A. Eaton, re- 

 sembles forms of E. litoralc. f. Iinosum L. is a 



nearly nnbranched form found with the type. 



224. Equisetum Funstoni A. A. Eaton. Not un- 



common : in moist places Southern California, 

 probably in Mexico. The plants to which this 

 name has been given were referred in older 

 floras to E. Mexicanum and E. ramosissimum, 

 two species not now considered members of our 

 flora. 



225. Equisetum hiemale L. Scouring Rush ; 



Winter Rush. Common; in moist places. 

 Nearly throughout North America and extend- 

 ing across Northern Europe and Asia. 



The forms affine, Californicum, Doelli, 

 Drummondii, herbaceum, pumilum, Suks- 

 dorfii, ramosum and Texanum are ecological 

 forms likely to be found with the type. All are 

 described in Fern Bulletin Vol. XI. 



226. Equisetum hiemale intermedium A. A. Eaton. 



Common or abundant; in moist meadows. Mis- 

 sissippi Valley and westward to the Rocky 

 Mountains. Resembles E. laevigatutn. 



227. Equisetum hiemale robustum,(A. Br.) Great 



Scouring Rush. Very common; in the South- 

 ern States. Often regarded as a mere robust 

 form of the type. It may be noted that the cor- 

 rect name for this plant is hiemale prealtum 

 (Rat.). — Equisetum robustum A, Br. 



