388 TRELEASE 



COOLEY, 246. FLETT, Fern Bull. 9 : 32. GILBERT, 8. HOOKER & 

 ARNOTT, 132. KAULFUSS, 2,279. KURTZ, 429. LEDEBOUR, 4 : 487. 

 J. MACOUN, 249. J. M. MACOUN, 575. MAXON, 640 ; List 645. 



MlLDE, Fil. 217. OSTENFELD, II. ROTHROCK, 459. TURNER, 8l. 



E. boreale BONGARD, 174. 



Farragut Bay (Trelease, 2615) ; Wrangell (Coville & Kearney, 422 ; 

 Evans, 72 ; Trelease, 2614) ; Taku Harbor (Saimders, 2773) ; Douglas 

 Island (Trelease, 2616) ; Juneau (Coville & Kearney, 550) ; Chilkat 

 region; Glacier Bay (Coville & Kearney, 728 with short recurved 

 branches ; Trelease, 2617, 2628) ; Sitka (Trelease, 2620) ; Virgin Bay 

 (Trelease, 2623, 2634) ; Orca (Trelease, 2622, 2635) ; Disenchant- 

 ment Bay (Brewer & Coe, 638; Trelease, 2621, 2630); Kadiak 

 (Brewer & Coe, 688; Cole; Coville & Kearney, 2291, 2370 toward 

 nemorosum; Evans, 390; Trelease, 2618, 2619, 2629) ; Cook Inlet to 

 Tanana River (Glenn in 1899) ; Kussilof (Evans, 6io<z) ; Fort Yukon 

 (Schrader) ; " Camp 29 " (Schrader) ; Gens de Large and Koyukuk 

 Rivers (Schrader in 1899) ; Echeatnu River (Herron in 1899) ; Popof 

 Island (Harrington in 1872; Saunders, 2625); Unalaska (Coville & 

 Kearney, 1729; Evermann, 127; Trelease, 2626) ; Akun (Townsend 

 in 1893) ; Adak (Townsend in 1893) ; Amaknak (Evermann, 162) ; 

 Attu (Jacobs in 1894); Cape Nome; Bering Sea: St. Paul Island 

 (Coville & Kearney, 1839; Kincaid, 107; Townsend in 1893; Tre- 

 lease, 2639) ; St. George Island. Also in the Yukon Valley : Inger- 

 soll Islands (Gorman, 989) ; Forty Mile Creek (Funston, 45). 



This is the most abundant Equisetum of Alaska, varying extremely 

 according to exposure, soil, latitude, and altitude, and to my eye 

 represents the prototype of all of the other Alaskan forms of E. 

 arvense, though Mr. Eaton finds that the latter are readily arranged 

 under European varieties derived directly from the type. 



46. Equisetum arvense campestre (Schultz) Milde. 



Popof Island (Harrington in 1872) . Not before reported as Alaskan. 



47. Equisetum arvense decumbens Meyer. 



Wrangell (Coville & Kearney, 4220; Trelease, 26140) ; Juneau 

 (Trelease, 2610) ; Glacier Bay (Kincaid, 104) ; Yakutat (Trelease, 

 2612); Kadiak (Trelease, 2611); Reindeer Station, Port Clarence 

 (Walpole, 1942) ; Bering Sea : St. Paul Island (Trelease, 2638) ; St. 

 Matthew Island (Coville & Kearney, 2119; Trelease, 2613). 



48. Equisetum arvense diffusum A. A. Eaton. 

 GILBERT, 8, 25. 



Kuzitrin River near Port Clarence (Walpole, 1638) ; St. Paul 

 Island, Bering Sea (Kincaid, 100). 



