Nort AMERICAN EQUISETUM 73 
Type locality: Southern California. 
In moist to dry sandy soil, especially along streams. 
Santa Barbara and Inyo counties, Cal. southward, 
probably into Mex. 
8. EQUISETUM FLUVIATILE L. Sp. PI. 1062. 1753. Water 
Horsetail. 
E. limosum lL. E. heleocharis Ehrh. FE. uliginosum 
Muhl. 
Type locality: “Habitat in Europa ad ripas lacuum, . 
fluviorum. ’ 
Usually in swamps and the margins of ponds and lakes 
in water up to two or more feet in depth. 
North temperate zone; Europe and Asia, through 
Alaska to Labrador and Newf., south in N. Am. to Ore., 
Wyo., Neb., Va., and Conn. 
9. EQUISETUM PALUSTRE L. Sp. Pl. 1061. 1753. Marsh 
Horsetail. 
Type locality: ‘‘Habitat in Europae aquosis.”’ 
In wet places. 
North temperate zone; Europe to Japan, Alaska, and 
Newf., south in N. Am. to Conn., N. J., Ill., Wyo., and 
San Mateo County, Cal. 
10. Equiserum sitvatTicum L. Sp. Pl. 1061. 1753. 
Wood Horsetail. 
Type locality: Oe i asin in Europae septentrionalis 
pratis sylvaticis.’ 
In moist sandy woods and thickets. 
Circumpolar, north temperate zone, extending be- 
yond the Arctic circle; Europe and northern Asia to 
Alaska, Labrador, and Greenland; in N. Am. south to 
Conn., N. Car., W. Va., Ohio, Iowa, 8. Dak., and Mont. 
11. Equtserum prRATENSE Ehrh. Hannov. Mag. 22: 138. 
1784. Meadow Horsetail. 
E. umbrosum Willd. E. triquetrum Bory. E. drum- 
mondii Hook. 
