74 AMERICAN FERN JOURNAL 
Type locality: “Bei Stiege, in Fuerstenthum Blanken- 
burg” “auf den Wiesen,”’ Germany. 
In sandy meadows, and alluvial soil. 
North temperate zone; British Isles, Europe, Siberia, 
and Alaska to Nova Scotia; in N. Am. south to Conn., 
N. J., Iowa, and Colo. 
12. EquiseTuM TELMATEIA Ehrh. Hannov. Mag. 287. 
1783. Ivory Horsetail. 
E. maximum Lam. E. majus Gars. 
Type locality: Europe. 
In various situations, especially in moist shady mar- 
gins of woods. Europe and western Asia, western North 
Africa, and in N. Am. from B. C. to southern Cal. 
13. EquisETUM ARVENSE L. Sp. Pl. 1061. 1753. Field 
Horsetail. 
FE. saxicola Suksd. E. boreale Bong. 
Type locality: “Habitat in Europae agris, pratis.” 
In various situations, especially in sandy soil and on 
railway embankments. 
Circumpolar, north temperate and Arctic zones, 
reaching beyond the 80th parallel of north latitude; 
Europe, Northern Asia to the Himalaya Mts. and Japan; 
north Africa, south Africa; in N. Am., Alaska to Green- 
land, south to S. C., northern Mex., and southern Cal. 
LITERATURE CONSIDERED IN THE PRELIMINARY 
DISCUSSION. 
1. Braun, ALEXANDER. A Monography of the North — 
American species of the genus Equisetum; translated 
from the author’s manuscript, and with some additions, 
by George Engelmann. Am. Jour. Sci. and Arts 46: 81- 
91. April, 1844. 
2. Eaton, A.A. A New Equisetum. Fern Bull. 10: 
120-122. 1902. 
3. Eaton, A.A. The Genus Equisetum in North 
America—xu. Fern Bull. 11: 7-12. 1903. 
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