26 
very slender, numerous, tufted and entangled, three or four fur- 
rowed, with as many bristle-tipped teeth ; spikes very small. Wet 
clayey banks in the shade of hemlocks. Norfolk and Plainfield, 
Conn. Green river road, Greenfield, Mass., A. T. Beals. South- 
bridge, L. E. Ammidown Amesbury, A. A. Eaton. Frequent in 
the three northern states. Early May. Northern and Arctic re- 
gions of both hemispheres. 
LITERATURE. 
Figures, with full dissections of all the known species in the 
genus Equisetum are contained in Milde’s elaborate “ Monograhia 
Equisetorum,” and an abtract in his “Filices Europmse,” both writ- 
ten in the Latin language. All the species in our limits, except 
E. scirpo ides and E. litorale are illustrated in Hooker’s “British 
Ferns,” “ English Botany,” and Newman’s “ History of British 
Ferns,” and all except E. variegation, E. litorale and E. scirpoides 
are figured in Anne Pratt’s ‘Flowering Plants and Ferns of Great 
Britain. ” Buysson’s ‘ ‘Filicinise de Europe” (French) contains much 
of interest relating to the Equisetacese. 
