64 FLORA OF WORCESTER COUNTY. 



Agropyrum, Gaertn. Wheat-Grass. 



repens, Beauv. Quitch-Grass. Common. 



Elymus, L. Wild Rye. 



Virginicus, L. Wet places. 



Canadensis, L. " " 



AsPRELLA, Willd. Bottle-brush Grass. 



Hystrix, Willd. Moist woodlands. 



Series II. CRYPTOGAMIA. 



Class III. ACROGEN^. 



Subclass I. PTERIDOPHYTA. 



EQUISETACE^. 



Equisetum, L. Horsetail. 



arvense, L. Common Horsetail. Gravelly soil, 



sylvaticum, L. Moist shaded places, 



limosum, L. In shallow water, 



hyemale, L. G. E. Stone. 



scirpoides, Michx. Southbridge. Z. E. Animidown. 



FILICES. 



PoLYPODiUM, L. Polypody. 



vulgare, L. Rocks, common. 



Adiantum, L. Maidenhair. 



pedatum, L. Rich moist woods. 



Pteris, L. Brake. 



aquilina, L. Common Brake. Thickets, common. 



AsPLENiUM, L. Spleenwort. 



Trichomanes, L. Rare. 



