Thickets, S. Muhlenbergii, T. & Gray. Edges of woods. S. linoides, Solander. Swamps. S. altissima, L. Along fences. S. ulmifolia, Muhl. Damp thickets. S. odora, Ait. I'eekskill. (Le Roy.) S. aemoralis, Ait. Fields and road-sides, common. S. Canadensis, L. Fields and road-sides. S. serotina, Ait. Damp grounds. S. gigantea, Ait. Along fences. S. lanccolata, L. Damp grounds. S. tenuifolia, Pursh. Rye. near the coast.

Inula, L. (Elecampane.)

Li. Helenium, L. Road-sides, near dwellings. (Nat. Eu.y

Pluchea, Cass.

P. camphorata, DC. Along the coast.

Baccharis, L. (Groundsel-Tree.) B. halimifolia, L. (Leggett.)

Iva, L. (Marsh Elder.)

L frutcscens, L. Salt meadows.

Ambrosia, Tourn. (Rag-weed.) A. trifida, L, Fields.

A. artmisisefolia, L. Said to be the plant whose pollen causes the disease called Hay Fever. In confirmation of this belief, the following statement was made to me by Rev. Dr. Samuel Lockwood, who is a sufferer. I give, as near as I can recollect, his own words : In a walk through the fields I came to a wheat stubble covered with a dense growth of Ambrosia, Artimisircfolia, in a state just ready to discharge its pollen. I hestitated, but finally concluded to cross ; at once I found great difficulty in breathing and when I reached the other side, I was completely prostrated and was obliged to sit for some time, and the experiment was followed by one of the most severe attacks of Hay Fever I have ever experienced.

Xanthium, Tourn. (Cocklebur.)

X. strumarium, L. Spyten Duyvil, (Leggett.)

Var. echinatum, Gray. Y. spinosum, L. Coast. (Nat. from the south.)