(Nat. Ord. Compositae). Two species of this, A. artemisifolia and A. irifida (Sjm. A. integrifolia), are sometimes offered in catalogues as”choice plants with Aster-like flowers.”Both are subjects to be avoided, the latter specially so as it is the well-known Great Ragweed, a ubiquitous plant bearing coarse yellow flower heads most of the summer on plants 1-3 ft. high.

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Definition of  AMBROSIA