Artificial key to the weed seeds found in commercial seeds in Illinois and adjoining states . Plate HIRow l. Erigeron 2. Cichorium 3. Ambrosia art ami si if o iia • Plate 17 Bow 1. Silene antirrhina. Ro- ?. Stellaria media. Row 3. Anthemis Cotula. Row 4. Lactuca gcariola. Row 5. Salsoli Kali. Row 6. Cir3ium lanceolatum. Plate HI. Plate IV I 1 MM m # <+ & # •f «

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