116 AGRICULTURAL COLLEGE. |No. 17. 



ASCLEPIADACEiE. 



Milkweed or Silk- Asclepias Cornuti, Decaisne. 



weed - Ames; Indianola ; Charles City ; Burlington. 



Purple Milkweed. Asclepias purpurascens, L. 



Ames. 



swamp Milkweed. Asclepias incarnata, L. 



Ames ; Grinnell. 



Asclepias obtusifolia, Michx. 



Grinnell. 



Pleurisy-root. Asclepias tuberosa, L. 



Ames ; Indianola ; Grinnell ; Charles City ; Burlington. 



Whoried Milkweed Asclepias verticillata, L. 



Ames ; Burlington. 



Green Milkweed. Acerates viridiflora, Ell. 



Ames ; Charles City. 



OLE ACE M. 



White Ash. Fraxinus Americana. L. 



Ames ; Burlington. 



ARISTOLOCIIIACE^E. 



Wild Ginger. Asarum Canadense, L. 



Ames; Fayette; Burlington. 



CHENOPODIACEiE. 



Lamb's Quarters. Chenopodium album, L. 



Ames. 



var. Boscianum, Gr. 



Ames. Both common in gardens. 



Maple-leaved Goose- Chenopodium bybridum, L. 



foot. Ames. 



AMARANTACE.I-;. 



Pig-weed. Amarantus retroflexus, L. 



Ames. Several other species of Amarantus are found here, but 

 they have not yet been fully identified. All are weeds, the 

 most prominent of which is the common Tumble-weed (A. 

 albus, L. ?) 



