APPENDIX 163 



Cliickwced, Large Mouse-ear. Cerastiuni vulgatuin. 



Cinquefoil, Rough. Potentilla monspeliensis. Ionia ; 

 Charles City. 



Clammy Weed. Poiauisia graveolens. Clear Lake. 



Coneflower, Gray-headed. Lepachys pinnata. Mason 

 City. 



Coneflower, Sweet. Rudbeckia snbtomentosa. Charles 

 City; Grinnell. 



Coneflower, Tall. Rudbeckia laciniata. Mason City; 

 Charles City. 



Coneflower, Thin-leaved. Rudbeckia triloba. Charles 

 City; near Des Moines. 



Cucumber, One-seeded Bur. Sicyos angulatus. Du- 

 buque. 



Cudweed, Lobed. Artemesia ludoviciana. 



Culver 's Root. Veronica virginica. McGregor. 



Cup-plant. Silphium perfoliatum. 



Evening Primrose, Common. Oenothera biennis. 



False Dragonhead. Physostegia virginiana. Mason 

 City; Charles City; Waterloo. 



Flat Top. Vernonia noveboraeensis. Grinnell. ^ 



Four-o'clock, Wild. Oxybaphus. Clear Lake. 



Galinsoga. Galinsoga pai^iflora. Dubuque. 



Gentian, Prairie. Gentiana puberula. Mason City. 



Gentian, Yellowish. G. flavida. Charles City. 



I have found G. crinita and G. affinis early in Sep- 

 tember in Minnesota. A friend has sent G. procera 

 from southern Wisconsin late in September. 



Gerardia, Slender. Gerardia tenuifolia. Charles City; 

 Grinnell. 



I have found G. grandiflora in splendid bloom at 



