HITCHCOCK — PLANTS OF AMES, IOWA. 50-> 



C. AIjTISSIMUS, L. Willd. Spec. iii. — Carduus altissimus, L. Spec. 

 Open woods and roadsides; abundant. 

 Var. DISCOLOR, Muhl.) Gray, Proc. Airier. Acad. xix. 1883.— 

 C. discolor. Muhl. in Willd. Spec. iii. 

 Borders of fields, along fences, etc. ; common. 



Seems to pass into C. altissimus. The white-flowered form occurs along Skunk 

 river. 



C. odoratus, Muhl. Cat. 1st ed.— Carduus odoratus, Muhl. Cat. 2d 

 ed. — C. fumilus. Torr. Compend. 1S26. 

 Pastures: not uncommon. 



[Of this, Mr. Watson writes : — The Cnicus sent is not true C. pumilus. While 

 the foliage and shape of the involucral scales agree well enough, the latter have c 

 black, glutinous thickening above, which I do not find on eastern specimens. Of 

 more importance are the more acuminate anthers, like those of the other western spe- 

 cies of the group. It will not go into C. Drummondii, and I suspect that it is a 

 fairly good undescribed species. — T.] 



C. arvensis, (L.) Hofim. Fl. Germ. iv. 1804.— JSerratula arvensis, 



L. Spec. 



Introduced in a few places but not established. 

 HlERACIUM SCABBUM, Michx. Fl. 



Upland woods: a few specimens collected on Onion creek, north- 

 west of stone arch, in 1SS6. 

 H. longipllum, Torr. in Hook. Fl. i. (note under II Scouleri). 

 Prairie : infrequent. 



Campus south of Prof. touse ; abundant a few r :" the veter- 



inary barn. 



Pbenantjies racemosa, Michx. Fl. 



Low prairie; not uncommon. 

 P. aspera, Michx. Fl. 



Prairie: infrequent. 

 P. alba, L. Spec. 



Upland woods; frequent. 

 Troximon cuspidatum, Pursh, Fl. 



Prairie; scarce. 



Alon-_' n.ilroad 3 miles east of Ames, and elsev. 



Taraxacum officinale, (With.) Weber in Prim. Fl. Holsat. 1780. 



— Leontodon officinale. With. Bot. Arrang. 1776. 

 Grassland; common. 

 "Ca Scariola, L. Spec. 2d ed. 

 ^'aste places; becoming frequent. 



first described under L. Serriola A . . .*. ':. iv. p. 32-;, which is 

 probably a typographical error, for in the Species, 2d edition, the description is the 

 same as in the Amcenit lich reference is made without comment. 



L. Canadensis, L. Spec. 



Moist places; common. 

 L. Ludoviciana, (Nutt.) DC. Prod. vii. — Sonchus Ludovicii 



Nutt. Gen. 



