504 TRANS. ST. LOUIS ACAD. SCIENXE. 



A. arvensis, L. Spec. 



••Ames-Bessn-." Specimen in I. A. C. herbarium. 

 Achillea millefolium, L. Spec. 



Prairie; common. 

 Chrysanthemum Leucanthemum, L. Spec. 



Plants occur occasionally on the Campus, along the railroad, and elsewhere, but 

 the species has not, so far as I know, become established. 



Tanacetum vulgare, L. Spec. 



Escaped along roadsides in a few localities. 



Artemisia catjdata, Michx. Fl. 



Sandy soil; abundant along the sand-hills south of the Northwest 

 School. 

 A. DRACUNCULOIDES, Pursh, Fl. 



Prairie; not uncommon. 

 A. serrata, Nutt. Gen. 



Low ground: infrequent. 



Bottom-land in ''the forks" ; quite abundant on Clear creek about one mile west 

 of the College. 



A. Ludoviciana, Nutt. in Torr. & Gray, Fl. ii. p. 420. 



Prairie; common. 



Leaves incised, or entire (var. gnaphalodes) . 



A. biennis, Willd. Phytog. 1794. 



Dry and sterile ground; frequent. 



Beneoio aureus, L. Spec. 



Marshy places ; not uncommon. 

 Var. obovatus, (Muhl.) Torr. & Gray, Fl.ii. p. 442. -S, obova- 

 tus, Muhl. in Willd. Spec. iii. 

 Wet prairie; infrequent. 

 Var. balsa mite, (Muhl.) Torr. & Gray, 1. c. — &'. balsamitcB, 

 Muhl. 1. c. 



Rocky biuffs on Des Moines river at Boone. 



Cacalia tuberosa, Nutt. Gen. 



Wet prairie; frequent. 



Ebechtites hiebacipolia, (L.) Raf. in DC. Prod. vi. — Senecio 



hieracifolia. L. Spec. 



Moist place's ; not common. 



I 1 1 m [j w»i\\, L. Spec. 

 Neglected ground; common. 



PS lanceolatus, (L.) Hoffm. Fl. Germ. iv. 1804.— Carduus 

 lanceolatus, L. Spec. 

 Pastures; infrequent. 

 Rather abundant in a pasture about one mile northeast of Ames; also west of 

 the College beyond the brick-kiln. 



