5° 2 TRANS. ST. LOUIS ACAD. SCIENCE. 



SlLPHIUM LACINIATUM, L. Spec. 

 Prairie; frequent. 



Radical leaves varying iVoni narrowly oblanceolate and entire to bioadand twice 

 pinnately parted, 



S. INTEGRIFOLIUM, Michx. Fl. 



Open upland woods; frequent in the woods west of Nevada. 

 Leaves sometimes narrowed to a sessile base. 



S. perfoliatum, L. Spec. 2d ed. 



Moist soil; frequent. 



Ambrosia trifida, L. Spec. 



Low ground; common. 

 Var. integrifolia, (Muhl.) Torr. & Gray, Fl. ii. p. 290.— A. 

 integrifolia, Muhl. in Willd. Spec. iv. 

 A form with entire leaves. 

 A. artemisi-efolia, L. Spec. 



Prairies and roadsides; common and quite variable. 

 A. psilostachya, DC. Prod. V. 

 Prairie; infrequent. 



Dry hills north of College, beyond Squaw creek. 



Xanthium Canaden.se, Mill. Diet. 8th ed. 



Cultivated ground and waste places; common. 

 X. Canadense, Mill., var. ecliinatum, (Murr.)Gray, Syn. Fl. i. a.— X.echinatum, 



Murr. in Comm, Soc. reg\ sci. Goett. vi. 1783-4. It" 1 have the right understanding of 

 this variety, it does not occur in our flora. 



Heliopsis scarra, Dunal ; Mem. Mus. Paris, v. 1819. 

 Prairie and open woods; common. 



It has the appearance of Helianthus, but the ray-flowers are fertile. 



Echinacea angustifolia, DC. Prod. v. 



Prairie; abundant. 

 Rudbeckia laciniata, L. Spec. 



Low woods ; common. 

 R. triloba, L. Spec. 



Moist woods ; common. 

 R. SUBTOMENTOSA, Pursh, Fl. 



Moist prairie or open woods ; frequent. 

 R. hirta, L. Spec. 



Prairie ; common. 

 LEPACHYS PINNATA, (Vent.) Torr. & Gray, Fl. ii. p. 314. — Rud- 

 beckia pinnata, Vent. Hort. Cels. iSoo. 



Prairie; abundant. 



Helianthus anntjus, L. Spec. 



Waste grounds; infrequent. 



Ordinarily tall and stout, but ours is frequently depauperate, sometimes only a 

 few inches high with a single small head. 



