50- TRANS. ST. LOUIS ACAD. SCIENCE. 



S11.PHIUM LACiNiATUM, L. Spec. 

 Prairie ; frequent. 



Radical leaves varying from narrowly oblanccokite and entire to bioadand twice 

 pinnately parted. 



S. INTEGRIFOI.IUM, MicllX. 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.— J.. 

 integrifolia, Muhl. in Willd. Spec. iv. 

 A form with entire leaves. 

 A. ARTEMISLE FOLIA, L. SpeC. 



Prairies and roadsides; common and quite variable. 

 A. PSILOSTACHYA, DC. Pfod. V. 

 Prairie; infrequent. 

 Dry hills north of College, beyond Squaw creek. 



Xanthium Canadense, Mill. Diet. 8th ed. 



Cultivated ground and waste places; common. 

 -V. Canadense, Mill., var. echinatum , (Murr. ) Gray, Syn. Fl. i. 2. — A', echhiatuin , 

 Murr. in Comm. Soc. reg. sci. Goett. vi. 17S3-4. If I have the right understanding o f 

 this variety, it does not occur in our flora. 



Heliopsis scabra, Dunal, Mem. Mus. Paris, v. 1819. 

 Prairie and open woods; common. 



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



Echinacea angustifolia, DC. Prod. v. 



Prairie; abundant. 

 Kudbeckia 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. & Clray, Fl. ii. p. 314. — Rud- 

 beckia pi?i?iata, Vent. Ilort. Gels. 1800. 



Prairie ; abundant. 



Helianthus annuus, L. Spec. 

 Waste grounds ; infrequent. 



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

 few inches high with a single small head. 



