49$ TRANS. ST. LOL'IS ACAD. SCIENCE. 



L.ONICBRA GLAUCA, Hill, Hort. Kew, 1768. 



Rocky woods ; infrequent. 



Hoggatt's woods; Skunk river northeast of Ames. 



RUBIACEJE. 



Cephalanthus occidentaxis, L. Spec. 



Sloughs; infrequent. 



A low shrub, 3 to 4 fett high. (In eastern Iowa it grows taller— 6 to S It. high.) 



Galium Aparike, L. Spec. 



Low woods; abundant. 



Annual; stems reclining, often forming dense mats; leaves 6, or mostly S, linear 

 to oblanceolate; fruit hispidulous. 



G. trifidum, L. Spec. 



Wet places: common. 



A low diffusely-branched perennial: leaves linear, about \ inch lonjj, 4 to 6 in a 

 whorl; fruit smooth. A form with mostly 6 narrowly elliptical leaves, grows abun- 

 dantly in upland woods. 



Var. latifolium, Torr. Fl. U. B. 

 Wet places, common. 



Plant usually less branched; leaves broader. 



G. concinnum, Torr. & Gray, Fl. ii. p. 23. 



Dry hills : abundant. 



Resembles G. trifidum. but leaves all in sixes and flowers more numerous. 

 G. TRIFXORUM, MicliX. Fl. 

 Woods; frequent. 



Leaves elliptical-lanceolate, all in sixes, larger and broader than in the other 

 specis : fruit hispidulous. 



COMPOSITE. 



VERNONIA FASCICUIiATA, Michx. Fl. 



Bottomlands: common. 

 Eupatorium PURPUREUM, L. Spec. 

 Low woods: not uncommon. 

 Var. MACUiiATUM, (L.) Darl. Fl. Cest. 1837. — E. maculatum, L. 



Amoen. iv. 1760. — E. furfiureu?n. 3. L. Spec. 

 Sloughs and low woods; frequent. 

 This is more common than the type, and easily distinguished; the inflorescence 

 is denser, the leaves shorter, and veins more reticulated. 



F. ALTTSSIMUM, L. Spec. 



Dry banks; infrequent. 

 E. perforatum, L. Spec. 



Low grounds; common. 

 E. AGERATOIDES. L. f. BUppl. 1781. 



Woods: common. 

 Kuhnia EUPATORIOIDES, L. Spec. 2d ed. appx. 



Dry prairie; abundant. 

 Var. QLUTiNOSA, (Ell.) — K, glutinosa. Ell. Bk. ii. — K. cvpatori- 



oides, L.. var. corymbttlosa . Ton. & Gray, Fl. ii. 



Dry prairies ; abundant. 



