COMPCOTJE. 7 " 



tapering into a petiole, serrate. Heads in short racemes in the 

 upper axils, the whole forming an interrupted spike or compound 

 raceme. Ray -florets whitish. The variety COn'color has yellow 

 rays. Dry banks and thickets. 



3. S. latifo'lia, L. Stem smooth, not angled, zigzag, 1-3 feet 

 high. Leaves broadly ovate or oval, strongly and sharply serrate, 

 pointed at both ends. Heads in very short axillary clusters. 

 Cool woods. 



4. S. CSe'sia, L., var. axilla'ris, Gray. Stem smooth, angled, 

 glaucous, slender, usually branching above. Leaves smooth, 

 lanceolate, pointed, serrate, sessile. Heads in very short clusters 

 in the axils of the leaves. Rich woods and hillsides. 



* * Racemes terminal, erect, loosely thyrsoid, not one-sided. Leaves 

 feather-veined. 



5. S. Virga-aurea, L., var. hu'milis, Gray. (S. humUis, 



Pursh, in Macoun's Catalogue.) Stem low, 3-6 inches high, 

 usually smooth ; the heads, peduncles, etc., mostly glutinous. 

 Leaves lanceolate or oblanceolate, serrate or entire, the radical 

 ones petiolate, obtuse, and serrate at the apex. Rocky banks ; 

 not common. 



* * * Heads in a compound corymb terminating the simple stem, not at all 

 racemose. 



6. S. Ohioen'sis, Riddell. Very smooth throughout. Stem 

 slender, reddish, leafy. Radical leaves very long (often a foot), 

 slightly serrate towards the apex, tapering into long margined 

 petioles; stem-leaves oblong-lanceolate, entire, sessile. Wet 

 grassy shores of Red Bay, Lake Huron. 



* * * * Heads in one-sided racemes, spreading or recurved. 



7. S. argu'ta, Ait. (S. juncea, Ait., in Macoun's Catalogue.) 

 Whole plant smooth, 1-4 feet high, rigid, branching above. 

 Lower leaves oval or elliptical -lanceolate, serrate with spreading 

 teeth, pointed, tapering into winged and ciliate petioles ; upper 

 ones lanceolate. Racemes very dense, naked, at length elongated 

 and recurved. The variety juncea has narrower and less serrate 

 leaves. Woods and banks. 



S. S. Muhlenber'gii, Torr. and Gr. (S. arguta, Ait., in Ma- 

 coun's Catalogue.) Stem smooth, angled or furrowed. Leaves 



