.200 COMPOSIT.E. 



Wet shady woods. Arct. Amer. to Louis. W. to Oregon. June, July. %.--> 

 Stem 1 — 2 feet high, branched above, often woolly. Heads middle sized, nume- 

 rous, on long slender peduncles which are thickened near the involucre ; rays 

 8—12, and with the disk yellow. Golden Groundsel, i^quuw-weed. 



3. /S, Balsamitcc Muhl. : stem erect, villous at base ; radical leaves ob- 

 long-lanceolate, dentate-serrate, on long petioles ; cauline lyrate-pinnatifid, 

 sessile, the segments toothed ; heads into compound umbellate corymb. 



Moist grounds. Arct. Amer. to Louis. W. to Oregon. June, July. %. — 

 Sle7n 1 — 2 feet high, densely woolly at the base. Heads rather small, yellow ; 

 rays 8 — 12, narrow ; disk flowers about 20. Bahamita-like Groundsel. 



4. 5". obovatus Muhl. : stem erect, smoothish -, radical leaves varying from 

 roundish-ob ovate to oblong-spatulate, crenate-serrate, petiolate ; cauline 

 pinnatifid, toothed, sessile ; heads in a nearly simple somewhat umbelled 

 corymb, on long peduncles which are scarcely thickened at the summit. 



Rocky woods. Arct. Amer. to Louis. W. to Oregon. June, July. %. — Stem 

 a foot high, branched at the summit. Heads rather small, yellow ; rays about 

 10. Torrey & 6ray consider this and the preceding species, as mere varieties 

 of S. aureus ; to which also they refer S. lanceolatus Oakes and S. gracilis 

 Pursk. Obovate-leaved Groundsel. 



5. S. tovientosus Mich.: white -tcftnentose and woolly; radical leaves 

 oval-oblong or oval-lanceolate, serrulate-crenate, toothed at base, on long 

 petioles ; cauline oblong, somewhat divided ; corymb small, somewhat um- 

 belled. S. integrifolius Null. Cineraria integrifolia and heterophylla 

 Pursk. 



Dry rocks on the Blue Moimtains, Penn. Pursh. S. to Flor. May, Juneu 

 %. — Stem 1 — 2 feet l::gh. Heads yellow, larger than ill S. aureus ; rays 12 — 15, 

 elongated. Lony Groundsel. 



6. S. elongatus Pursh. : smooth ; radical leaves spatulate, serrate, atten- 

 uated into a petiole ; cauline pinnatifid, toothed, very remote ; heads on 

 elongated peduncles, arranged in a somewhat umbelled corymb. 



Rocks on banks of streams near Easton, Penn. July, Aug. 71. — Resembles 

 S. BalsamitcB, but is destitute of ray flowers. Pursh. Elongated Chroundsd. 



V. Cynare^. Style in the ^perfect flowers thickened near the sum- 

 mit, and often fringed at the tumor ; its branches distinct or united, 

 pubescent externally. 



53. CENTAUREA. Linn.—Knsup Weed. Blue Bottle. 



(From the Centaur Chiron, who is said by this plant to have cured himself of 

 a wound received from Hercules.) 



Heads many-flowered ; ray flowers mostly large and sterile, 

 funnel-form, sometimes wanting. Scales of the involucre imbri- 

 cate, various. Receptacle bristly-paleaceous. Achenia com- 

 pressed. Pappus mostly in many series, pilose, sometimes 

 wanting. 



1 . C. Jacea Linn. : stem erect, branched ; leaves linear-lanceolate ; 

 lower broader and toothed, petioled ; scales of the involucre scarious and 

 torn, the outer pinnatifid ; heads radiate ; pappus very short or none. 



