130 SYKGENKSIA. ^<^UA1IS. 



8. (Uscolor. Miilil. and Wilid. sp. p!. Stem tall, leafy, 

 and divarlcuiely branched; leaves lanceolate, sessile o;- a.:i- 

 plexicaule, moi'e or less deeply pinnatifid, above smootij, 

 beneath tomentose, segments bilobcd, partly ciliated and 

 terminated by spines; caljx subg-lobose, scales ovale s!>iny. 

 Hab. Common in Pennsylvania and New Jersey, usually 

 on the bushy margins of open swamps. Obs. iitem 3 to 

 6 fett high, scarcf ly pubescent, considerably branched, 

 branches rather slender. Leaves variable, always pinna- 

 tifid, sm.ooth above, oiien partly pseudopinnate or divided 

 almost down to the mid-rib, in this case, the segments di- 

 verging by pairs are extremely spiny and ensifurm; ia 

 others the segments are shortly bilobed and slendeily 

 spiny. Calix not commonly large, subglobose, and rather 

 smooth, naked, or sometimes paril}involucraie, the scales 



^ appressed and terminated by long and slender spines; flo- 

 rets reddish-purple. Fl. July to September. I'liis spe- 

 cies appears to be allied to C. 'cynavoides of Crete, judging, 

 however, merely from an ambiguous definition, it is per - 

 haps at the same time very distinct. 



9. * pumilus. Stem low iJid retrorsely pilose, 1 to 3- 

 fiowered; leaves of the same colour on both sides, amiplex- 

 icaule, oblong-lanceolate and pinnatifid, segments irregu- 

 larly lobed, ciliated and terminated with spines; calix 

 large and partly globose, naked, scales appressed, lanceo- 

 late, acun)inate, spiny. C odoratus. Muhl. Gatat. Hab. 

 In the sandy fields of New Jersey, and in the vicinity of 

 Nev/ York. Obs. Leaves large, the lowest l2 inches long, 

 theinid-rib beneath densely pilose. Stem 1 to 2 feethigl), 

 erect or subdecumbent. Flowers reddish-purple, larger 

 than those of any other North American thistle, and not 

 inelegant. Pappus near 15 lines long. ^. Histrix. Leaves 

 densely margined with spines; stem simple, l-fiirvvered. 

 Collected by W. Stuve, ^L t). un the banks of the Hudson, 

 in tlie vicinity of the city of New York. 



10. hovridnias. Rather low and branched; each calix 

 enveloped by an involucrum, scales merely acute; flowers 

 ochroleucous. 



IL * unduuitus. Stem low and few-flowered; leaves am- 

 plexicaule, piimatifidly sinuate, and plicately undulated, 

 on both sides tomentose, but beneath white, lobes bifid arid 

 spiny; calix subglobose, scales lanceolate, erect, and mu- 

 cronate. Uab. On the calcareous islands of lake Huron, 

 and on the plains of Upper Louisiana. — Leaves almost like 

 some species of Cynara, but not remarkably large, more 

 slenderly tomentose on the upjjer side; stem often 1, 2, 

 or fev/-fiowered, and I to 2 feet high. Flowers large, red- 

 dish-purple. 



