130 SYNGENESIA. iE^^UALIS. 



8. discolor. Muhl. and AVilld. sp. pi. Stem tall, leafy, 

 and divaricately branched; leaves lunceolale, sessile or am- 

 plexicaule, more or less .deeply pinr.atifid, above smooth, 

 beneath tomentose, segments bilobed, partly ciliated and 

 terminated by spines; calix subglobose, scales ovate si)iny. 

 Hab. Common in Pennsylvania and Nev/ Jersey, usually 

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

 6 feet high, scarcely pubescent, considerably branched, 

 branches rather slender. Leaves variable, always pinna- 

 tifid, smooth above, ofien partly pseudopinnate or divided 

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

 verging by pairs are extremely spiny and ensiform; in 

 others the segments are shortly bilobed and slenderly 

 spiny. Calix not commonly large, subglobose, and rather 

 smooth, naked, or sometimes partly involucrate, the scales 

 appressed and terminated by long and slender spines; flo- 

 rets reddish-purple. Fl. July to September. Tills spe- 

 cies appears to be allied to C amaroides of Crete, judging, 

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

 haps at the same time very disiiuct. 



9. * pumilus. Stem lov.' and retrorsely pilose, 1 to 3- 

 flowered; leaves of the same colour on both sides, amplex- 

 icaule, oblong-lanceolate and pinnatifid, segments irregu- 

 larly lobed, ciliated and terminated with spines; calix 

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

 late, acuminate, spiny. C. odoratus. Muhl. Catal. Hab. 

 In the sandy fields of New Jei'sey, and in the vicinity of 

 New York. Obs. Leaves large, the lowest 12 inches long, 

 the mid-rib beneath densely pilose. Stem 1 to 2 feet high, 

 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, 1-fluwered. 

 Collected by W. Stuve, M.4J. on the banks of the Hudson, 

 in the vicinity of the city of New York. 



10. hoirinulus. llather low and branched; each calix 

 enveloped hy an mvolucrum, scales merely acute; flowers 

 ochroleucous. 



11. * undidatus. Stem low and few-flowered; leaves am- 

 plexicaule, piiuiatifidly sinuate, and plicately undulated, 

 on both sides tomentose, but beneath white, lobes bifid and. 

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

 cronate. Hab. 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 

 slendei'ly tomentose on the upper side; stem often 1, 2, 

 or few-flowered, and 1 to 2 feet high. Flowers large, red- 

 dish-purple. 



