95 
SYNGENESIA, ^QUALIS. 
Common Thistle, 
This is the commonest species, being found every where 
on way-sides, among rubbish, and on commons. Flowers 
purple, very large. Probably introduced. Biennial. From 
June till autumn. 
£. C. leavei^ sessile, pimiatifitl, acute, incised, liorriduius. 
very spinous ; involucrum terminal, one-flower- 
ed, many-leaved ; folioles very spinousj calices 
u n armed. — Fursfi, 
C. horridulus, Pers, 
C. horridus, Muhl. 
C. piibescens, Gronovius. 
Serratula discolor, Lamark. 
Cirsium horridulum, Mich. 
Carduus spinosissimus, Walt. 
Yellow Thistle, 
From two to three feet high, very thorny, Flowers large, 
pale-yellow. Along the course of the Delaware, Jersey side, 
from Market Street ferry to Kaighn’s point ; rare. Peren- 
nial. July, September. 
3. C. stem tall, leafy, and divaricately branched ; iiiscoioiv 
leaves lanceolate, sessile or amplexicaule, more 
or less deeply pinnatifid, above smooth, beneath 
tomentose ; segments bilobed, partly ciliated and 
terminated by spines j calix subglobose ; scales 
ovate, spiny. — JVutt. 
C. discolor, Muhl. 
This common species is surprisingly omitted by Pursh. It 
is abundant in Maryland and Pennsylvania. From three to five 
feet high, very much branched. Leaves always pinnatifid. 
Flowers purple. On road-sides and in woods of Jersey, and 
in similar places near this city ; near Hamilton and Mantua 
villages; common. Perennial. July, September. 
4. C. stem retrorsely pilose, 1 to S-flowered ; odoratus. 
leaves of the same colour on both sides, amplexi- 
caule, oblong-lanceolate and pinnatifid ; seg- 
ments irregularly lobed, ciliated and terminated 
with spines 5 calix large and partly globose. 
