SYNGENESIA. ZQUALIS. 129 
A genus of 2 species indigenous to Europe. 
537. CYNARA. L. (Artichoke.) 
Calia dilated, imbricate, scales carnose, 
emarginate with a point. Receptacle setose. 
Pappus sessile, plumose. 
a Jarge, similar to those of eantina pst and 
Dy. = 
Species. 1. C. Scolymus. (Common Artichoke.) Begin- 
ning to be naturalized and proving a troublesome weed in 
some parts 6F Virginia—Indigenous to the south of Eu- 
“rope. 
538. CARDUUS. L. (Thistle.) 
 Calix ventricose, imbricate, scales “ing. 
Receptacle villous. Pappus pilose or plumose, 
_ deciduous, — 
_Leayes usually spiny, decurrent or sessile, Stigma 
early entire. Anthers bifid at the base, the segments 
ar toa glandular ring. i. 
‘Sprcres. 1, C. pectinatus. -. nated 
§ 1. Cxrevs. Pappus 
2. lanceolatus. Naturalized. 3. altiovimns: On the allu- 
vions of the Missouri, not far from St. Charles, } have ob- 
served this thistle 12 to 18 feet high. 4 arvensis. Not 
commonly naturalized. Abundant round Detroit. Thave 
never s¢en it in Pennsylvania. 5. muticus. 
6. *gluber. Leaves sessile, pinnatifid, every where 
smooth, segments spiny, acute, lower ones subdecurrent; 
calix ovate, glabrous, ngples spineless, shortly and seta- 
cd ths -obt r carinate; stem much branch-— 
ed.~ oi ace, Jersey bei to €. muticus. Aors 
om ‘cher ana Stem earasels mostly tAcwcred: 
leaves sessile, lanceolate-linear, margin revolute, distantly 
boat inosely serrate, beneath tomentose, above very 
eee ; calix ovate, scales appressed, shortly mucronate, 
paid: carina giandulous. Has. In the forests of North 
_and South Carolina, common. Stem 3or 5 feet high, slen- 
po tar nearly into a solitary and almost naked 
flower purple, somewhat larger than that of C. 
"Leaves. s towards the base of the stem. 
re i 
e. 
