1482 CARDUACEAE 
rather weakly spine-armed: outer bracts of 
the involuere obtuse or euspidate, the inner 
ones narrowly linear, short-acuminate, 27—29 
. long: corollas lilae, mos E 2 -30 mm 
en —(SWAMP-THISTL Ee —Swamps, mead- 
ian ‘fields, and roadsides, various provinces, 
Fla. to Tex. Sask., and Newf.—Sum.-fall. 
2. O. arvense (L.) Scop. Stems 2-10 dm. 
all glabrous or nearly so: ned 
| : ts of in- 
voluere acute, - e inner ones mm, pe 
short-acumina 9—12 long: corollas 
lilae to rosy- Aad or white, mostly 12-15 mm. lon g:— (Canapa: -THISTLE. )— 
Fields, pastures, waste- placos, and roadsides, various provi , N. C. to Kans., 
B. C., and Newf.—Sum.—Nat. of Eu.—Plants are a e dioecious. 
C. repandum Michx. Stem 1.5-5 dm. tall webby-lanate: leaf-blades 
spatulate to narrowly elliptic or broadly linear, pinnately many-lobed and 
copiously spiny: outer bracts of the involucre long-acumina te, the inner ones 
with curled tips: corollas rosy-purple.—Pinelands and sand-hills, Coastal Plain, 
Fla. to N. C.—Sum. | 
4. C. LeContei T. & G. Stem 6-11 dm. tall, floccose- -woolly: leaf- blades 
oblanceolate to lanceolate, pinnatifid and relatively sparingly spiny: outer 
bracts of the involucre short-acuminate, the inner ones with erect tips: corollas 
rosy-purple.—Low pinelands, Coastal Plain, Fla. to La. and N. C.—Sum.-fall. 
odoratum (Muhl.) Petrak. Stem 3-10 dm. tall, tomentulose: leaf- 
blades oblaneeolate, 1 or 2-pinnatifid: outer braets of the involuere lanceolate, 
Ld -tipped, the inner bracts 25-35 mm. long: corollas E 40-50 
long.— (PASTURE-THISTLE. )—Pastures, fields, and low unds, vario 
om N of Coastal Plain, N. C. to Pa. and Me. uo fall. 
C. virginianum (L.) Michx. Stem 5-11 dm. tall, e leaf-blades 
linear to linear-elliptic, or spatulate at ps base of the stem, spiny-toothed: 
outer ies of the alginate with slender tips nearly as ae as the body, the 
inner bracts 12-14 mm. long: ars lilae to rosy- Purple, E 19 mm. long.— 
Woods d thiekets, Fla. to Miss. Ky., and Va.—Spr.- 
C. revolutum Small. Stem 5-20 dm. tall, floccose: leaves rigid; blades 
thick, revolute, rigidly spine-armed, densely white-woolly or bir ip e 
outer braets of the involuere short-tipped, the inner braets 12—20 long, 
narrowly linear: corollas lilac to rosy- Purple, 20—25 mm. long bay Picea 
Coastal Plain, Fla. to N. C—Sum.—fal 
8. C. flaccidum Small. Stem 7-16 dm. tall, floccose: leaves pliable; ici 
thin, flat, weakly spine-armed, thinly gray ^to mentose- ipe) beneath: ou 
braets of the involucre with slender tips nearly as long as nore the inner 
bracts long-tipped, 12—16 mm. long: corollas lilac to oe ae 19-21 mn 
long.—Woods and banks, Coastal Plain and adj. provinces, Ga. to Tex. au 
Mo.—Late spr.-sum. 
