﻿COMPOSIT.i!. 



§ 2. Scales of the ovoid- prlobose involucre appendiculate ; the appendages cili- 



ish: ray-floicers often none: papput wanting or nearly so! {corolla pur- 

 plish or rarely lohite). — Jacea, Cass. 



cauline sessile, \anceolate, entire, denticulat^ or sparingly angulate-incised 

 towards the base, scabrous; flowers all equal^nd^ perfect; pappus _niudi 



Bor.-A?n. 1. p. 301; DC! prodr. 6. p. blltBige'l.! fl. Bast. ed. 2. 



Newfoundland! (perhaps indigenous.) Naturalized in the easteru parts 



§3. Scales of the ovoi 



double, often short : heads not bracteate.—CxAuvs, Cass. 



3. C. Cyanus {Linn.) : floccose-tomentose ; stem erect, branching ; leaves 

 linear, sessile, entire ; the lower broader, tapering into a kind of petiole, and 

 toothed or pinnatifid at the base; pappus shorter than the achenium. 

 DC. prodr. 6. p. 578 Darlingt. fl. Cest. p. 435. 



Old fields and roadsides, having escaped from gardens ; sparingly natural- 

 ized in the Northern and Middle States. July-Aug.— ® Flowers blue 

 (varying to purplish or white), or those of the disk violet.— jB^mc Bottle. 



§ 4. Scales of the ovoid involucre coriaceous, imbricated ; the middle ones 

 ovate, and produced into a long spine, which is naked above but sparingly 

 pectinale-spinulose at its base ; the inner oblong and with a simple spine ; 

 the outermost spineless: rays 3-o-cleft, shorter than the disk: pappus 



nivent {corolla ^/eZZou^).— Mesocentron, DC. 



parted, tapering into a petiole ; the cauline decurrent, broadly linear, ^^^^^^ 



involucre ac^u'minate-^inescent. DC. / ^oS?*5.'^?. 593 ; Hook. &f jj^y 

 hot. Beechey, suppl. p. 360. C. Partibilcensis, DC L c, fide Hook. 



California, Douglas ! Probably introduced (as also into South America) 

 § 5. Involucre ovoid ; the middle scales produced into a spine, which is pin-^ 



equalling or exceeding the disk: pappus short or none {corolla purple)-— 

 Calcitrapa, Cass. 



5.^C. Calcitrapa (Linn.): stem diffusely much branched, hairy ; l^J^J 

 ing, g^rLved above, with 2 or S^small ^fnula on Vih°side at the base; the 



