468 Obdbb to.— composite. 



6 C. altissimum Spreng. Tall, branched, villous-puboscent, leafy to the top ; hia. 

 whitish beneath, spinoua-ciliate, sessile, lanceolate oblong, often sinuate-dentate, Unoer 

 vmdivided or pinnatifid petiolate, lobes or teeth spinescent. Hds. large, scales 

 ovate-lanceolate, outer one with a spreading spine at apex. — Fields and barrens, 

 Penn. and W. States, common. St. 3 to 8f high, Lvs. 6 to 8', by 1 to 6'. Hds. 

 about 1' diam., with linear-lanceolate bracts at base. Fl. purple or purplish 

 ■white. Aug. i 



7 C. Virginianum Miohx. Slender, mostly simple, and naked above; lvs. 

 sessile, lanceolate, margin reoolute, entire or repaud-dentate, teeth spinescent, or 

 sometimes remotely sinuate-lobed or pinnatifid, upper surface glabrous, under 

 surface tomentous-canescent ; hds.smaU; inwi. subglobous; scales tipped with a 

 short, spreading prickle. — Woods, Ohio, and S. States. Plant about the size of the 

 Canada thistle, clothed with an arachnoid pubescence, with few or many heads 

 (sometimes but one) which are about i' diam. Flowers purple. Apr. — Sept; 

 (Carduus, L. Cnicus, Ph.) 



8 C repandum Mx. Arachnoid when young ; lvs. crowded to the top, at length 

 green both sides, clasping oblong-linea/r, undulate, spinous- ciliaie ; lids. \ or 2; 

 scales, outer ovate-lanceolate, inner subulate-acuminate. — Barrens, N. Car. to Ga. 



9 C pumilum Spreng. Hairy ; lvs. few above, green on both sides, clasping, 

 ollong-lanceolaXe, pinnatifid, the segm. irregularly lobed, cUiate, spinous; hds. few, 

 very large, subtended byl to 5 bracts ; invol. round-ovate, spinous. — ® A common, 

 low, turgid thistle, in roadsides, pastures, N. Bng. and Mid. States. St. 1 to 2f 

 high, stout, striate, with 1 to 3 very large head.s of fragrant, purple flis. Aug. 

 (Cnicus odoratus Muhl.) 



10 C. miitictim Mx. Lvs. pinnatifid with divaricate segments ; hds. on 

 naked peduncles without bracts; invoL ovoid with unarmed, villous-arachnoid, 

 glutinous scales. — @ A fine looking thistle found in damp soils. Can. and TJ. S. 

 St. branching, 3 to 7f high. Lvs. armed with spines at each angle. Hds. 1' diam., 

 with deep purple corollas, the scales webbed and glutinous on the back. Aug., 

 Sept. 



11 C- glaber Nutt. Tall, slender, nearly glabrous; lvs. lance-linear, rigid, with 

 spinescent, divaricate segments, the lower slightly decurrent ; hds. naked, on leafless 

 stalks; sciiks setaceov^ly inucronate, strongly keeled, almost glabrous, the inner 

 atteiiuatu-acuminate. — N. Jor. to Ga. St very smooth, angled, 3 to 5f high. Lvs. 

 minutely araclmoid beneath. Hds. 6" diam., truncate at base. Pis. purple. Jl. 

 Sept. 



12 C. arvense Scop. Canada Thistle, Cuksed Thistle. Lvs. sessile, sinuate- 

 pinnatifld, wavy, spinous; St. panicled; hds. numerous, small invol round or 

 ovate, unth minute spines, scales close-pressed, ovate-lanceolate. — If Common in 

 fields, road,sides"-and waste places, N. Eng. to W. States, very troublesome to the 

 farmer. Root creeping, long and tenacious of life. St. 3f high, with a branching 

 panicle at top. Hds. small (4 to 5" diam.) purple, the involucre neaily Ihornlesa, 

 and is the only part of the plant that can be safely handled. Jl. § Eur. 



97. LAP'PA, Tourn. Burdock. (Lat. fo^a, a burr, from Gr. /'ta|3£tJ', 

 to lay ])ol(l of; a characteristic term.) Heads discoid, homogamous; invo- 

 lucre globons, the scales imbricated and hooked at the extremity ; re- 

 ceptacle bristly ; pappus bristly, scabrous, caducous. — © Coarse, Euro- 

 pean herbs. Lvs. alternate, large. 



Jl. major Gaert. Lvs. cordate, unarmed, petioled. — Common in waste and culti- 

 vated groundsf fields. N. Eng., Mid. and "W. States. Each plant is a large, coni- 

 cal, ill-scented and coarse-looking mass of vegetation, surmounted by a branching, 

 irregular panicle of ovoid heads with tubular corollas of an exceedingly delicate 

 pink color. The leaves are very large, with wavy edges. It has a wonderful de- 

 sign for tlie dispersion of its seeds. The scales of the involucre all end in a mi- 

 nute, firm hook, which seizes hold of everything that passes by. Ji, Aug. § Eui. 

 (Arctium Lappa L.) 

 /?. Leaves pinnatifid.— -Pcnn. (Darlington). 



