Ceniaurea. COMPOSIT.E. 405 



^ = Heads large, oblong or cylindraceous, conimonh- solitan- and pedunculate: involucral 

 bracts comparatively large, gradually acuminate into a mucronate cusp or weak and siiort 

 prickle, glabrate, the viscid di.r»al rid^'c narrow: cori.lla- purple: leaves wlien voung canes- 

 ccntly floccose-woolly beneath, oblong-liuear or narrowly lanceolate. 

 C. repandus, Ell. a foot or two high, leafy : leaves mostly nndulate-lobulate, rather 

 densely prickly at margins: head.s inch and a half long: involucre narrow-eampauulate.— 

 Sk. ii. 269 ; Gray, 1. c. Cirsium repandum, Michx. Fl. ii. 89 ; DC. Prodr. vi. 651. Cnrduus 

 rr-pandus, Pers. .Syu. ii. 386. C. Virginianus, Walt. Car. 195 'f — Dry pine Ijarreus, X. Caro- 

 lina to Florida. 



C. Lecontei, Gray, .'^tem slender but rigid, commonly simple and bearing a single con- 

 spieuou-ly pedunculate head (of full 2 inches in height) : "leaves spar.sely dentate or pinnatifld- 

 lobulate, with scattered prickles : involucre cylindraceous. — Proc. Am. Acad. x. 39. Cn:ras 

 Virginianus, Hook. Comp. Bot. Mag. i. 48. Cirsium Lecontei, Torr. & Gray, FL ii. 458. — 

 "Wet pine barrens, Georgia to Florida and Louisiana; first coll. by DConte' 



= ==== Heads inch and a half high, rather broad: involucre arachnoid-woolly; its principal 

 bracts broad and pointless. Atlantic species. 



m-C miiticus, Pchsh. Gbscurely arachnoid when young and with some villusity : stem 3 to 

 8 feet high, branching above : leaves deeply pinnatifid, sparsely weak-prickly, glabrate : in- 

 volucre sometimes glabrate in age: bracts with broad and short viscid ridge or spot just 

 beneath the obtuse or acutish sometimes mucronulate apex, lowest ovate or obkmg and verv 

 short, innermost linear : flowers rose-purple. — Gray, 1. c. C. glutinosus, Bigel. Fl. Bust. ed. 2, 

 291, not Lam. Carduus muticus and perhaps C. glaber, Xutt. Gen. ii. 129. Cirsium muti- 

 cum, Michx. Fl. ii. 89; DC. 1. c; Torr. & Gray, Fl. ii. 4.5*, excl. syn. of the var.?, which is 

 a more rigid form, growing in open ground. C. U'lielvni, DC. 1. c.^Low ground and 

 shady swamps, Newfoundland to Saskatchewan, I"lorida, and Louisiana. 



199. ONOPORDON, Vaill. Cotton Thistle. (Old Grr-ek name, mean- 

 in;; Asses' Thistle.) — Lai'L'e and .stovit biennials of tlie Old "O^orld. one sparingly 

 naturalized; fl. late summer. — DC. Prodr. vi. 617. OncyporJiim, L. 



» O. acAnthiusi, L. White with cottony wool: stem 3 to 9 feet high, branching, winged 

 throughout by decurrence of the large oblong sinuate-lobed and prickly leaves: wing's sinu- 

 ate, very prickly : heads pretty large : involucre globular, arachnoid or partly glabrate ; 

 bracts rigid, subulate and prickl}^ tipped, squarrose : corollas light purple or paler : pappus 

 fuscous, scabrous, not twice the length of the slightl}' rugose akene. — Fl. Dan. t. 909 ; Eugl. 

 Bot. t. 907. — Waste grounds near dwellings and roadsides in Atlantic States, not abundant. 

 (Xat. from Eu.) 



200. SlL YBUM, YaOl. :Milk Thistle. (liXv/3o^. ancient Greek name 

 of an edible-stemmed Thistle, perhaps the present plant.) — .Siniile species. 



S. IIakiAxum, G.t:etx. Prickly-leaved biennial or annual, glabrate or nearly glabrous ; with 

 ample sinuate or pinnatifid green leaves, blotched with white along the veins : curullas rose- 

 purple, deeplv cleft. — Escaped from gardens iu a few places, also a baHast^weed, disposed to 

 be naturalized southward, especially in California: fl. summer. (Adv. from Eu.) 



201. CENTAUREA, L. .Stak Thistle, &c. (Kevravpetoi', plant of the 

 Centaurs, name applied by the herbalists to two or three widely different genera.) 



An immense genus in the Old World, one species only indigenous to X. 



America two or three in Chili. — Centaurea & Carbenia (Adan.^. ), Benth. & 

 Hook. Gen. PI. ii. 477, 4.s2. 



§ 1. Cakbexia. Akenes terete, strongly many-striate, with lateral scar, the 

 corneous margin at summit 10-dentate : pappus double, each of 10 aristiform 

 bristles outer lono-er and naked, inner short and fimbriolate : anthers with elon- 

 gated cartUawinous terminal appendages, which are connate to their blunt tips : 



