458 Order V«.— COMPOSITE 



chaffy ; achcnia without a pappus. — 21 European herbs with much di- 

 vided, alternate Ivs. Hds. radiate. 



1 A. Millefdlium L. Lvs. hipimatifid, with liaear, deatate, mucronate seg- 

 ments ; St. furrowed, oorymbed at top ; scales oblong ; rays 4 to 5, short. — Fields, 

 pastures, &o., ^. Eag. to Or. and Arctic America. St. a foot high . branching at 

 top into a dense, flat-topped corymb of white or rose-colored fls. It has an agree- 

 able, pungent taste and smell. Jn. — Sept. — The variety with rose-purple flowers 

 is very pretty in gardens. 



2 A. ptirmica L. Sneezewort. Lvs. linear, acuminate, oquaUy and sharply ser- 

 rate, smooth. — Found in moist grounds and shady places, Can. and N. T. (Pursh), 

 Mass. (Nichols). Plant about 15' high, branching -at top into a diffuse corymb of 

 white hs. The lvs. are remarkably distinct from the yarrow. The dried powder 

 of the leaves, used as snuff, provokes sneezing. A variety with double flowers 

 occurs which is quite ornamental in pots. Aug. \ § Bur. 



72. LEUCAK'THEMUffl, Tourn. White-weed. (Gr. Xevmg, white, 

 dvOoq, flower ; the heads have large, conspicuous rays.) Involucre 

 broad, depressed, imbricated ; rays pistillate, numerous ; receptacle flat, 

 naked ; achcnia striate ; pappus none. — Herbs with alternate lvs. Hds. 

 radiate. 



L. vulg^re Lam. Lv.s. amplexicaul, lanceolate, serrate, cut-pinnatifid at base; 

 St. erect, branching. — H The common white- weed is an annoyance to farmers, 

 rapidly overspreading pastures and neglected fields, TJ. S, to Arc. Am. Sts. 2f 

 high, simple, or with one or two long branches, furrowed. Lvs. comparatively few 

 and small, obtuse, the lower ones potiolato, with deep and irregular teeth, upper 

 ones .small, subulate, tjo ■ of the middle sessile, clasping, deeply cut at base, with 

 romoto teeth above. Hds. large, terminal, solitary : disk yellow ; rays numer- 

 ous, white. Jl. — Sept. (Chrysanthemum leucanthemum L.) § 



73. MATRICA^RIA, Tourn. Fever Few. Involucre scales imbricate, 

 miiny-flowored, with membranous margins ; receptacle conical or con- 

 vox, naked ; pappus a membranous margin crowning the achcnia, or 

 none. — Herbs chiefly perennial, with alternate lvs. Hds. with or with- 

 out rays. (Pyrethrum, Smith.) 



M.'parthdnium L. Hds. radiate; lvs. petiolate, flat, tripinuate, the segm. ovate, 



cut ; ped. branching, corymbous ; at. erect ; invol. hemispherical, pubescent 



Fields, rare. Several varieties of the Fever-few are cultivated, and are in great 

 favor with many florists, on account of theu" fine pyramidal form, surmounted 

 with a corymb of pure white, double flowers which retain their beauty for several 

 weeks, f Kur. 



2 M. discoidea DC. Hds. discoid; lvs. sessile, 2 to 3-pinnately parted, lobes 

 small, linear-oblong, acute; hds. on simple peduncles; scales equal, oval, obtuse, 

 with white, scarious margins much shorter than the conical disk. — (j) 111. opposite 

 St. Louis, also in Oregon. Sts. 3 to 8' high. Disk 2 to 3" broad and high. Pap- 

 pus obsolete. 



3 M. BalsamitaWilld. English Mint. Pubescent; hds, discoid; st. erect; 

 lvs. ovate, oblong, serrate, the lower petiolate, upper sessile, auriculate at base ; 

 hds. corymbed ; pappus none. — Gardens. St, 1 to 2f high. The plant is yellow- 

 ish green, clothed with loose, minute tomentum, with the fragrance of spearmint. 



74. CHRYSAN'THEMUM, (Gr. xpvoo^, gold, avOo<;, flower.) Heads 

 heterogamous ; involucre imbricate, hemispherical ; the scales with 

 membranous margins ; receptacle naked ; pappus none.— Ornamental 

 plants from China and other eastern countries. Lvs. alternate, lobed. 

 Hds. radiate. 



1 C. coron^ritunL. Annual; st. branched; lvs. hipinnatifid hroaisT &% Vci9 

 summit, acute. — Native of S. Europe and N". Africa^ The variety with double 



