458 Order 10.— COMPOSITE 



chaffy ; aclicnia without a pappus. — If European herbs with much crV 

 vided, alternate lvs. Hds. radiate. 



1 A. Millefolium L. Lvs. bipinnatifid, with linear, dentate, mucronato seg- 

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

 pastures, &c, N. Eng. to Or. and Arctic America. St. a foot high branching at 

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

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

 is very pretty in gardens. 



2 A. ptarmica L. Sneezewort. Lvs. linear, acuminate, equally and sharply ser- 

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

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

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

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

 occurs which is quite ornamental in pots. Aug. f § Eur. 



72. LEUCAN'THEMUM, Tourn. White-weed. (Gr. XsvkSg, white, 



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

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

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

 radiate. 



It. vulgare Lam. Lvs. amploxicaul, lanceolate, serrate, cut-pinnatifid at baso; 

 6t. erect, branching. — 21 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 potiolate, with deep and irregular teeth, upper- 

 ones small, subulate, those of the middle sessile, clasping, deeply cut at base, with 

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

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



73. MATRICARIA, Tourn. Fever Few. Involucre scales imbricate, 

 many-flowered, with membranous margins ; receptacle conical or con- 

 vex, naked; pappus a membranous margin crowning the achenia, or 

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

 out rays. (Pyrethrum, Smith.) 



M. partlienittni L. Hds. radiate; lvs. petiolatc, flat, tripinnate, tho segm. ovate. 

 cut ; ped. branching, corymbous ; st. 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 their fine pyramidal form, surmounted 

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

 weoks. f Eur. 



2 M. discoidea DC. lids, discoid; lvs. sessile, 2 to 3-pmnate'y 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. Balsamita"Willd. English Mint. Pubescent; hds. discoid; st. erect; 

 lvs. ovate, oblong, serrate, tho 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, minxite tomentum, with the fragrance of spearmint. 



74. CHRYSANTHEMUM, (Gr. X9 va6 ^ g°M, tivdoc, 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. 

 lids, radiate. 



1 C. coranarium L. Annual ; st. branched ; lvs. bipinnatifid broader at tho 

 summit, acute. — Native of S. Europe and KT. Africa. Tho variety with doubla 



