COMPOSITE. (COMPOSITE FAMILY.) 19'.' 



63. MATRICARIA,! Tourn.. L 



Herbs, with fiuely once or thrice dissected leaves, and pedunculate heads, 

 the rays white (or wanting) and the disk-flowers yellow. 



1. M. discoidea, UC. Annual, somewhat aromatic, glahrous, a span to 

 a foot higli, very leafy : leaves 2 to 3-pinnately dissected into short and narrow 

 linear lobes: heads all short-peduncled : bracts of the inv<jlucre broadlv oval, 

 white-scarious with greenish centre, hardly half the length of the w<-ll-<lc-\i'l 

 oped greenish-yellow ovoid disk: akenes oblong, somewhat angled, with an 

 obscure coroniform margin at summit, this occasionally ])r(jduced into one or 

 two conspicuous obli(]ue auricles of coriaceous texture. — From W. California 

 to ^lontana and far northward ; becoming naturali/,cd in the Atlantic States. 



64. TANACETUM, Tourn. Tansy. 



Strong-scented, alternate-leaved, yellow-flowered perennials. Ours are low, 

 with stems rather slender and naked above, bearing rather small [2 lines 

 broad) globular heads, and leaves simply or pedately 3 to .5-cleft. 



1. T. Nuttallii, Torr. & Gray, Silvery-canescent, looset/j cespitose, & spa.n 

 high : leaves short, mostly broad-cuneate with tapering base, obtiiseh/ 3 to 5- 

 lohed at the broad summit ; those of the flowering stems usually oblong or 

 linear and entire : heads few, somerchat paniculate or loosebj clustered, some of 

 them slender-pedunculate: involucre very scarious. — Fl. ii. 415. Mountains 

 of N. Wyoming. 



2. T. capitatum, Torr. & Gray. Silvery-canescent, denseli/ cespitose, a 

 span high : leaves simply or pedately 3 to 5-parted into linear lobes, or some 

 of them only 3-cleft at summit : flowering stems scapiform or 2 to 4-leaved : 

 heads 10 or more, sessile in a globose glonierule. — Loc. cit. ^Mountains of 

 N. Wyoming. 



65. ARTEMISIA, Toum., L. Wormwood. Sage-rrush. 



Herbs and low shrubs, bitter-aromatic ; with alternate leaves and small 

 paniculate licads, commonly nodding; the flowers yellow or whitish, usuall/ 

 sprinkled with resinous globules. 



§ 1. Heads heterogamous ; the disk-flowers hermaphrodite but sterile, their ovanj 



abortive, and stifle mostly entire: receptacle not hairi/. — Dr.\cun'CULU8. 

 * Akenes and floivers beset with long cobwebbi/ and crisped hairs : spinescent 



nndershrnb. 

 1. A. spinescens, Eaton. Stout and densely branched, rigid. 4 to IS 

 inches high, villous-tomentose: leaves small, pedately 5-partc(l anti the divis- 



* Tlie following species of the Old-World penus f%n/snn/ftmn*m has hccoine extensively 

 naturalized, its Lroad hcnds and conspicuous white rays niakins: it ver>' i)n>ininenL It 

 may be characterized as follows : — 



C. Leucanthcmuvi, L. Glabrous, a foot or two hi'j;h, simple or sparinjjly bnuioJiwl : ciu- 

 line leaves spatulate, and the upper gradually narrower, boconiiu!? small ami linear, jiinnately 

 dentate or incised, partly elaspinjr at base ; radical broader, jietiolcd : liead bnmd and flat : 

 rays inch long • pnppus none. — Known as ** Ox-eye Daisy " or " Whiteweed." LmoatUM* 

 mum vuh^are. Lam. 



