COMPOSURE. (COMTOSITE FAMILY.) 2G5 



>cflcxcd ; the disk yellow. (Derivation unknown. — The genus not distinct 

 enough iVuni the next.) 



1. M. Con i,A, DC. (Common May-wkkd.) Scales of the involucre 

 with whitish margins. (Anthciuis Cotula, L.) — Koadsides : very coiuiuon. 

 (Nat. from Ku.) 



52. ANTHEMIS, L. Chamomile. 



Heads and flowers as in JMarutu, Imt the rays pistillate. Achcnia terete, stri- 

 ate or smooth. Tappus nunc, or a minute crown. — llerhs with aromatic or 

 strong odor, 1 -2-pinnately divided leaves, the branches terminated by single 

 heads. Kays in ours white ; the disk yellow. ('AvOffiis, the ancient name, given 

 in allusion to the profusion of the flowers.) 



1. A. AUVE.NSis, L. (CoKx CiiAMoMiLK.) Puhcscent (tn)iu(d or l/u'iiitiul, 

 resembling May -weed, but not ill-scenteil ; chaff of the receptacle lanceolate, 

 pointed ; pai)pus a minute border. — Waste places : rare. (Adv. from Eu.) 



2. A. xoiiiLis, L. (Gauukn Chamomile.) More downy and perennial, 

 pleasantly strong-scented ; sterile shoots depressed or creeping ; leaves very 

 finelv dissected ; chaff' of the receptacle blunt ; pappus none. — Established 

 near Lcwistou, Delaware, yiittall. (Adv. from Eu.) 



53. ACHILLEA, L. Yarrow. 



Heads many-flowcrcd, radiate ; the rays few, fertile. Involucre imbricated. 

 Eeceptaele chaffy, flattish. Acluiua oblong, flattened, margined. Pappus 

 none. — Perennial herbs, with small corymbose heads. (So named because its 

 virtues are s;iid to have been discovered by Achilles.) 



1. A. Millefbiium, L. (Common Yarrow or Milfoil.) Stems 

 simple; hares ticicc-jtitnidtelii parted ; the divisions linear, 3 - .5-cleft, crowded ; 

 corymb compound, flat-toj)pcd ; involucre ohiong ; rays A- h, short, white (some- 

 times rose-color). — Fields and hills : common northward. Aug. (Eu.) 



2. A. PtArmica, L. (Sneezkwort.) • Daves simple, lanre-linear, sharply 

 serrate with oppressed teeth; corymb loose; mys 8-12, nvirh lonrjer than the 

 involucre ; flowers white. — Danvers, ^Massachusetts, &c. (Adv. from Eu.) 



54. LEUCANTHEMUM, Tourn. Ox-eye Daisy. 



Heads many-flowered, radiate ; the rays numerous, fertile. Scales of the 

 broad and flat involucre imbricated, with .^carious margins. Receptacle flat or 

 convex, naked. Disk-corollas with a flattened tube. Achcnia of the disk and 

 r.ay similar, striate, without pappus. — Perennial herbs, with toothed, pin- 

 natifid, or divided leaves, and single or corymhcd heads. Rays white : disk 

 yellow. (Name comjjosed of XfuKiIr, uhlte, and avStnov, a Jhurr, from the 

 white rays.) 



1. L. vl-lgXre, Lam. (Ox-i:ve or White Dai.sy. Whitk-wkli).) 

 Stem erect, nearly simple, naked above and bearing n single large heail ; root- 

 leaves spatnlate, petioled, the others partly clasping, all cut orpinnatifid-toothed ; 

 Bcnles of the involucre with ni^ty brown margins, ((^hrysjinthemum Leucan- 

 thcinuni, L. — Fields and meadows : too abundant. June, July. A pernicious 

 G :\I— 12 



