226 COMPOSITE, (composite family.) 



1. A. iriillefolium, L. (Common Yakkow or Milfoil.) Stems 

 simple ; leaves twice-pinnately parted ; the divisions linear, 3 - 5-cleft, crowded ; 

 corymb compound, flat-topped; involucre oblong; rays 4-5. sAort, white (some- 

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



2. A. PtAkmica, L. (Sneezbwokt.) Leaves simple, lance-linear, sharply- 

 serrate with appressed teeth; coiymb loose; ra^s 8-12, much longer than the 

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



54. L.EUCANTHEMUM, Toum. Ox-ete Daisy. 



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

 broad and flat involucre imbricated, witt scarions margins. Eeceptacle flattish, 

 naked. Disk-corollas with a flattened tube. Achenia of the disk and ray sim- 

 ilar, striate, destitute of pappus. — Perennial herbs, with toothed or pinnatifid 

 leaves, and large single heads terminating the stem or branches. Kays white ; 

 disk yellow. (Name composed of Xcukos, white, and ni/Se/MV, a flower, from 

 the white rays.) 



1. I.. vulgXee, Lam. (Ox-eye or White Daisy. White-weed.) 

 Stem erect, nearly simple, naked above; root-leaves spatulate, petioled, the 

 others partly clasping, all cut or pinnatifid-toothed ; scales of the involucre with 

 rusty brown margins. ( Clirysinthemum Leucanthemum, L.) — Eields and 

 meadows ; too abundant. June, July. A pernicious weed, with large and 

 showy heads : in Connecticut is a variety with short rays. (Nat. from Eu.) 



55. MATRICARIA, Toum. Wild Chamomile. Eeteefew. 



Heads many-flowered ; the rays pistillate, or wanting. Scales of the invo- 

 lucre imbricated, with scarious margins. Receptacle conical or hemispherical, 

 naked. Disk-flowers flattened or terete. Achenia angular, wingless. Pappus 

 a membranaceous crown or border, or none. — Smooth and brandling herbs, 

 with divided leaves and single or corymbed heads. Rays white : disk yellow. 

 (Named for reputed medicinal virtues.) 



1. WI. PARTHiNiuM, L. (FEVERrEW.) Lcavcs twice-pinnately divided; 

 the divisions ovate, cut; heads corymbed, with rays. Ij. (Pyrethrum Parthenium, 

 Smith.) — Escaped from gardens in some places. (Adv. from Eu.) 



2. M. discoidea, DC. Low (6'-9' liigh) ; leaves 2 - 3-pinnateIy parted 

 into short linear lobes ; heads rayless; scales of the involucre oval, with broad 

 margins, much sliorter tlian the conical disk ; pappus obsolete. (D ®. — Illi- 

 nois, opposite St. Louis. An immigrant from Oregon ? (Eu. 7) 



56. TANACEXUM, L. Tansy. 



Heads many-flowered, nearly discoid, all fertile ; the marginal flowers chiefly 

 pistillate and 3 - 5-toothed. Scales of the involucre imbricated, dry. Recepta- 

 cle convex, naked. Achenia angled or ribbed, with a large flat top. Pappus a 

 short crown. — Bitter and acrid strong-scented herbs, with 1 - 2-pinnately dis- 

 sected leaves and rather large corymbed heads. Flowers yellow. (Name said 

 to be a corruption of dBavacrla, undying, from its durable flowers.) 



