226 COMPOSITE. (COMPOSITE FAMILY.) 



1. A. Millefolium, L. (Common Yarrow or Milfoil.) Sterna 

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

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

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



2. A. Ptarmica, L. (Sneezewort.) Leaves simple, lance-linear, sharply 

 Berrate with appressed teeth; corymb loose; rays 8-12, much longer than the 

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



54. LEUCANTHEMUM, Tourn. Ox-eye Daisy. 



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

 broad and flat involucre imbricated, with scarious margins. Receptacle 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. Rays white ; 

 disk yellow. (Name composed of Xev/coy, white, and avdefiov, a flower, from 

 the white rays.) 



1. Li. vclgAke, Lam. (Ox-eye or White Daisy. White-weed.) 

 Stem erect, nearly simple, Daked above; root-leaves spatulatc, petiolcd, the 

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

 rusty brown margins. (Chrysanthemum Lcucanthemum, L.) — Fields and 

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

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



55. MATRICARIA, Tourn. Wild Chamomile. Feverfew. 



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

 lucre imbricated, with scarious margins. Receptacle conical or only convex, 

 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. M. Parthenidm, L. (Feverfew.) Leaves twice-pi nnately divided; 

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

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



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

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

 margins, much shorter than the conical disk ; pappus obsolete. (J) (2). — Illi- 

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



56. TANACETUM, 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- 

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

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



