226 COMPOSITE. (COMPOSITE FAMILY.) 



1. A. Millefdlium, L. (COMMON YARROW or MILFOIL.) Stems 

 simple ; leaves twice-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 

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

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



54. L.EUCANTHEMUM, Toura. OX-EYE DAISY 



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

 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 \CVKOS, white, and (iv6ep,ov, a flower, from 

 the white rays.) 



1. li VULGARE, 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. (Chrysanthemum Leucanthemum, L.) Fields 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, Tourn. WILD CHAMOMILE. FEVERFEW. 



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

 ^ucre 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 branching herbs, 

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

 (Named for reputed medicinal virtues.) 



1. HI. PARTHENIUM, L. (FEVERFEW.) Leaves twice-pinnately divided; 

 the divisions ovate, cut; heads cort/mb?d, with rays. y. (Pyrethrum Parthenium, 

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



2. III. diSCOldea, 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 1 ? (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- 

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

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



