COMPOSITE. (COMPOSITE FAMILY.) 2G5 



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

 enough from the next.) 



1. M. Cotula, DC. (Common May-weed.) Scales of the involucre 

 with whitish margins. (Anthemis Cotula, L.) — Roadsides: very common. 

 (Nat. from Eu.) 



52. ANTHEMIS, L. Chamomile. 



Heads and flowers as in Maruta, hut the rays pistillate. Achenia terete, stri- 

 ate or smooth. Pappus none, or a minute crown. — Herbs with aromatic or 

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

 heads. Rays in ours white ; the disk yellow. {'AvBefxis, the ancient name, given 

 in allusion to the profusion of the flowers.) 



1. A. arvensis, L. (Corn Chamomile.) Pubescent annual or biennial, 

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

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



2. A. nojhlis, L. (Garden Chamomile.) More downy and perennial, 

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

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

 near Lewiston, Delaware, Nuttall. (Adv. from Eu.) 



53. ACHILLEA, L. Yarrow. 



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

 Receptacle chaffy, flattish. Achenia oblong, flattened, margined. Pappus 

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

 virtues are said to have been discovered by Achilles.) 

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

 simple ; leaves twice-pinnateli/ 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, lanes-linear, sharply 

 serrate with appressed teeth; corymb loose; rai/s 8-12, much longer 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 r-carious margins. Receptacle flat or 

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

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

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

 yellow. (Name composed of \ev<6s, white, and avOefiov, a flower, from the 

 white rays.) 



1. L. vulgare, Lam. (Ox-eye or White Daisy. Whitk-weed.) 

 Stem erect, nearly simple, naked above and bearing a single large head ; root- 

 leaves spatulate, petioled, the others partly clasping, all cut or pinnatifid-toothed ; 

 scales of the involucre with rusty brown margins. (Chrysanthemum Leucan- 

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



GM—12 



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