COMPOSITE. (COMPOSITE FAMILY.) 265 



reflexed ; 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, but 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. ('Ai/0e/zi's, 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. NOBILIS, 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. t 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. Millefblium, 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. LETJCANTHEMTJM, Tourn. OX-EYE DAISY. 



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

 broad and flat involucre imbricated, with scarious 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 \CVKOS, white, and avdepov, a flower, from the 

 white rays.) 



1. L. VULG\RE, Lam. ( OX-EYE or WHITE DAISY. WHITE-WEED.) 

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

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

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

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



