COMPOSITE. (COMPOSITE FAMILY.) 289 



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

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



67. ACHILLEA, L. YARROW. 



Heaas many-flowered, radiate ; the rays few, fertile. Involucral scales im- 

 bricated, with scarious margins. Receptacle chaffy, flatfish. Achenes 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-pinnatel i/ parted ; the divisions linear, 3 - 5-cleft, crowded ; corymb 

 compound, flat-topped ; involucre oblong ; rays 4-5, short, white (sometimes rose- 

 color). Fields and hills ; common. Green and more glabrate in fields in the 

 Atlantic States, and perhaps in such cases introduced. Aug. (Eu.) 



A. PTARMICA, L. (SXEEZEWORT.) Leaves simple, lance-linear, sharplv 

 serrate with appressed teeth; corymb loose; rays 8-12, much longer than th'e 

 broader campanulate involucre ; flowers white. Mass., Mich., etc. ; rare. Ap- 

 parently indigenous on the Lower St. Lawrence. (Adv. from Eu.) 



68. MAT RIG ARIA, Tourn. WILD CHAMOMILE. 



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

 imbricated, with scarious margins. Receptacle conical, at least in fruit, naked. 

 Achenes 3-5-ribbed, wingless; pappus a membranaceous crown or border, or 

 none. Smooth and brandling herbs (ours annuals or biennials) with finely 

 divided leaves and single or corymbed heads. Rays white or none; disk yel- 

 low. (Named for reputed medicinal virtues.) 



M. IXODORA, L. Leaves twice-pinnately divided into fine almost fili- 

 form lobes; heads large, naked-peduucled, and with many long rays ; achenes 

 strongly 3-ribbed ; pappus a short crown or border. (Wild far northward.) 

 Roadsides, Eastport, Maine, Prof. Verrill. Aug. (Adv. from Eu.) 



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

 short linear lobes; lieads rat/less, short-peduncled ; scales oval, with broad 

 margins, much shorter than the conical disk ; achenes more terete ; pappus 

 obsolete. Banks of the Mississippi opposite St. Louis. An immigrant from 

 Oregon, extending eastward and becoming naturalized near railroad stations ; 

 also established in N. Europe. July -Sept. 



69. CHRYSANTHEMUM, Tourn. OX-EYE DAISY. 



Heads many-flowered ; 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. Achenes of disk and ray similar, striate, 

 without pappus. Perennial herbs, with toothed, pinnatifid, or divided leaves, 

 and single or corymbed heads. Rays white ; disk yellow. (Old Greek name, 

 Xpvirdi'def^o}', i. e. golden flower.) 



C. LEUCANTHEMITM, L. (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 or pinnatifid-toothed; 

 scales of the involucre with rusty-brown margins. (Leucanthemum vulgare, 

 Lam.) Fields and meadows ; abundant eastward. June, July. A pernicious 

 weed, with large and showy heads. It occurs with abortive, deformed, or tubu- 

 lar and laciniate rays. (Nat. from Eu.) 



C. PARTHENIUM, Pers. (FEVERFEW.) Tall, branched, leafy; leaves 

 twice-pinnately divided, the divisions ovate, cut ; heads corymbed, rather small. 

 (Leucanthemum Partheuium, Godron.) Escaped from gardens in some 

 places. (Adv. from Eu.) 



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