COMPOSITiE. (composite FAMILY.) 289 



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

 near Lewistou, Delaware, Xutlall. (Adv. from Eu.) 



67. ACHILLEA, L. Yaurou-. 



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

 hricated, with scarious margins. Receptacle chaffy, flattish. Achencs oblong, 

 flattened, margined ; pappu.s 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.) Stemssimple; 

 leaves ttrice-pinnatel 1/ parted ; the divisions linear, 3 - 5-cleft, crowded ; corymb 

 compound, flat-topped ; involucre oblotvj ; rai/s 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. (Sneezewort.) fjeaves simple, lance-linear, sharply 

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

 broader cavipanalate involucre: flowers white. — Mass., Mich., etc. ; rare. Ap- 

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



68. MATRICARIA, Tourn. Wild Chamomile. 



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

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

 Achenes 3-5-ribbed, wingless; pappus a membranaceous crown or b(jrd('r, or 

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

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

 low. (Named for reputed medicinal virtues.) 



M. ixod6ra, L. Leaves twice-pinnately divided into fine almost fili- 

 form lobes; heads large, naked-peduncled, ami ivith man// long rai/s ; achenes 

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

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



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

 sh(n-t linear lobes; heads rai/less, short-pedunded ; scales oval, with broad 

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

 obsolete. — Banks of the Mississippi op])osite 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. 

 l)isk<-orollas with a flattened tube. Acliones of disk and ray similar, striate, 

 witliout papi)us. — Perennial herbs, with toothed, pinnatifid, or divided leaves. 

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

 Xpva-dyeeiJLov, i. e. golden flower.) 



C. LErcANTHEMUM, L. (Ox-KVE or White Daisy. White-weed.) 

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

 leaves spatulato,petioled,the otliers partly clasj)ing,all cut or i>innatifiil-toothed; 

 scales of the involucre witli rusty-brown margins. (Leucantliemnm vulgare, 

 /,(t/n.) — Fields and meadows ; abundant eastward. June, July. A pernicious 

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

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



C. Pauthkmu.m, Pers. (Feverfew.) Tall, branched, leafy; leaves 

 twice-])innatelv divided, the divisitms ovate, cut ; heads cori/mbed, rather small. 

 (Leucanthemiim Parthenium, Godron.) — Esaiped from gartlens in some 

 places. (Adv. from Eu.) 



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