Gexi-s S3.] 



THISTLE FAMILY. 



455 



2. Achillea Millefolium L. Yarrow. 

 Milfoil. (Fig. 3983.) 



Achillea Millefohum L. Sp. PI. Sgg. 1753. 



Perennial from horizontal rootstocks; flow- 

 ering stems pubescent, or nearly glabrous, 

 simple, or corymbosely branched above, i°- 

 2° high. Basal leaves, and those of the nu- 

 merous short sterile shoots, mostly petiolcd, 

 sometimes lo' long and U' wide, those of the 

 stem sessile, all narrowly oblong or lanceolate 

 in outline and finely dissected into narrow 

 pinnatifid segments, tomentose, pubescent 

 or nearly glabrous; heads numerous, 2"-}," 

 broad, in terminal compound dense, some- 

 what convex corymbs; involucre ovoid, its 

 bracts oblong, obtusish, pubescent; rays 4-6, 

 white, or often pink or purple. 



In various situations throughout North Amer- 

 ica; in the east occurringf as a naturalized weed, 

 ■^eeuer and less tomentose than the native west- 

 ern plant, which is probably specifically dis- 

 tinct. Xative also of Europe and .\sia. Old 

 names, Sanguinarj-, Thousand-leaf, Nosebleed, 

 Old Man's Pepper, Soldier's Woundwort. June-Nov. 



84. ANTHEMIS L. Sp. PI. 893. 1753. 



Annual or perennial herbs, with pinnatifid or dissected, alternate leaves, and usually 

 large peduncled heads of both tubular and radiate flowers, terminating the branches. Invo- 

 lucre hemispheric, its bracts imbricated in several series, scarious-margiued, appressed, the 

 outer shorter. Receptacle convex, conic or oblong, chaffy at least toward the summit, the 

 chaff subtending the disk-flowers. Ray-flowers pistillate and fertile, or neutral, the tube 

 terete or 2-winged, the ray white or 3-ellow, entire or 2-3-toothed. Disk-flowers perfect, fer- 

 tile, yellow, their corollas with 5-cleft limbs. Anthers obtuse and entire at the base. Style- 

 branches of the disk-flowers truncate. Achenes oblong, angled, ribbed or striate. Pappus 

 none, or a short coroniform border. [Greek name of Camomile.] 



.\bout 60 species, natives of Europe, Asia and Africa. 

 Rays white. 



Raj-s neutral; plant glabrous, or nearly so, fetid. i. 



Rays pistillate; plants pubescent. 



.\nnual; chaff of the receptacle acute. 2. 



Perennial; chaff of the receptacle obtuse. 3. 



Rays yellow; plant pubescent, or tomentose. 4. 



A. Colula. 



A. arvensis. 

 A. nobiiis. 

 A. linctoria. 



Mayweed. 

 Dillweed. 



1753- 



1837- 



(ralasia. 



I. Anthemis Cotula L,. 



Dog'.s, or Fetid Camomile. 

 (Fig. 39S4.) 



Anthemis Cotula L. Sp. PI. 894. 

 Maruta Colula DC. Prodr. 6: 13. 



Annual, glabrous, or sometimes pubescent 

 above, glandular and with a fetid odor and 

 acrid taste, much branched, i°-2° high. 

 Leaves mostly sessile, i'-2' long, finely 1-3- 

 pinnately dissected into narrow, or almost 

 filiform, acute lobes; heads commonly nu- 

 merous, about \' broad; bracts of the invo- 

 lucre oblong, obtuse or obtusish, usually 

 somewhat tomentose; rays lo-iS, white, at 

 length reflexed, neutral, or rarely with 

 abortive pistils, mostly 3-toothed; receptacle 

 convex, becoming oblong, its chaff bristly, 

 subtending the central flowers; achenes 10- 

 ribbed, rugose or glandular-tubcrculate; pap- 

 pus none. 



In fields, waste places and along roadsides, 

 all over North America except the extreme 

 north. Naturalized from Europe, and widely 

 distributed as a weed in Asia, Africa and Aus- 

 Other names are Mather, Dog-fennel, Dog-finkle, Morgan. June-Nov. 



%X/t- 



it. (ii-U 



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