Matiicaria. COMPOSIT.E. 363 



— ■ A . NdisiLi'!, L., the oiHcinal Chamomile, a low perennial, mth plea^iant aromatic filiformly 

 dissected folinge, not uncommon in gardens, is said tu lie uteasioQally spontaneous, but rarely. 



A. TIM TOKiA, L., — an erect lierb, rather stout, with large heads, jellow rays, or occasionally 

 pale or partly white, and quadrangular akeues, — ha^ joiiictimes escaped from gardens. 



172. ACHILLEA, Yaill. Yarp.uw. (After .-lf/«7/M.)—Pereimial herbs ; 

 with .small and eorvmljosely cj-mose heads of white, ^"ellow, or srniietimes nise- 

 colored flowers, at least in the ray ; di,^k commonly yellow. — Linn. ( nu. no. t,(jl. 

 Pliiniiira & Jlilli'fuliuin, Tourn. Pfarmica ct Achillea, DC. — Many OM- World 

 species, very few Americaii, all perennial. 



§ 1. Heads rather narrow: recepta(.'lc at length elevated. — Achillea, DC. 



^•A. Millefolium, L. (iliLroiL or Yarrow.) From viUous-lanate to glabrate; stems 

 simple, a foot or two (on high mountains a .-pan) high : leaves elongated and narrow in out- 

 line, sessile, bipinnately dissected into uumenius small and hnear to .-etaceous-subulate divis- 

 ions : heads numerous, crowded in a fa-tigiate cyme : involucre oblong ; its bracts pale or 

 sometimes i'usc<.»us-margined, or even wholly brownish : rays 4 or 5, abotit the length of the 

 involucre, white occasionally rose-color. — Very variable : iu grassy fields of Atlantic States 

 green and mure or less glabrate, and wath open foliage (perhaps introduced from Europe) ; 

 northward and on mountains mostly lanate (var. lanuhi, Koch), with divisions of the narrow 

 leaves much crowded; including -1. gracilis & A. ixcidentale, Raf. in DC. Prodr. vi. 24; 

 .1. tomoilosii, I'ursh, Fl. ii. 319. A. lunuloso, Xutt. Jour. Acad. Philad. vii. 20; A. selacea, 

 .Sehwein. in Long Exped. ii. 119. Form with dark involucre, A. MiHefblium, var. irigrescens, 

 E. >[e\er, PI. Labrad. ; A. borealis, Bi'iig. Veg. Sitch. 149. Ptarmica borea/is, DC. — Com- 

 mon from Labrador to Alaska, south to Te-xas and California. [All X. hemisphere.) 



§ 2. Heads broader : involucre campanulate : receptacle low. — Ptarmica, 

 Tourn., DC. 



A. nnaltiflora, Hook. Tillous-pnbescent, soon glabrate: stem strict, 2 feet high: leaves 

 linear, closelv pectinate-pinnatifid into lanceolate-subulate minutely denticulate lobes, the 

 sinuses extending fully half-way to the midrib : heads in rather a close cyme . rays 10 or 12, 

 verv ^h..rt and small, white. — Fl. i. 31S ; Torr. & Gra\ , Fl. ii. 409. .1. P/.- ,«"•«, Eichards. 

 iu Frankl. Journ. 33. — Saskatcliewan to Fort Franklin and Behring .Strait; first coU. by 

 Bic/iardson and Dnimmond. 

 ~A. Ptarmica, L. ( Sxeezewoet.) A foot or two high, loosely branching above, bearing 

 more louselv disposed and pedunculate heads : lea\es glabrous, linear, finely and closely ser- 

 rate: ravs S to 12, comparativelv large, roundi-h, white. — Fl. Dan. 643; Engl. Bot. 7.57 ; 

 Pursh, Fl. ii. 5.52. Ptarmica c'ulrjaris, Blackw. Herb. t. 256; DC. Prodr. vi. 23. — "Open 

 drv swamps, Canada and Xew York," Pursh. The latter habitat unsupported. Xew Bruns- 

 w-i"ck, apparentlv indigenous in Restigouche and Kent Counties, Fowler. Locally uatui-aUzed 

 iu Mass. and :SIichigan. (Eu., X. Asia.) 



173. MATRICARIA, Tourn., L. (Xame given by the herbalists, from 

 mater or 'matrix, to herbs of reputed medicinal virtues.) — Herbs, chiefly of 

 Europe and Asia; with finely once to thrice dissected leaves, and peduncidate 

 heads, the disk-flowers yellow, those of the ray white, or occasionally (and iu one 

 of our species constantly) wanting. —Benth. & Hook. Gen. ii. 427. 



§ 1. Akenes obpyramidal, with strong and thick (^lateral and facial) ribs. — 

 Triple>in,.y<er,„um.'Schi\ltz Bip. rh,n,urw<-lin,i. Yisiani ; Boiss.. in part. 

 "M inodora L. Xearlv scentless, annual, an arctic form apparently biennial or perennial: 

 leaves o-3-p'innatelv divided into filiform or narrow lineai- lul,es : lieads large : rays half to 

 three-fourths inch "long: receptacle at length ovate: pappus a minute entire or 4-t..utlied 

 border — Fl. Suec. ed. 2,297; DC. Prodr. vi. .52 ; Torr. & Gray, Fl. ii. 412. Chr,/santl,emuin 

 '-ufhinim L Spec. ed. 2. 1253; Fl. Dan. t. 696; Sehk. Handb. t. 253. P.irethrum inudonim, 

 Smith, Engl. Bot. t. 676 ; Hook. Fl. i. 320. T ripleurospermum Inodorum, .Scliultz Bip. Taua^ 



