GENUS 90. 



THISTLE FAMILY. 



2. Anthemis arvensis L. Corn or Field Camomile. Fig. 4557. 



Antheinis arvensis L. Sp. PI. 894. 1753. 



Annual or sometimes biennial, not fetid; stem 

 finely pubescent, usually much branched, about 

 i high, the branches decumbent or ascending. 

 Leaves sessile, i'-3' long, i-2-pinnately parted 

 into linear or lanceolate acute lobes, less divided 

 than those of the preceding species and with 

 broader segments; heads commonly numerous, 

 i'-ii' broad; bracts of the involucre oblong, 

 obtuse, usually somewhat pubescent, with broad 

 scarious margins ; rays 10-18, white, pistillate, 

 spreading, mostly 2-toothed ; chaff of the obtuse 

 receptacle lanceolate, acute or acuminate ; achenes 

 oblong, obtusely 4-angled ; pappus a mere border. 



In fields and waste places, Nova Scotia to Virginia, 

 west to ^Michigan, Missouri, and on the Pacific coast. 

 Naturalized from Europe. May-Aug. 



3. Anthemis nobilis L. Garden, Scotch, 



White or Low Camomile. Fig. 4558. 

 Anthemis nobilis L. Sp. PI. 894. 1753. 



Perennial, pubescent, aromatic, much branched, 

 6'-i8' high, the branches procumbent. Leaves 

 numerous, i'-2' long, finely and compactly dis- 

 sected into nearly filiform lobes and segments; 

 heads about i' broad; bracts of the involucre ob- 

 tuse, pubescent, their scarious margins broad; 

 rays 12-18, white, spreading, pistillate, 2-3-toothed; 

 chaff of the conic receptacle broad, membranous, 

 obtuse ; achenes oblong, obtusely 3-angled ; pappus 



Sparingly escaped from gardens, Rhode Island to 

 Delaware, Michigan and Wyoming. Adventive from 

 Europe. June-Aug. 



4. Anthemis tinctoria L. Yellow or Ox- 

 eye Camomile. Fig. 4559. 



Anthemis tinctoria L. Sp. PI. 896. 1753. 



Perennial, pubescent or tomentose; stem erect, 

 branched, i-3 high, with nearly erect branches. 

 Leaves sessile, i'-3' long, pinnately divided, the 

 oblong segments pinnatifid into narrow acute 

 lobes; heads few or several, i'-ii' broad; bracts 

 of the involucre oblong, obtuse, densely tomen- 

 tose; rays 20-30, pistillate, usually 2-toothed, 

 bright yellow or sometimes paler; chaff of the 

 nearly hemispheric receptacle lanceolate, acumi- 

 nate, rather rigid ; achenes 4-angled, somewhat 

 compressed ; pappus a crown-like border. 



In fields and waste places, New Brunswick to New 

 Jersey, and locally escaped from gardens. Adventive 

 from Europe. Native also of Asia. June-Sept. 



Anthemis aurea (L.) DC., a species with small ray- 

 less heads, was found many years ago near St. Louis, 

 Missouri. 



