212 DICOTYLEDONOUS PLANTS. 



C. Icucanthemum Linn. : stem erecl, brandling ; leaves clasping, 

 .anceolate, deeply notched and toothed at the base. 



HAB. Fields, 6cc. Can. to Car. June Aug. If. Stem 12 

 feet high, sparingly branched. Flowers solitary on the branches, 

 large ; rays white ; disk yellow. Introduced. Ox-eye Dai*[t. 



53. ANTHEMIS. Linn. 



Involucre hemispherical, subequal. Rays more than 5. 

 Receptacle chaffy ; chaff flat, with rigid acuminate points. 

 Pappus none or a membranous margin. 



Syngenesia. Supcrflua. 



1. A. arvcnsis Linn. : leaves bipinnate ; segments lanceolate-linear; 

 receptacle conic ; chaft' lanceolate ; acines crowned with a margin. 

 HAB. Waste grounds. Penn. to Virg. Aug., Sept. . Stem 

 branched and with the leaves hoary-pubescent. Flowers at the 

 end of each branch, large ; disk yellow ; rays broad, white. In- 

 troduced. Common Chamomilc. 



9. A. cotnla Linn. : leaves bipinnatifid ; segments subulate, 3-part- 

 ed ; receptacle conic ; chaff setaceous ; pappus none. 



HAB. Road sides. N. Y. to Car. W. to Miss. June Oct. 

 . Stem a foot high, erect, branched. IVowers solitary, termi- 

 nal ; disk convex, yellow ; rays white. An exotic, now almost 

 every where naturalized. May-weed, 



54. ACHILLEA. Linn. 



Involucre ovate, imbricate. Rays 510, roundish. Re- 

 ceptacle chaffy. Pappus none. Syngenesia. Superflua. 



1 . A. pta.rm.vM Linn. : leaves linear-lanceolate, acuminate, equally 

 and acutely serrate, smooth. 



HAB. Dry swamps. Arc. Amer. Can. and N. Y. Aug., Sept. 

 If. Pursh. Stem 1 3 feet high, erect, terminating in a large 

 corymb. Flowers white. Introduced. 1 Sneeze-wort. 



2. A. mittcfolium Linn. : stem furrowed ; leaves bipinnate, slightly 

 hairy ; segments linear, toothed, acute. 



HAB. Fields and 'road sides. Can. to Car. N. to Arc. Amer. 

 W. to Miss. June Aug. H. Stem erect, branched at the 

 top. Flowers in large dense terminal corymbs ; rays 4 or 5, 

 white or rose coloured. A powerful astringent. Introduced. ? 



Yarrow. 



ORDER LXV11I. CAMPANULACE.E. Lind. 



Calyx superior, usually 5-lobed, (sometimes 3 8,) persis- 

 tent. Corol monopetalous, inserted into the top of the calyx, 

 usually 5-lobed, (sometimes 3 8,) withering on the fruit, 

 regular ; aestivation valvate. Stamens inserted into the calyx 



