264 COMPOSITE, (COMPOSITE FAMILY.) 



2. P. ciliaris, L. Stein erect, smooth ; leaves linear, bristly-fringed 

 below the middle ; heads nearly sessile ; rays 3 ; pappus of the disk flowers of 

 5 lanceolate acuminate scales, of the rays only 3. Keys of Caximbas Bay, 

 South Florida. Oct. Stem 6'- 12' high. 



74. ANTHEMIS, L. MAY-WEED. 



Heads many-flowered, the rays pistillate or neutral. (Scales of the hemi- 

 spherical involucre imbricated in few rows, shorter than the disk. Receptacle 

 conical, chaffy throughout, or only at the summit. Acheuia obovoid, ribbed, 

 smooth. Pappus none. Branching annuals. Leaves alternate, thrice pin- 

 nately divided. Heads solitary, terminal. Hays white. 



1. A. Cotula, L. Stem 1 high ; divisions of the leaves linear; scales of 

 the involucre with scarious margius ; disk yellow. Waste places. Intro- 

 duced. May - June. 



75. ACHILLEA, L. YAUROW. 



Heads many-flowered; the rays pistillate, few and short. Scales of the 

 involucre imbricated. Receptacle Hat or elongated, chaffy. Acheuia ob- 

 long, compressed, margined. Pappus none. Perennial herbs. Leaves 

 alternate, commonly pinnately divided. Heads small, corymbose. 



I. A. Millefolium, L. Stems (1 high) simple, pubescent, tufted; 

 leaves lanceolate, bipinnatirid, the divisions linear, 3-5-cleft; corymbs dense, 

 compound ; rays 4-5, white. ( >ld fields and around dwellings. Introduced. 

 May - Sept. 



76. CHRYSANTHEMUM, Tourn. OX-EYE DAISY. 



Heads many-flowered ; the rays numerous, pistillate. Scales of the invo- 

 lucre imbricated, broad, rounded, with scarious margins. Receptacle flat or 

 convex, naked. Acheuia nearly terete. Pappus none Perennial herbs. 

 Leaves alternate, toothed or piunatifid. Heads solitary, terminating the 

 stem or brandies. Kays white. 



1. C. Leucanthemum, L. Stem (f/-12' high) simple, naked above; 

 leaves pinnatifid ; the lowest spatulate-obovate ; the upper lanceolate ; heads 

 showy. Fields. Introduced. May - June. 



77. TANACETUM, L. TANSY. 



Heads many-flowered, discoid ; the flowers all fertile ; the marginal ones 

 chiefly pistillate, 3-5 toothed. Scales of the involucre imbricated, dry. Re- 

 ceptacle convex, naked. Achenia angled or ribbed. Pappus a narrow border, 

 or none. Herbs with alternate dissected leaves, and solitary or corymbose 

 heads of yellow flowers. 



1. T. vulgare, L. Stem smooth, erect; leaves bipinnately divided, the 

 lobes serrate; heads corymbose, numerous; pappus 5 lobed. Common in 

 gardens, and sparingly naturalized iu North Carolina. 2/ Stem 1- 2 

 high. 





