242 COMPOSITiE. (COJITOSITE FAMILY.) 



65. ACHILLEA, L. Yarrow. 



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

 lucre iniliriciited. Keceptacle flat or elongated, chaffy. Achenia oblong, coni- 

 prcssi'd, iiiiirLcined. Pappus none. — Pci-ennial herbs. Leaves alternate, com- 

 monly piiiniitoiy divided. Heads small, corymbose. 



1. A. millefolium, L. Stems (1° higli)simi)le, pubescent, tufted; leaves 

 lanceolate, bipinuatitid, the divisions linear, ;3-.5-clftt ; corymbs dense, compound ; 

 rays 4-5, white. — Old fields and around dwellings. Introduced. May -Sept. 



66. LEUCANTHEMUM, Tourn. O.x-eye Daisy. 



Heads many-flowered ; the rays numerous, jiistillate. Scales of the involucre 

 imbricated, broad, rounded, with scarious margins. Keceptacle flat or convex, 

 naked. Achenia nearly terete. Pappus none. — IVrennial herbs. Leaves alter- 

 nate, toothed or pinnatilid. Heads solitary, terminating the stem or branches. 

 Eays white. 



1. L. VUlgare, Lam. Stem (6'- 12' high) simple, naked above; leaves 

 pinnatitid ; the lowest spatulate-obovate ; the upper lanceolate; heads showy. 

 (ChrysanLhemum Leucanthemum, L.) — Fields. Introduced. May and June. 



67. 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. Receptacle 

 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. 



\. T. VUlgare, L. Stem smooth, erect; leaves bipinnately divided, the 

 lobes serrate ; heads eorymbose, numerous ; pnpijus ,')-!ol)cd. — rommon in 

 gardens, and sparingly naturalized in North Carolina. 1]. — ytem 1° - :i° high. 



68. ARTEMISIA, L. Woiniwoon. 



Heads few- or many-flowered, discoid ; the central flowers perfect, 5-toothcd 

 (sometimes abortive), the margiiuil ones jiistillate, 3-tootiied. Scales of the in- 

 volucre imbricated, mostly with scarious margins. Keceptacle convex, naked 

 or villous. Achenia obovoid. Pappus none. — Aromatic herbs or shrubs. 

 Leaves alternate, pinnately divided. Heads small, in i>:iniiKd sjjikes or racemes. 



1. A. caudata, Michx. Smooth; stem slender, braiuhing ; lowest leaves 

 2 -."J-iiiiinately divided, the upper ones pinnate, with the divisions filiform ; iieads 

 globular, in small racemes, forming an elongated ])anicle. — Dry open woods, 

 West Florida, and nortiiward. Sept. @ — Stem 2°-6° high. Keceptacle 

 naked. Disk-flowers idiortivo. 



69. SOLIVA, Kuiz & Pavon. 



Iieads many-flowend, moud'cious ; the fertile flowers in sovernl rows, npeta- 

 lous or nearly so ; the siaminate f^w in the centre, wiili a 3- G-iouthed corolla. 



