242 COMPOSITE. (COMPOSITE FAMILY.; 



65. ACHILLEA, L. YARROW. 



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

 lucre imbricated.. Receptacle flat or elongated, chaffy. Achenia oblong, com- 

 pressed, margined. Pappus none. Perennial herbs. Leaves alternate, com- 

 monly pinnately divided. Heads small, corymbose. 



1. A. millefolium, L. Stems (1 high) simple, pubescent, tufted; leaves 

 lanceolate, bipinnatifid, the divisions linear, 3 - 5-cleft ; corymbs dense, compound ; 

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



66. LETJCANTHEMUM, Tourn. OX-EYE DAISY. 



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

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

 naked. Achenia nearly terete. Pappus none. Perennial herbs. Leaves alter- 

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

 Rays white. 



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

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

 (Chrysanthemum 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. 



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 in North Carolina, ty Stem 1 - 2 high. 



68. ARTEMISIA, L. WORMWOOD. 



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

 (sometimes abortive), the marginal ones pistillate, 3-toothed. Scales of the in- 

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

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

 Leaves alternate, pinnately divided. Heads small, in panicled spikes or racemes. 



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

 2 - 3-pinnatelv divided, the upper ones pinnate, with the divisions filiform ; heads 

 globular, in small racemes, forming an elongated panicle. Dry open woods, 

 West Florida, and northward. Sept. (2) Stem 2 -6 high. Receptacle 

 naked. Disk- flowers abortive. 



69. SOLIVA, Ruiz & Pavon. 



Heads many-flowered, monoecious ; the fertile flowers in several rows, apeta- 

 lous or nearly so ; the staminate few in the centre, with a 3-6-toothed corolla. 



