242 coMrosiT^. (comtositk iamii.y.) 



65. ACHILLEA, L. Yaukow. 



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

 lucre imbricated. Kcceptacle flat or elonpited, cliafly. Acheniu olilong, com- 

 pressed, margined. Pappus none. — lY-reniiial herbs. Leaves alternate, com- 

 monly pimiati'ly ilivi(U'd. Heads small, corymbose. 



1. A. millefolium, L. Stems (1° lilj^h) simple, pubescent, tufted; leaves 

 lanceolate, bipinnatifid, the divisions linear, 3-5-cleft; corynd)s dense, compound ; 

 rays 4-5, white. — Old iields and around dwellings. Introduced. May-Sej^t. 



66. LEUCANTHEMUM, Tourn. Ox-eye Daisy. 



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

 imbricated, l)road, rounded, with scarious margins. Kcceptacle 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 (G'-12' high) simple, naked above; leaves 

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

 (Chrysanthemum Leucanthcnmm, L.) — Fields. Litroduced. 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 riiibed. 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 corymbose, numerous ; pappus 5-lobed. — Common in 

 gardens, and sparingly naturalized in North Carolina. IJ. — Stem l°-2° high. 



68. ARTEMISIA, L. WoionvooD. 



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-pinnately divided, the upper ones pinnate, with the divisions filiform ; heads 

 globular, in small racemes, forming an elongated panicle. — Dry o))en woods, 

 West Florida, and northward. Sept. @ — Stem 20-6° high. Receptacle 

 naked. Disk-flowers abortive. 



69. SOLIVA, Ruiz & Pavon. 



Heads many-flowcrod, nioncecious ; the fertile flowers in .several rows, apeta- 

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



