242 COMPOSITE. (composite family.) 



65. ACHILLEA, L. Yarrow. 



Heads many-flowered ; the rays pistillate, few and short. Seales 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. LEUCANTHEMUM, Tonrn. Ox-eye Daisy. 



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

 imbricated, broad, rounded, with Bcariona margins. Receptacle fiat or convex, 

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

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

 Pays white. 



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

 pinnatifid ; the lowest spatulate-ohovate ; 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, lj. — 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 mar-ins. Receptacle convex, naked 

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

 Leases 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 open woods, 

 West Florida, and northward. Sept. @ — Stem 2°-G° high. Receptacle 



caked. Disk-flowers abortive. 



69. SOLIVA, Ruiz & Pavon. 



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

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



