242 COMPOSITA. (COMPOSITE FAMILY.) 
65. ACHILLEA, L. Yarrow. 
Heads many-flowered ; the rays pistillate, few and short. Scales of the invo- 
luere 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, Tourn. Ox-rve 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. T 
1. L. vulgare, Lam. Stem (6/-12/ high) simple, naked above; leaves 
pinnatifid ; the lowest spatulate-obovate; the upper lanceolate; heads showy: 
(Chrysanthemum Leucanthemum, Z.)— 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 1M 
gardens, and sparingly naturalized in North Carolina, }— Stem 19 - 2° high. 
68. ARTEMISIA, L. Wormwoop. 
Heads few- or many-flowered, discoid ; the central flowers perfect, 5-toothed 
(sometimes abortive), the marginal ones plstillate, 3-toothed. Scales of the in- 
voluere imbricated, mostly with scarious margins. Receptacle convex, 
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 open woods, 
West Florida, and northward. Sept. (9 — Stem 29—69 high. Receptacle 
naked. Disk-flowers abortive. icc 
. 69. SOLIVA, Ruiz & Pavon. i 
.— Heads many-flowered, moncecious ; the fertile flowers in several rows, apet —— 
