235 
COMPOSITE. (COMPOSITE FAMILY.) 
scales of the involucre with rusty brown margins. (Chrysanthemum 
Leucanthemum, L.) — Naturalized in fields and meadows too exten¬ 
sively. A pernicious weed, with large and showy heads. 
44. TANACETtM, L. Tansy. 
Heads many-flowered, nearly discoid, all fertile ; the marginal 
flowers chiefly pistillate and 3 - 5-toothed, forming a kind of ray. 
Scales of the involucre imbricated, dry. Receptacle convex, naked. 
Achenia angled or ribbed, with a large flat top. Pappus a short 
crown . — Bitter and acrid strong-scented herbs, with 1 -2-pinnate- 
ly dissected leaves and rather large corymbed heads. Flowers 
yellow. (Name said to be a corruption of atfavacri'a, undying , 
from its durable flowers.) 
1 T. vulgare, L. (Common Tansy.) Stem erect, smooth ; 
leaves twice-pinnately parted, the leaflets and the margined petiole 
cut-toothed; corymb dense; rays terete; pappus 5-lobed. Var. 
crispum has the leaves more cut and crisped. U u tivate an 
naturalized. Aug. 
2. T. Hnronense, Nutt. Hairy or woolly when young, 
stout (l°-3° high); leaves 2-3-pinnately dissected, the lobes oblong; 
heads large and usually few, on stout peduncles ; rays flattened, 3-5- 
cleft; pappus toothed. U - Shore of L. Huron, and northward. - 
Disk very convex in fruit, the rays slightly exserted. 
45. ARTEMISIA, L. Wormwood. 
Heads discoid, few - many-flowered ; the flowers all tubular, 
the marginal ones pistillate, or sometimes all similar and perfect. 
Scales of the involucre imbricated, with dry and scarious margins. 
Receptacle small and flattish, naked. Achenia obovoid, with a 
small summit and no pappus. — Herbs or shrubby plants, bitter 
and aromatic, with small heads in panicled spikes or racemes. 
Corolla yellow or purplish. (Dedicated to the goddess Artemis.) 
SI. DRACtSNCULDS, Besser.— Receptacle smooth : marginal flowers 
pistillate and fertile, those of the disk sterile. 
1. A. Canadensis, Michx. (Canada Wormwood.) Smooth 
or hoary with silky down ; lower leaves twice-p.nnately d>^d the 
upper 3-7-divided; the divisions linear, rather rigid; heads rather 
llrge in panicled lacemes. U - Shore of the Great Lakes from L. 
Ontario to L. Superior. — Plant 1° - 29 high. 
2. A. caudata, Michx. (Slender-leaved Wormwood.) 
Smooth; upper leaves pinnately, the lower 2 3-pinnate y tvi ’ 
