266 composite, (composite family.; 



weed, with large and showy heads : in Connecticut is a variety with inconspicu- 

 ous rays. (Nat. from Eu.) 



2. Ij. Parthenium, Godron. (Feverfew.) Tall, branched, leafy ; leaves 

 twice-pinnatcly divided ; the divisions ovate, cut ; heads corymbed, rather small. 

 (Matricaria Parthenium, L. Pyrethrum Parthenium, Smith.) — Escaped from 

 gardens in some places. (Adv. from Eu.) 



55. MATRICARIA, Tourn. Wild Chamomile. 



Heads many-flowered ; the rays pistillate, or wanting. Scales of the involu- 

 cre imbricated, with scarious margins. Receptacle conical, at least in fruit, na- 

 ked. Achenia angular, wingless. Pappus a membranaceous crown or border, 

 or none. — Smooth and brandling herbs (ours annuals or biennials) with di- 

 vided leaves and single or corymbed heads. Rays white or none : disk yellow. 

 (Named for reputed medicinal virtues.) 



1. M. inodora, L. Leaves twice-pinnately divided into fine almost filiform 

 lobes ; heads large, naked-peduncled, and with many long rays ; pappus a short 

 crown or border. — (Wild far northward.) Roadsides, Eastport, Maine, Prof. 

 Verrill. Aug. (Adv. from Eu.) 



2. M. discoidea, DC. Low (6' -9' high); leaves 2 - 3-pinnately parted 

 into short linear lobes; luads rayhss, short-peduncled ; scales of the involucre 

 oval, with broad margins, much shorter than the conical disk ; pappus obsolete. 

 — Banks of the Mississippi opposite St. Louis. Probably an immigrant from 

 Oregon, now extending eastward : also established in N. Europe. July- Sept. 



56. TANACETUM, L. Tansy. 



Heads many-flowered, nearly discoid, all fertile ; the marginal flowers chiefly- 

 pistillate and 3-5-toothed. Scales of the involucre imbricated, dry. Reeep* 

 tacle convex, naked. Achenia angled or ribbed, with a large flat top. Pap- 

 pus a short crown. — Bitter and acrid strong-scented herbs (ours perennial), 

 with 1 - 3-pinnately dissected leaves, and corymbed heads. Flowers yellow ; in 

 summer. (Name said to be a corruption of ddavacria, undying, from its durable 



flowers.). 



1. T. vulgare, L. (Common Tansy.) Stem (2°-4° high) smooth; 

 leaflets and the wings of the petiole cut-toothed ; corymb dense ; pistillate 

 flowers terete; pappus 5-lobed. - Var. cri'spum has the leaves more cut and 

 crisped. — Escaped from gardens to roadsides. (Adv. from Eu.) 



2. T. Huronense, Nutt. Hairy or woolly when young, stout (1°-?° 

 high); lobes of the leaves oblong ; heads large (£'-§' wide) and usually few; 

 pistillate flowers flattened, 3-5-cleft; pappus toothed. — St. John's River, 

 Maine (G. L. Goodale), shores of the upper Great Lakes, and westward. 



57. ARTEMISIA, L. Wormwood. 

 Heads discoid, few- many-flowered; the flowers all tubular, the marginal 

 ■Mies pistillate, or sometimes all similar and perfect. Scales of the involucre 

 imbricated, with dry and scarious margins. Receptacle small and flattish, na- 



