188 COMPOSITE FAMILY. 



solitary long-stalkctl head, the outer flowers very large and blue, with white or 

 rose-colored varieties, (y (a) 



C. montana. Cult, from Eu. : low and stout stems from creeping root^ 

 stock, leaves lance-oblong, head larger, bat flowers similar to last. % 



§3. AMBERn6A. Marginal starile flowers many : pappus of varrow chaff , or ■ 

 none : scales of head naked and smooth. Cult, for ornament, from Asia. 



C. odor&ta, or Ambereoi, Sweet Sultana. Smooth, with mostly pin- 

 natifid leaves, long-stalked head of yellow fragrant flowers, the outer ranks 

 enlarged, and chaffy-bristled pappus. ® 



• C. mosch^ta. Musk-scented S., has rose-purple or white musk-scented 

 flowers, the outer little enlarged, and no pappus. ® 



9. XAWTHIUM, OOCKLEBUR, CLOTBUR. (Name from the Greek 

 for yellow, the plants said to yield that color.) Coarse and vile weeds, with 

 stout and low branching stems, alternate and petioled merely toothed or lobed 

 leaves, and obscure greenish flowers, produced all summer. © 



X. Struin&,riuin, Common C. Barnyards and waste manured ground : 

 rough, 1° - 2° high, with broadly triangular-hearl>shaped toothed or slightly 

 lobed leaves on long petioles ; the fruit a bur fully ^' long, with 2 straightish 

 beaks at the apex. 



Var. echin&,tuni, on sandy shores, has a turgid bur 1' long, with incui-ved 

 beaks and more numerous prickles, beset with glandular bristles. - 



X. spinosum, Spiny C. Sandy shores and waste places, E. & S. 

 Hoary ; the branching stems armed with slender triple prickles at the base of 

 the narrow short-petioled leaves ; bur small, with a single beak-like tip. 



10. AMBROSIA, RAGWEED. (The classical name means /o«f_/Sr'«Ae 

 Gods: perhaps sarcastically applied to these miserable weeds.) Leaves oppo- 

 site or the upper alternate, mostly lobed or cut : flowers greenish, all summer 

 and autumn. ® 



A. trifida, Great Ragweed. Tall coarse herb along low borders of 

 streams, 4° -10° high, rough, with opposite deeply 3-lobcd leaves on margined 

 petioles, the lobes lance-ovate and serrate, staminate heads in racemes, their in- 

 volucres 3-ribbed -on one side, the fertile one or fruit obovate and with 5 or 6 

 ribs ending in a tubercle or spiny point. 



A. bidentkta. Prairies from III. S., 1° - 3° high, hairy, very leafy ; the 

 leaves alternate, closely sessile, lanceolate, and with a short lobe or tooth "on one 

 side near the base ; heads in a dense spike, the top-shaped involucre of the sterile 

 ones with a large lanceolate appendage on one side. 



A. artemisisefdlia, Roman Wormwood, Hogweed, or Bitterweed. 

 Waste places and roadsides, l°-3° high, hairy or roughish ; with twice ]iin- 

 natifid leaves cither opposite or alternate, pale or hoary beneath, staminate 

 heads in panicled racemes or spikes, the small roundish fruit with about 6 little 

 teeth or spines: 



11. TANACETUM, TANSY. (Old name, said to be a corruption of 

 Athanasia, undying, from the durable flowers.) Fl. all summer. ^ 



T. vulg&re, Common Tansy, from Eu. : cult, in old gardens, and a road- 

 side weed, 2° -4° high, smooth, strong-scented and acrid, with deep green 1-3- 

 pinnately compbund leaves, the leaflets and winged margins of the petiole cut- 

 toothed ; in var. CRfspCM, leaves more cut and crisped. 



T. Balsamlta, Costmary : a garden herb, from Eu., 1° - 2° high, smooth, 

 with pleasant scent, the pale leaves oblong and nearly toothed, and small heads 

 pf pale yellow flowers. 



12. ARTEMISIA, WORMWOOD. (Dedicated to Artemis, the Greek 

 Diana.) n. summer. 



» Leaves lioary or cottony, at least underneath. ^ 

 A. Absinthium, Common Wormvtood, from Eu. ; in old gardens and 

 a roadside weed; strong-scented, silky-hoary, with stems 2° -4° high and rather 



