

: 
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POLY GAMIA, SUPERFLUA. 127 
May-weed. Wild Chamomile. Stinking Chamo- 
mile. Dog’s Fennel. 
A well-known weed, resembling common Chamomile. 
Flowers white. In wastes every where, and in profusion in 
the streets of our suburbs. Possesses medicinal virtues, (See 
Veg. Mat. Med. U.S.) Annual. All summer. 
$22. ACHILLEA. Gen. pl. 1513. ( Corymbifere.) 
Calix ovate, imbricated. Rays 5 to 40, 
roundish. Receptacle paleaceous. Pappus 
none. 
1. A, leaves bipinnatifid, hairy ; the segments li- millefolium. 
near-dentate, mucronate; stem furrowed.— 
Smith and Willd. 
Icon. Fl. Dan. 787. Engl. Bot. 758. Wood- 
ville’s Med. Bot. vol. 1. p. 179. t. 64. 
Yarrow. Milfoil. 
Yarrow has been introduced from Europe, but is now per- 
fectly naturalized. About eighteen inches high. Flowers 
white. Possesses medicinal virtues. (See Woodville’s Med. 
Bot.) In fields, hedges, and by fences, every where common. 
Perennial. June, July. 
323. HELIOPSIS. Pers. Syn. 2. p. 473. ( Corymbifere.) 
Calix imbricated, scales subovate, lined. 
Rays \arge and linear. Receptacle palea- 
ceous, conic, palea lanceolate. Seeds 4- 
sided. Pappus none.—Nutt. 
1. H. leaves opposite, ovate-serrate, three-nerved, levis. 
—Pers. 
Heliopsis levis, Pers. 
Buphthalmum helianthoides, Willd. 
Helianthus levis, Sp. Pl. 1278. and L’Herit. 
Stirp. 
Rudbeckia oppositifolia, Sp. Pl. 1280. 
Silphium solidaginoides, Sp. Pl. 1302. 
