130 COMMON CANADIAN WILD PLANTS. 



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41. BIDENS, L. Bnit-MAHIGOLD. 



1. B. frondo'sa, L. (Common Beggar-ticks.) Maya none. 

 Achenes flat, wedge-obovate, ciliate on the margins with 

 bristles, pointinij upwards, 2^awned. Stem tall, brandhed. 

 Leaves thin, long-petioled, pinnately 3-5-divided, the leaf- 

 lets ovate-lanceolate, pointed, serrate. 



2. B. conna'ta, Muhl. (Swamp Beggar-ticks.) Rays 

 none. Achenes flat, narrowly wedge-shaped, 2-4-awned, 

 ciliate with minute bristles, pointing downwards. Stem 1-2 

 feet high, smooth. Leaves lanceolate, pointed, serrate, 

 tapering and connate at the base, theJowest often 3-parted 

 and deourrent on the petiole. — In shallow water and low 

 grounds. 



3. B. eer'nua, L. (Smaller Btib-Marigold.) Says short, 

 jiale yellow. Achenes flat, wedge-obovate, 4-awned, ciliate 

 with bristles pointing downwards. Stem nearly smooth, 

 5-10 inches high . Leaves all simple, lanceolate, ■unequally 

 serrate, hardly connate. Heads nodding. — Wet places. 



4. B. ehrysanthemoi'des, Michx. (Large Buk-Mabi- 



gold.) Says an inch long, showy, golden yellow. Achenes 

 wedge-shaped, 2-4-awned, bristly dovmwards. Stem smooth, 

 G-30 inches high, erect or ascending. Leaves lanceolate, 

 tapering at both ends, connate, regularly serrate. — Swamps 

 and ditches. 



5. B. Beek'ii, Torr. (Water Marigold.) Aquatic. Stems 

 long and slender. Immersed leaves dissected into fine hair- 

 like divisions ; those out of water lanceolate, slightly con- 

 nate, toothed. Rays showy, golden yellow, larger than the 

 involucre. Achenes linear, bearing 4^6 very lon.g awns barbed 

 'fiwards the apex. — Ponds and slow streams. 



«. IIELIOP'SIS, Pers. Ox-Ete. 



1. H. ISBViS, Pers. Stem smooth, slender, branching. 

 Leaves ovate-lanceolate, acute, sharply serrate, on slendei 

 petioles. Heads showy ; peduncles elongated. — Dry open 

 thickets : London and westward. 



