COMPOSITE. Ill 



3. C. benedie'ta, L. (Cnicus benedictus, L.) Flowers 



yellow. Pappus double, of 10 long outer bristles and 10 



short inner ones. A low branching annual, with clasping 



cut leaves, and large sessile leafy-bracted heads. Atl. Prov. 



6. XAN'THIUM, Tourn. CLOTBUR. 



1. X. Canadense, Mill.,var. eehina'tum, Gray. (COM- 

 MON COCKLEBUR.) Stem rough, not prickly or spiny. 

 Leaves broadly triangular, and somewhat heart-shaped, long- 

 petioled. Fruit a hard 2-celled bur, nearly an inch long, 

 clothed with stiff hooked prickles, the two beaks of the fruit 

 long and usually incurved. Low river-banks and waste places. 



2. X. spino'sum, L. (SPINY CLOTBUR.) Stem armed 

 with conspicuous straw-coloured triple slender spines, at the 

 bases of the lanceolate short-petioled leaves, the latter white- 

 woolly beneath. Town of Dundas, Ontario ; the seeds having 

 been brought in wool from South America. 



T. AMBRO'SIA, Tourn. RAGWEED. 



1. A. artemisisefolia, L. (HOG-WEED.) Stem erect, 

 1-3 feet high, branching, hairy. Leaves twice-pinnatifid, the 

 lobes linear, paler beneath. Waste places everywhere, but 

 not so common northward. 



2. A. trifida, L., (GREAT RAGWEED) is found in low 

 grounds in the south-west of Ontario ; also at Montreal and 

 Ottawa. Stem stouter than No. 1, 2-4 feet high. Leaves 

 opposite, deeply 3-lobed, the lobes oval-lanceolate and serrate. 



8. FRANSE'RIA, Cav. 



F. Hookeria'na, Nutt. Low and diffuse, hairy. Leaves 

 bipinnatifid, at least the lower ones. N.W. 



9. TANACE'TUM, L. TANSY. 



1. T. Vulga'Pe, L. (COMMON TANSY.) A very strong- 

 scented herb, 2-4 feet high, smooth. Leaves twice-pinnate, 

 the lobes serrate, as are also the wings of the petiole. Heads 

 densely corymbed. Var. erispum, DC., is easily disting- 

 uished by its crisper and more incised leaves. Old gardens 

 and roadsides near dwellings. 



