70 COMMON CANADIAN WHJ) PLANTS. 



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. 



2. X. spino'sum. (SPINY CLOTBUR.) Stem armed with con- 

 spicuous straw-coloured triple slender spines, at the bases of tlie 

 lanceolate short-petioled leaves, the latter white-woolly beneath. 

 Town of Dun das, Ontario ; the seeds having been brought in 

 wool from South America. 



6. AMBRO'SIA, Tourn. RAGWEED. 



1. A. artemisisefolia, L. (HOC-WEED.) Stem erect, 1-3 feet 

 high, branching, hairy. Leaves twice- pin nati fid, the lobes linear, 

 paler beneath. Waste places everywhere, but not so common 

 northward. 



2. A. trif ' Ida, 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. 



7. TANACE'TUM, L. TANSY. 



T. VUlga're, L. (COMMON TANSY.) A very strong-scented 

 herb, 24 feet high, smooth. Leaves twice-pinnate, the lobes 

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

 corymbed. Var. crispum, DC., is easily distinguished by its 

 crisper and more incised leaves. Old gardens and roadsides near 

 dwellings. 



8. ARTEMIS'IA, L. WOBMWOOD. 



L A. Canadensis, Michx. Stem smooth or sometimes hoary 

 with silky down, erect, usually brownish. Lower leaves twice- 

 pinnatih'd, the lobes linear. Shores of the Great Lakes. 



2. A. VUlga'ris, L. (COMMON MUGWORT.) Stem tall, and 

 branching above. Leaves yreen and smooth above, white-woolly 

 beneath, pinnatifid, the lobes linear-lanceolate. Heads small, 

 erect, in panicles. Flowers purplish. Old fields near dwellings. 



3. A, Absin'thium, L. (COMMON WOKMWOOH.) Somewhat 

 shrubby. Whole plant silky-hoary. Stem angular, braii'-ln-d, 

 the branches with drooping extremities. Leaves 2-3-pinnately- 



