COMPOSITE. 115 



16. EUPATO'RIUM, Tourn. THOROUGHWORT. 



1. E. purpu'reum, L. (JOE-PYE WEED. THUMPET-WEED.) 

 Stem tall and simple. Leaves petioled, 3-6 in a whorl. 

 Flowers purplish or flesh-coloured. Heads in dense corymbs. 

 Low grounds. 1 



2. E. perfoli'atum, L. (BONESET.) Stem short, hairy. 

 Leaves rugose, connate- perfoliate, tapering. Flowers whitish. 

 Corymbs very large. Low grounds. 



3. E. ageratoi'des, L. (WHITE SNAKE-BOOT.) Stem very 

 smooth, commonly branching, 2-3 feet high. Leaves 

 opposite, petioled, broadly ovate, pointed, coarsely serrate. 

 Flowers white, in corymbs. Low rich woods. 



17. CACA'L,IA, L. INDIAN PLANTAIN. 



C. tubero'sa, Nutt. Stem angled and grooved, tall, from 

 a thick root. Leaves 5-7-nerved, the lower lance-ovate or 

 oval, tapering into long petioles. Western Ontario. 



18. IVA, L. MARSH ELDER. 



1. I. axilla'ris, Pursh. Stem 1-2 feet high, the nodding 

 heads mostly solitary in the axils of the upper leaves. 

 Leaves small, obovate to oblong-linear, entire, sessile. 

 N. W. 



2. I. xanthiifo'lia, Nutt. Stem 3-5 feet high, the nar- 

 row spike-like clusters of heads forming a naked panicle. 

 Leaves large, broadly ovate, long-petioled, serrate. N. W. 



19. SENE'CIO, L. GROUNDSEL. 



1. S. VUlga'ris, L. (COMMON GROUNDSEL.) Hay- florets 

 wanting. Stem low, branching. Leaves pinnatifid and 

 toothed, clasping. Flowers yellow, terminal. Cultivated 

 and waste grounds. 



2. S. viSCO'SUS, L. Ray- florets very minute. Stem viscid- 

 pubescent and strong-scented. Leaves twice-pinnatifid. 

 Atl. Prov. 



3. S. au'reus, L. (GOLDEN RAGWORT. SQUAW-WEED.) 

 Rays 8-12. Stem smooth, or woolly when young, 1-2 feet 



