MACLOSKIE : COMPOSITE. 



775 



KEY TO THE SPECIES. 

 A. Leaves pinnately divided. 



b. Twice or thrice pinnatipartite, segments oblong to lanceolate ; upper leaves simpler with 



linear lobes. Heads small and panicled. Plant hairy. pinnatifidum. 



b2. Twice pinnately divided. Corymbs crowded. Stem and leaves hispid, erodiifolium. 

 3. Lower leaves once-twice pinnatifid, the lobes linear and spinulose. Racemes panicled ; 



heads nodding. Achenes rough. sauceckicoense. 



l>4. Leaves incised-pinnatifid. Heads glomerate on opposite branches, or solitary, 6-7- 



flowered. patens. 



A2. Leaves subhastate, serrate, sessile, alternate and opposite, scabrous-hairy. Corymbs dense. 



subhastatum. 

 A^. Leaves oblong to subovate. 



b. Densely pubescent, oblong or oval, incised, attenuate-petiolate. Stems nearly leafless 



above. bacleanum. 



b2. Leaves rough, subovate, acuminate, 3-nerved, serrate to crenate. Head large. Achenes 

 shining. macrocephalum. 



b$. Hairy-tomentose. Leaves ovate-lanceolate, 3-nerved, toothed, petiolate. Panicles few* 

 headed. Achenes hirsute. patagonicum. 



I. EUPATORIUM BACLEANUM DC. 



Suffruticose, with short, dense pubescence; and terete stems nearly 

 leafless at the top. Leaves opposite, some alternate, narrowing-petiolate, 

 oblong or oval, toothed or incised. Panicles subcorymbose, with alternate 

 branches. Heads pediceled, 1 6-2o-flowered. Involucre-bracts 2-3-seriate, 

 lax-imbricate, linear-oblong, obtuse, their apex membranaceous, subciliate. 

 Pappus sordid. Achenes angled, villous. 



(S. Brazil) ; N. Patagon., near Rio Negro. 



2. EU. ERODIIFOLIUM DC. 



Herbaceous (?). Stem erect, terete, leafy and hispid below, naked and 

 hairy above. Leaves opposite, hispid on the back and margin, long- 

 attenuate to a petiole, pinnately parted upwards, with pinnatifid lobes, the 

 lobules oblong-linear, subacute. Corymbs terminal, crowded, with alter- 

 nate branches. Heads pediceled, 1 8-2O-flowered. Involucre-bracts 2- 

 seriate, a few on the outside small, acute, the inner ones oblong, basi- 

 striate, apically submembranaceous, obtuse, puberous. 



(S. Brazil) ; N. Patagon. 



Like E. bacleanum, except the hispid stem and leaves. " Menueke " 

 (Araucanian) ; its decoction is used as a sudorific. 



