COLOMBIAN EUPATORIUMS. 281 



Widely distributed in tlu> warinrr parts of America, common and 

 variable. The numerous varieties founded on leaf-contour, pubes- 

 cence, flower-color, odor, etc., appear to have no more than formal 

 value, since they rest upon arbitrarily selected combinations of charac- 

 ters subject to independent variation. The only variety definitely 

 reported from Colombia is the following, which to a considerable 

 extent bridges the gap between this species and E. harranguillense. 



Var. pauciflorum Hieron. Heads more slender, 10-16-flowered; 

 in\-olucre 1 cm. long, the scales pale, the intermediate and inner ones 

 tending to be acute; corollas pale violet or lilac. — Hieron. in Engl. 

 Bot. Jalu-b. xxviii. 564 (1901), as pauciflora. 



Bolivar: Cartagena, Billbcrg, ace. to Hieron. 1. c. 



Magdalena: near Santa Marta, H. H. Smith, alt. 153 m., no. 1991 (Gr., 

 U. S.). 



[Venezuela, ace. to Hieron. 1. e.] 



20. E. corymbosum Aubl. Erect much branched shrub, 1-3 m. 

 high; stems terete, finely tomentellous, the hairs curved, some of 

 them gland-tipped; leaves opposite, petiolate, deltoid, 1.7-6 cm. 

 long, nearly or quite as broad, obtuse or acute, coarsely crenate- 

 toothed except at the widely and shallowly cordate or subtruncate 

 base, yellow-green, puberulent or smooth above, paler and finely 

 pubescent on the nerves and veins beneath; petiole 1-2 cm. long; 

 heads in dense flattish compound corymbs; scales many-ranked, 

 closely appressed, their 3-5 nerves tending to spread slightly as they 

 reach the green rounded tips. — Guian. ii. 799 (1775). E. atriplici- 

 folium Lam. Encyc. ii. 407 (1786); Vahl, Symb. iii. 96 (1794); Hieron. 

 in Engl. Bot. Jahrb. xxviii. 567 (1901); Urb. Symb. Ant. iv. 623 

 (1911). E. repandum Willd. Spec. iii. 1767 (1804); Griseb. Fl. Brit. 

 W. Ind. 358 (1861). Osmia repanda (Willd.) Sch. Bip. PoUichia, 

 xxii.-xxiv. 252 (1866). 



Antioquia: near the city so named, alt. 500 m., Lehmann, no. 7996, ace. to 

 Hieron. 1. c. 



[West Indies, from the Bahamas to Guadaloupe; French Guiana, ace. to 

 Aubl.] 



No specimens of this species have been seen from the continent, 

 but it is here included on the basis of the Colombian report by Hier- 

 onymus, 1. c. 



Sect. n. SuBiMBRiCATA (DC.) Hoffm. Involucre campanulate 

 or turbinate, rarely cylindric, seldom more than twice as long as thick; 



