312 ROBINSON. 



18 cm. long, 7-12 cm. wide, smoothish and green above, much paler, 

 tawny-gray, and tomentose beneath; petiole 5 cm. or more in length; 

 heads about 14-flowered, 7 mm. high, in a dense terminal tricho- 

 tomous corymb 1.5-2 dm. wide; corollas white, the proper tube 

 somewhat exceeded by the campanulate-cylindrical throat; achenes 

 dark, smooth on the faces. — Proc. Am. Acad. liv. 246 (1918). 



Magdalena: open places in the border of forest, Rio Frio, alt. 2300-2750 m., 

 Kalbreyer, no. 1956 (K., phot. Gr.). 



67. E. Trianae Robinson. Presumably herbaceous perennial 

 (base unknown); stems terete, flexuous, covered with very short 

 purplish-brown tomentum; leaves alternate, lance-linear, 6-10 cm. 

 long, 5-10 mm. wide, attenuate at both ends, obscurely and remotely 

 denticulate or entire, reticulate-rugulose above, paler and sordidly 

 gray-tomentose beneath; petiole 2-3 mm. long; heads about 28- 

 flowered, 5 mm. high and thick, in dense subsessile or shortly ped- 

 uncled globose glomerules together forming an irregidar corymb. — 

 Proc. Am. Acad. Uv. 260 (1918). 



"New Grenada"; without more precise locaHty, Triana, no. 1196 (K., 

 phot. Gr.). 



Exceedingly different from any other Colombian species of the genus 

 and easily recognized by its narrow alternate lea^■es and small sessile 

 heads. In habit suggesting a Vernon ia, but by character clearly a 

 Eupatorium. 



68. E. gracile HBK. Slender usually several-stemmed decum- 

 bent or suberect perennial 3-8 dm. high, essentially herbaceous or 

 slightly lignescent, finely pubescent or glabrous throughout; leaves 

 opposite, ovate to (rarely) lanceolate, acute or acuminate, abruptly 

 narrowed to an obtusish or rounded base, crenately or sharply serrate, 

 1.5-2.5(-4) cm. long, 7-20 mm. wide, membranaceous, usually 

 glabrous, tending to darken in drying, 3-nerved from slightly above 

 the base; petiole l-6(-10) mm. long; internodes, especially the_ 

 upper, elongated, much exceeding the leaves; branches of the in- 

 florescence ascending, slender, flexuous, trichotomously divided, the 

 branchlets almost filiform, mostly 3-headed; pedicels at maturity 

 often 1-2.5 cm. long, usually curved; heads often nodding, 30-40- 

 flowered, 6-8 mm. high, 4-5 mm. in diameter; involucre campanulate; 

 scales subequal, lance-oblong to linear, thin, closely 2(-3)-ribbed, 

 acutish to attenuate; corollas 3 mm. long, glabrous, the slender proper 



