322 ROBINSON. 



texture and ribbed nearly or quite to the gradually narrowed tip, the 

 outer successively shorter and narrower. — Lit., synon., and exsicc. 

 as above. 



Yar. caucense Robinson. Involucral scales subequal, tending to 

 be oblanceolate, the upper portion less gradually attenuate and of 

 softer more herbaceous texture, scarcely ribbed and dorsally more 

 pubescent. — Proc. Am. Acad. liv. 238 (1918). E. baUotaefolium 

 Hieron. in Engl. Bot. Jahrb. xxviii. 575 (1901), not precisely of HBK. 



Tolima: dry open grass-land, "El Convenio," west of San Lorenzo, alt. 

 1000-1200 m., Pe7mell, no. 3453 (Gr.). 



Huila: common in scattered bushy places on savannahs, along the Rio 

 Paez, Lehmann, no. 5675 (U. S.). 



El Valle : under low isolated thickets, on savannahs near Anserma Xueva, 

 alt. 1000 m., Lehmann, no. 3279 (Gr.). 



While such variation in the involucre is unusual in a single species, 

 it has been found impossible to detect any concomitant differences in 

 habit, foliage, florets, or achenes. Furthermore some approaches to 

 the involucre of var. caucense have been observed in the variable 

 Brazilian forms of the species. 



81. E. humile (Benth.) Robinson, comb. nov. Low perennial 

 herb; stems several, hirsute, leafy at the prostrate and somewhat 

 repent base, then erect, almost leafless and scapelike, 1.5-2 dm. high; 

 leaves opposite, petiolate, oval, obtuse or rounded at both ends but at 

 the very base somewhat cuneate, crenately about 3-toothed on each 

 side, densely hirsute on both surfaces, 4-12 mm. long, 3-10 mm. wide; 

 petiole 2-7 mm. long; corymb terminal, about 3—1 cm. in diameter, 

 convex; pedicels spreading-hirsute; heads about 20-flowered, 5-6 

 mm. high, crowded; involucre campanulate, about 3-seriate; scales 

 lanceolate, attenuate, very acute, thin-margined, 2-4-ribbed, at least 

 the outer sparingly and rather coarsely pubescent on the back; 

 receptacle, low -conical; corollas apparently whitish ])ut perhaps blue, 

 externally puberulent near the limb; achenes dark-gray, tapering to 

 the callose base, rounded to the summit. — Conoclinmm humile Benth." 

 PI. Hartw. 199 (1845). 



Cundinamarca: in Cordillera dc los Andes, near Bogota, Ilartircg, no. 1102 

 (N. Y., phot. Gr.) 



Known as yet only from the original collection. The leaves are 

 green on both surfaces, but are covered by coarse white attenuate 

 mostly curved hairs. The prostrate portion of the stems has very 



