COLOMBIAN EUPATORIUMS. 205 



panic'lo diffuse, its lower hranelies opposite and uj)per inoslly alternate, 

 very slender; pedicels filiform, 1-9 mm. long; heads 4.5 mm. high, 

 about 25-flowered, 3.5 mm. in diameter; involucre turbinate-cam- 

 panulate, persistent and at length reflexed ; scales lanceolate to lance- 

 linear, thin, green, the inner subequal, glabrous, a few of the outer 

 considerably smaller, successively- graduated, and more or less puberu- 

 lent dorsally; receptacle small, flat; corollas lilac-tinged or pinkish, 

 2 mm. long; the proper tube 0.5 mm. long, much exceeded by the 

 distinctly enlarged subcylindric throat; limb externally hispidulous; 

 achenes (immature) pubescent, at least on the angles. — Proc. Am. 

 Acad. liv. 253 (1918). 



Intendencia del Choco: Falls of Truando, SchoU, nos. 2 (Field Mus., phot. 

 Gr.), 1 (Field Mus., phot. Gr.). 



A delicate species with habit of the Costa-Rican E. sideritidis 

 Benth. but more slender, w^ith leaves more pubescent, only half as 

 long, and crenate instead of incisely serrate. The related E. Sinclairi 

 Benth of Costa Rica and Panama has broadly ovate leaves with 

 relatively longer petioles. The Ecuadorian E. lloense Hieron., of 

 somewhat similar habit and inflorescence, has longer but much fewxr- 

 flowered heads, larger leaves, etc. 



40. E. microstemon Cass. Annual, erect, weak and slender, 

 1.5-7 dm. high, puberulent; stem soft, terete, of ten flexuous ; leaves 

 opposite (except sometimes the uppermost), deltoid-ovate, 2.5-7 cm. 

 long, 2-5.5 cm. wide, somewhat acuminately narrowed to a mostly ob- 

 tuse tip, crenate-serrate except at the subtruncate base, thin, green on 

 both surfaces, scarcely paler beneath; heads about 4 mm. high, loosely 

 paniculate; pedicels filiform; involucre campanulate; scales thin, 

 about 3-4-seriate, with mostly 2 pale ribs and 3 green nerves; the 

 outer scales lanceolate, acute, the inner linear-oblong, rounded at the 

 somewhat scareous tip; corollas w^hite or (in the formal var. lilacinum 

 Ktze.) lilac— Diet. xxv. 432 (1822); Ktze. Rev. Gen. i. 338 (1891). 

 E. paniculatum Schrad. Comm. Gott. vi. 130 (1827). E. Berterianum 

 (Spreng.) Colla, Mem. Acad. Taur. xxxiii. 130, t. 8 (1929). E. 

 urticifolium Banks ex Griseb. Fl. Brit. W. Ind. 362 (1861). " Erio- 

 pappus paniculatus Bess. Cat. Sem. Hort. Volh. a. 1819 " and " Ager- 

 atum paniculatum Hornem. Cat. Sem. Hort. Hafn. a. 1822 " ace. to 

 Schrad. 1. c. (1827). Mikania Berteriana Spreng. Syst. iii. 423 (1826). 

 E. guadalupense DC. Prod. v. 170 (1836); Hieron. in Engl. Bot. 

 Jahrb. xxviii. 573 (1901), excl. syn. E. Sinclairii; Heering, Mem. Soc. 

 neuchat. Sci. Nat. v. 418 (1913); not Spreng., see Urb. Symb. Ant. 

 iv. 625 (1910). 



