296 ROBINSON. 



IxTENDEXciA DEL Choco: mouth of the Xercua, Schott, no. 4 (Field AIus.). 



Axtioquia: roadsides at Guaca, alt. 1480 m., Mayor, no. 576, ace. to Heer- 

 ing, 1. c. 



Magdalena: a common weed at several points near Santa ]Marta, alt. 

 150 m., H. H. Smith, no. 522 (Gr., U. S.). 



TotiMA: river-gorge below Xalagaima, Hushy & Pennell, no. 1167 (N. Y.) 

 field loam, "La Trinidad," Libano, Pennell, no. 3372 (Gr.). 



El Valle, La Paila, Holton, no. 319 (N. Y.); near Call, alt. 300-1000 m., 

 Lehmann, no. 7700, ace. to Hieron. 1. c. 



[Mex. to Boliv., Venez., Lesser Antil., Porto Rico., and Jam.] 



A common and weedlike plant of wide distribution in the warmer 

 parts of America. The nearly related but distinct E. Sinclairi Benth. 

 of Panama and Central America may well occur in the northern parts 

 of Colombia. It is more delicate and has an involucre more turbinate 

 at the base, the very small and sharply pointed outermost scales being 

 inclined to extend down upon the summit of the almost capillary 

 pedicel. 



4L E. pycnocephalum Less. Herbaceous pereimial, 4-8 dm. 

 or more high, finely pubescent, the hairs incurved; internodes, espe- 

 cially the upper cauline, elongated (6-12 cm. in length); leaves 

 opposite, slender-petioled, deltoid-ovate, acuminate, crenate-serrate 

 except at the abruptly cuneate or more often truncate or sometimes 

 shallowly cordate base, 3.5-6 cm. long, 2-5 cm. wide, green and at 

 least sparingly pubescent on both surfaces, 3 -nerved from the base, 

 the lateral nerves sometimes again forking almost from the start; 

 inflorescence with spreading or ascending branches each bearing a 

 terminal subglobose glomerule of 7-20 or more short-pedicelled lieads; 

 these about 25-flowered, 3-5 mm. high; involucre campanulate; 

 scales about 3-ranked, the inner oblong, scarious-margined, obtuse 

 or rounded at the tip, mostly with 3 green nerxes and 2 pale ribs united 

 at base in a more or less conspicuous callosity, the intermediate and 

 outer gradually shorter oval and obtuse to rather narrowly lanceolate 

 and decidedly acute, nearly smooth to conspicuously pubescent; 

 florets normally roseate or purplish; achenes black with lighter ribs, 

 somewhat pubescent at least on the ribs.-^ Linnaea, vi. 404 (1831); 

 Hcering, Mem. Soc. neuchat. Sci. Nat. v. 419 (1913). E. Scliicdcanum 

 Schrad. Ind. Sem. Hort. Goett. 1832, p. 3 (1832); Heering, 1. c. E. 

 Schicdcanum, var. virr/afum. (Schrad.) DC. Prod. v. 159 (1836); 

 Hieron. in Engl. Bot. Jalirb. xix. 45 (1894). 



Magdalena: near Santa Marta, alt. 762 m., //. //. Smith, no. 623 (Gr.), 

 distril:). as Ageratum mexicanum. 



