TROPICAL AMERICAN F.UPATORIEAE. 237 



apice cum appendice ovato-oblonfi^o munitis basi distinctc suhsa^it- 

 tatis; receptaculo piano glahro. — Colombia: near Bogota, alt. 2700 

 m., Bros. Apollinaire & Arthur, no. 94 (type Gr., dupl. U. S.). 



This species in many respects closely approaches E. viscosissimum 

 Rolfe, Gard. Chron. ser. 3, xxxix. 274 (1906), a plant of Lower Cali- 

 fornia. It shows, however, a variety of minor differences which to- 

 gether with its very different habitat and widely separated range 

 indicate clearly that it is to be regarded, at least for the present, as a 

 distinct species. In E. viscosissimum the style-branches are strongly 

 clavate, and the corolla has a throat distinctly exceeding the proper 

 tube into which it passes ^'ery gradually, while in the present species 

 throat and tube are the same length and the demarcation between 

 them is rather sharp and definite. The achenes in E. viscosissimum 

 have the ribs provided with ascending short bristles while in the present 

 species the bristles are divaricate. Furthermore, the involucral scales 

 in E. viscosissimum have the 3 nerves more or less branched in many 

 instances, which does not appear to be the case in the Colombian plant. 

 Somewhat nearly related is the Mexican E. cardiophyUum Robinson, 

 but notwithstanding many points of resemblance it is clearly distinct, 

 having fewer-flowered heads, leaves of firmer texture, and a glabrous 

 corolla. 



E. (§ Subimbricata) arcuans, spec, nov., fruticosum; ramis tere- 

 tibus valde flexuosis glabratis, ramulis arcuatis angulatis ferrugineo- 

 tomentosis; foHis parvis (1.5-3 cm. longis 1-1.5 cm. latis) oppositis 

 petiolatis ovatis subacuminatis basi rotundatis supra mediam partem 

 utroque 2-3-dentatis paullo crassiusculis vix membranaceis a basi 

 conspicue 3-costatis supra subglabris cum nervis depressis, subtus 

 olivaceis in nervis prominulentibus sparse pubescentibus; petiolo 

 gracile ca. 5 mm. longo; capitulis 7 mm. altis; ca. 10-floris; involucri 

 subcylindrici squamis ca. 16 sub-3-seriatis valde inaequalibus oblongis 

 obtusis vel apice rotundatis 3-5-costatis obscure ciliolatis aliter 

 glabris; corollis glabris 4 mm. longis, tubo proprio 2.4 mm. longo 

 gracili, faucibus 1.3 mm. longis primo sensim ampliatis deinde paullo 

 contractis; achaeniis glabris gracilibus 2.5 mm. altis. — "New 

 Grenada" without more exact locality, Triana, no. 1191 (type K., 

 phot. Gr.). 



E. BALLOTAEFOLiuM HBK, Nov. Gen. et Spec. iv. 121 (1820). 

 Study of the available Colombian material of this species discloses 

 two pretty readily distinguishable varieties, which may be charac- 

 terized as follows: 



Var. typicum, involucri squamis lanceolatis modice firmis fere ad 



