TROPICAL AMERICAN EUPATORIEAE. 237 
apice cum appendice ovato-oblongo munitis basi distincte subsagit- 
tatis; receptaculo plano glabro.— Cotomsra: 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- 
ther 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 very 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 EF. 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. cardiophyllum 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; foliis parvis (1.5-3 em. longis 1—-1.5 em. 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 
subeylindrici 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 
Grenapa ” without more exact locality, Triana, no. 1191 (tyPE K., 
phot. Gr.). 
E. Battorarrouium HBK., Noy. 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 
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