I. FURTHER DIAGNOSES AND NOTES ON TROPICAL 
AMERICAN EUPATORIEAE. a Y 
Durine the past year the writer has continued his study of the 
Eupatorium Tribe of the Compositae, devoting his chief attention to 
the Eupatoriums of Bolivia and the Mikanias of Andean South 
America. Some novelties and a few plants seemingly in need of 
further definition or transfer were inevitably encountered in the 
course of this work, and these may be placed on record as follows: 
Ageratum (§ Coelestina) rivale, spec. nov., herbaceum perenne 
repens; caulibus prostratis vel valde inclinatis 4-5 mm. crassis ad 
nodos plus minusve copiose radicantibus; ramis (cauliformibus) 
decumbentibus vel erectis 3-6(-8) dm. altis ad mediam partem 
foliosis purpureis sparse griseo-pubescentibus; foliis oppositis ovato- 
oblongis acutis serratis (dentibus 1-2 mm. altis 3-6 mm. latis utroque 
5-11) basi obtusiusculis vel subrotundatis integris utrinque viridibus 
supra subglabris paullo bullatis subtus vix pallidioribus minute 
puncticulatis et sparse in nervis venisque hispidulis 4-7 cm. longis 2-3 
cm. latis; petiolis 2-3 mm. longis subsetoso-pubescentibus; pedun- 
capitulatis; pedicellis 5-60 mm. longis; eapitulis 10-14 mm. dia- 
metro; involucri squamis anguste lanceolatis plerisque 2-costulatis 
laevibus viridibus apicem versus atropurpureis; receptaculo epalea- 
ceo; corollis ca. 3 mm. longis, tubo proprio viridescente, faucibus 
albescentibus infundibuliformibus, limbo lilaceo-caeruleo; achaeniis 
glabris ca. 2 mm. longis nigrescentibus; pappl squamis in coronam 
ca. 0.4 mm. altam irregulariter dentatam eburneam connatis.— 
PANAMA: vicinity of El Boquete, -Chiriqui, alt. 1000-1300 m., a 
trailing herb along wet bank of a brook in partial shade, 2-8 Mar. 
1911, W. R. Maxon, no. 5240 (trPE U. S., Gr.), in pastures, 2 Mar. 
1911, Prof. H. Pittier, no. 2905 (U. S.). 
The only species likely to be confused with this are A. petiolatum 
(Hook. & Arn.) Hemsl., a Nicaraguan plant with petioles mostly 8-36 
mm. long and narrower awn-pointed involucral scales; A. scabriusculum 
(Benth.) Hemsl., a plant described as an annual, scabrous to the 
touch, and having somewhat smaller heads (about 8 mm. in diameter); 
and finally the Mexican A. lucidum Robinson, which is a shrub with 
white flowers and closely scabrid-puberulent branches. 
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