ROBINSON. —- STUDIES IN THE EUPATORIEBAE. 39 
Eupatorium gracilicaule Sch. Bip. in herb., fruticosum 3 m. 
altum oppositirameum ; ramis teretibus glaberrimis gracilibus, inter- 
nodiis ca. 5 cm. longis ; foliis ovatis longe acuminatis basi rotundatis 
vel brevissime acuminatis 3-nerviis leviter serrato-dentatis plus minusve 
falcatis utrinque glabris subtus haud vel vix pallidioribus minute 
glanduloso-punctatis ad 8 cm. longis 3-4 cm. latis, venulis subtranslucen- 
tibus, petiolo gracili patenti 2-2.5 em. longo; paniculis magnis 2-3 dm. 
diametro rotundato-corymbosis oppositirameis folioso-bracteatis multi- 
capitulatis obscurissime puberulis vel granulosis, ramis laxe patentibus, 
pedicellis gracillimis saepe flexuosis minute bracteolatis; capitulis 
6-8 mm. altis ca. 13-floris; involucri squamis laxissime “imbricatis 
linearibus acutissimis dorso sordide puberulis, intimis ca, 3 mm. longis 
subaequalibus 6-9, exterioribus paucis (2-3) brevioribus angustissimis ; 
achaeniis 5- angulatis gracilibus glabris fuscis deorsum levissime angus- 
tatis; corollis glabris 3 mm. longis verosimiliter albidis, tubo proprio 
gracili i in fauces modice ampliatos gradatim expanso, dentibus limbi 
5 brevibus patentibus; pappi setis ca. 20 tenuibus albidis aequalibus 
simplicissimis corollam fere aequantibus. —Tlacolula, Mexico, Dec. 
1839, Ehrenberg, n. 11,711 (hb. Berol., hb. Gray). This species in habit 
somewhat suggests E. stillingiaefolium DC. and HL. Mendezii DC., but 
differs from each of them in being nearly glabrous and in its much less 
imbricated involucre, ete. 
Eupatorium hemipteropodum, n. sp., herbaceum robustum ad 
3 m. altum ; caule meduloso subtereti valde striato-costato glabrato in 
sicco stramineo-brunnescenti ; foliis oppositis magnis tenuibus ovatis 
utrinque glabris et viridibus supra levissimis longe petiolatis, inferio- 
ribus ovatis subacuminatis 1.8-2.5 dm. longis 12-15 em. latis argute 
grosseque dentatis basi acuminatis et breviter in petiolo decurrentibus, 
petiolo 4—6 em. longo, foliis supremis deltoideo-ovatis 8-10 em. longis 
5-7 em. latis subduplice crenato-serratis basi acuminatis, petiolo fere a 
media parte apicem versus alato; panicula ovoidea thyrsoidea opposi- 
tiramea ca. 7 cm. diametro sequialta multicapitulata ; capitulis ca. 
10-floris ; involucri squamis stramineis in apice obtuso vel rotundato 
brunneis pluriseriatim imbricatis, interioribus lineari-oblongis, exterio- 
ribus gradatim brevioribus ovatis ciliolatis ; corollis anguste tubulosis 
glabris dentibus limbi brevissimis ; pappi setis sordide albis corollam 
subaequantibus ; achaeniis valde immaturis in et etiam inter costis 
pubentibus. — EZ. quadrangulare Millsp. Field Columb. Mus. Bot. i. 
324 (1896), not DC. E. populifolium Millsp. |. c., not HBK. £. aroma- 
tisans Millsp. 1. c. iii. 92, with figs. (1904), not DC. — Yucatan : Tzamal 
(where, ace. to Millspaugh, |. c., in general cultivation), Gaumer, n. 552 
(hb. Field Mus., hb. Gray) ; Merida, Valdez, n. 92 (hb. Field Mus., bb. 
