CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 
UNIVERSITY.— NEW SERIES, NO, XXXIX. 
By B. L. Roprnson. 
Presented March 8, 1911. Received May 4, 1911. 
I. ON THE CLASSIFICATION OF CERTAIN EUPATORIEAE 
Ageratum Gaumeri, sp. nov., annuum erectum 4 dm. vel ultra alti- 
tudine copiose ramosum modice pubescens ; caule tereti gracili medul- 
loso ; ramis oppositis adscendentibus foliosis ; foliis ovatis acuminatis 
crebre et regulariter crenato-serratis tenuibus 3.5-6 cm. longis 2.5~4 
em. latis utrinque viridibus basi integris rotundatis vix ad insertionem 
petioli acuminatis, petiolo 1.5-2.2 em. longo; inflorescentia perlaxa in 
ramulis singulis racemiformi, pedicellis 2-4 (asque ad 6) cm. longis 
unicapitulatis cum bracteolis 1-4 fliformibus minimis munitis ; capi- 
tulis oblate subsphaericis 7-9 mm. diametro ; involucri squamis linear- 
lis subaequalibus ; disco conico ; 
longe exsertis pulcherrime 
vix in angulis obscure 
is saepissime breviori- 
achaeniam longi- 
G. F. Gaumer, no. 395 (type, in 
described A. intermediwm Hemsl. differs in having stems of ——, 
i 
serrate leaves, greater smoothness, and especially in its loose 
florescence, which on the individual branches becomes somewhat 
Se fastigiatim ramosum 
Ageratum Peckii, sp. nov., annuum erectum iS? im ramosul 
5 dm. altum foliosissimum glabrum ; radice fibrosa ; caule subtereti basin 
versus crassiusculo nodoso, internodiis inferioribus brevibus, superiori- 
