6 ROBINSON 
‘. 
viridibus in nervis obscure puberulis subtus vix pallidioribus mem- 
branaceis; petiolis gracilibus 8-30 mm. longis; cymis compositis in 
caule ramisque terminalibus trifidis conjunctim paniculam foliaceo- 
bracteatam formantibus, particularibus subglomerato-congestis; pedi- 
cellis gracilibus flexuosis 1-2 mm. longis; capitulis ca. 20-floris 5 
mm. altis 4 mm. diametro; involucri squamis ca. 3-seriatis gradatis, 
extimis ovatis vel ovato-lanceolatis saepe acutiusculis puberulis, 
interioribus anguste elliptico-oblongis apice rotundatis viridi-striatis; 
corollis lilaceis 2.5 mm. longis glabris, tubo proprio 0.7 mm. longo, 
faucibus cylindraceis 1.4 mm. longis, limbo 5-dentato suberecto 0.4 
mm. longo; pappi setis ca. 18 delicatule capillaribus albis scabratis; 
achaeniis glabris 1 mm. longis fuscis sparse hispidulis—Honpuras: 
Department of Copan, on rocks along the Moljd River, Hacienda 
Limén, 11 May, 1919, Dr. S. F. Blake, no. 7347 (U. S., phot. and 
fragm. Gr.). 
In all characters of inflorescence, involucre, florets, and achenes 
this plant appears essentially identical with the common and variable 
annual weed E. pycnocephalum Less. However, the leaves are here 
exceedingly different, being on the average no less than 5 times as long 
as broad while in E. pycnocephalum they average 1.5 times as long 
as wide or on secondary shoots of injured, mowed, or browsed indi- 
viduals at most 2.5 times as long as wide. Furthermore, the teet 
of the leaves are here only 2-4 on each side while in E. pyenocephalum 
there are 7-25 on each side. It is not impossible that this plant 
may ultimately be found to intergrade with E. pycnocephalum but as 
no intermediates have thus far been found in’ an examination which 
has included upward of 100 sheets of the latter species 1t seems 
best to give this striking plant from Honduras specific rank. It 1s a 
pleasure to name it for its collector, Dr. S. F. Blake, who among other 
activities has contributed much to the knowledge of the tropical 
American Compositae. aap 
E. (§ Subrimbricata) eucosmum, spec. nov., fruticosum 
florescentia puberula excepta glaberrimum; caule tereti rufescenti- 
runneo maturitate cum cortice griseo obtecto; ramis patenter curY” 
ato-adscendentibus; foliis oppositis ovatis acuminatis basi —— 
vel acutis ca. 1 dm. longis 5 em. latis argute serratis (dentibus er 
mm. altis 2-4 mm. basi latis) utrinque glabris firmiter coriacels ee 
tus pallidioribus non punctatis reticulato-venosis sed venis — 
vel vix prominulentibus 2-4 mm. supra basin 3-nervatis et culm with 
ulis intramarginalibus instructis; petiolo ca. 2 em. longo <= 
pureo flexuoso; corymbis terminalibus valde convexis C@- 1 am. 
in- 

