BLAKE.— ENCELIA AND RELATED GENERA. 349 
F. corymbosa DC., is a true Viguiera and was transferred to that genus 
by Gray in 1883 under the new name V’. Poeppigii, the name corym- 
bosa being rejected as inappropriate; but Reiche 7° says: “El estremo 
de los tallos corimboso-ramoso, rara vez indiviso. Cabezuelas ter- 
minales en las ramas hacia arriba desnudas’’; and in any case the 
name corymbosa, not being preoccupied, must be retained.?”?_ The 
remaining three species, alternate-leaved glutinous shrubs with villous 
achenes noticeably thicker than in true Encelia, and with a pappus of 
two slender awns disposed to be trifid from near the base, with or 
without slender acute squamellae, form a rather definite group which 
has since been increased to about ten species. Of the six Encelias 
above mentioned four (E. collodes, microphylla,?® oblonga, suffrutescens) 
agree well with these characters, except that E. oblonga and E. suffru- 
tescens are scarcely glutinous, while the remaining two species, fully 
mature fruit of which is greatly to be desired, in their general charac- 
ters are so close to the others as to justify their allocation here. 
The genera Encelia, Geraea, and Simsia are here separated mainly 
on the strength of characters to which attention has not previously 
been directed. The fourteen species included in Encelia are all peren- 
nials with leaves all alternate, achenes very flat, villous at least 
on margins, narrowly white-bordered and generally pappusless, 
bluntish short-hairy style-branches, and receptacular chaff softly 
scarious, bluntish, falling with the achenes. The two species included 
in Geraea are annuals or biennials, with all or nearly all the leaves 
alternate, pales as in the last, longer and more hairy style-branches, 
and narrowly cuneate villous achenes with strong white border, awns, 
and conspicuous crown, the last represented on the ovary in at least 
one species by a squamellaceous corona. The twenty-two species 
included in Simsia are mostly annuals, with always some at least of. 
the lower leaves opposite, marginless thin-edged not villous achenes, 
attentuate hispid style-branches, and stiff acuminate pales persistent 
long after the achenes have fallen. The characters of these and some 
related genera are contrasted in the following key. 
In the course of this revision some 670 sheets have been studied, 
eae all the material in the Field Columbian Museum, the 
26 Fl. Chile, iv. 93 (1905). 
27 Vicurmra corymbosa (DC.) Blake, —_ sets pe ss ee set 
Prod. v. 592 (1836); Reiche L . (q. Vv. ars.). 
Poeppig in DC. l. c. as syn. H. raotuts Meven Reet ke “31L dort > 
"hth Poeppigit Gray, Proc. Am. Acad. xix. 6 (1883). 
8 The close Sa se of E. wncroplylia to Flourensia was commented 
on by Dr. Gray (Proc. Am. Acad. xix. 7, and Syn. Fl.). : 
