BLAKE. — ENCELIA AND RELATED GENERA. 349 



F. corymbosa DC, is a true Viguicra 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 ^^ 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 Encclia, 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, micro pkylla,'^^ 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 Si7nsia 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, 

 representing all the material in the Field Columbian Museum, the 



26 FI. Chile, iv. 93 (1905). 



27 ViGUiERA corymbosa (DC.) Blake, n. comb. Flourensia corymbosa DC. 

 Prod. V. 592 (1836j; Reiche 1. c. (q. v. for vars.). Helianthus corymhosus 

 Poeppig in DC. 1. c. as syn. H. revolutus Meyen "Reise i. 311 (1843)." 

 Viguiera Poeppigii Gray, Proc. Am. Acad. xix. 6 (1883). 



28 The close resemblance of E. microphylla to Flourensia was commented 

 on by Dr. Gray (Proc. Am. Acad. xix. 7, and Syn. Fl.). 



