300 PROCEEDINGS OF THE AMERICAN ACADEMY. 
National Herbarium, and the Gray Herbarium. I wish to thank 
Mr. W. R. Maxon and Dr. C. F. Millspaugh for the loan of the mate- 
rial of Encelia under their charge, Mr. M. E. Jones for the loan of 
11 sheets of Enceliopsis and for assistance in other ways, M. Casimir 
de Candolle for a photograph of the type of Simsia lagascaeformis 
and critical notes, and Dr. Philip Dowell for aid in proof-reading. 1 
am greatly indebted to Miss Mary A. Day of the Gray Herbarium for 
assistance in proof-reading and for constant help in bibliographical 
matters, and above all to Dr. B. L. Robinson for his advice and 
guidance throughout the whole course of my work. 
Key To ENCELIA AND SOME RELATED GENERA. 
Achenes Mig flat; no squamellae except in Helianthella and oiasshaats 
VER 
Achen winged ; raye usally tertiles... e265 ea ESINA L. 
Ache aan wicca rays neu 
pe <a ~ 
Usu y leafy-stemmed herbs of mountainous regions, with gree 
: ves and freq wey foliae ceous outer involucral a Stee 
eoely Ss rrow, laciniate, and united at 
nes not ae or rerhite-rih argined. HeLIANTHELLA T.&G. 
Seapose desert plants with saisbeeeart or silvery broadly oval or 
short and indistinct, mostly united into a low sometimes en- 
tire crown; achene villous except in EZ. grandiflora, and strongly 
white-bordered........ Enceropsis (Gray) A. Nels. (p. 351.) 
Scapose, wit ith broad leaves and large solitary heads. . (ENCELIOPSIS) 
Leafy-stemmed (except EZ. scaposa, which has linear leaves); heads 
several (exept in two species with linear leaves), small or 
ium-siz 
Pales soft, bluntish, falling Hone the achenes; leaves alternate; 
east on margins 
Perennials; style-branches ‘Hunt, not villous; achenes 
without crown, usually epapp 
cELIA Adans. (p. 358.) 
EN 
Annuals . biennials; style-branches longer, villous; achene 
wly cuneate, with strong pe margin, awns, an 
ee a) Geraga T. & G. (p. 355.) 
Pales *igid, bente , persiste ne ‘wae leaves oppo- 
Fine le-branches a attenuate, hispid-villous achenes not 
e.. _.Smusta Pers. (p. 376.) 
Achenes thick weet suamella often present. 
Pappus caducous, of paleaceous awns and rarely short squamellae; herbs. 
HELIANTHUS 
oe a Pshrubs. 29; awns often aristate, squamellae usually present; 
Squamellae none, or narrow and acute; achenes a densely eg ’ 
hrub UR. : 
resinif , oft ite-leav' 
erous, often aaaen saab " UBK. 
29 Caducous in some Viguieras, e. g. V. Mandoni Sch. Bip. 
