1898 ] FLORA OF LOWER SONORAN AND ARID ZONES 141 
the Chilian P. (GRuvELIA) pusilla. It is not identical with P. 
pusilla, and to call it a variety of that species hides the essential 
fact that the Chilian plant is a southward migration of the 
common form of GRUVELIA. 
The flat light carpels of Pectocarya are admirably adapted 
for clinging to birds or mammals because of the pectinate mar- 
gin with its recurved sete. 
POLEMONIACE. 
The Polemoniacez duplicate the characteristics of the Borrag- 
inoidew-Eritrichiee in being a boreal group with a marked 
development in the Lower Sonoran zone of North. America, 
repeated in a less marked degree in the Chilian zone. Except 
for the genus Gilia the family would scarcely come within the 
scope of this discussion, being in their South American distribu- 
tion high mountain species. 
Gilia includes some eighty North American species, falling 
under thirteen sections; and about fifteen Chilian species, mostly 
included in Eugilia, Navarretia, and Dactylophyllum, but, as in 
Cryptanthe, having an individuality of species that indicates a 
prehistoric as well as modern distribution. 
Western N. America Chili 
§ Eveiia Gilia laciniata, described originally 
Amer.; occurs likewise in 
western N. Amer. 
Gilia multicaulis, western California, 
is of G. laciniata type; straggling 
laciniate-leaved forms doubtless= G. aciniata. 
Gilia capitata and Gilia achillefolia 
are more extreme California and 
Oregon species, related to - G, laciniata. 
Gilia inconspicua, Wyoming to west- 
€rn borders of Texas, and west to 
California and British Columbia ; 
forms with laciniate radical leaves SS 
very close to - - - : i st 
G. copiapina. 
G. longifolia. 
