1886. | BOTANICAL GAZETTE. 331 
Of the three species reaching Catalina, two are common to the 
immediate coast, and their migration is less a matter of wonder- 
ment than the development of an entirely new and interesting 
species (A. Nevinii) upon Clemente, which can only be accounted 
for by assuming that the potency of insular influences in the elab- 
oration of new types have succeeded in overcoming what I be- 
lieve to be the natural antagonism of the genus to the tide line." 
Localization of species is the next feature which arrests our 
attention. Hemizonia Streetsii is not infrequent on the east end 
of Catalina, extending quite down to (and there in greater abund- 
ance than elsewhere) the narrow isthmus which connects the east 
and west sections of the island. A strong current of wind at 
nearly all times sucks through this narrow causeway, across which 
one might almost throw a stone; otherwise all conditions of soil 
and climate seem identical on both sides. Diligent search during 
two seasons failed to reward me with a sight of this species from 
the west end. The current of wind seems insufficient to account 
for this peculiarity, as all other species pass and repass freely. 
Paucity of species is worthy of mention, more striking in Cata- 
se 
large and varied flora: great size, low fertile valleys, swamp 
lands, river bottoms (in miniature), rolling hills, sub-alpine ele- 
yet only a total of 153 species are reported from this island. Col- 
lections from Guadalupe and Clemente having been made only in 
the spring, will probably be augmented by future exploration, 
a 
total of only 287 Phanerogams and ferns from these three islands. 
Of these, 46, or 16 per cent. of the whole number, are strictly 
insular. Of the 287, 23, or 8 per cent., are limited to Guadalupe ; 
OE 
4This pecnliarity has been noted of the genus Astragalus more strongly than of =r 
other of the great genera characteristic of California flora: amons which may be cite 
Hosackia, Lupinus, Krynitzkia, Mimulas and Eriogonum, all of which are a undantly 
presented in closest proximity to the sea shore. 
