ZOK 
a BIOLOGICAL: JOURNAL 
enn 1893. 
SOUTHERN EXTENSION OF CALIFORNIA FLORA. 
BY T. S. BRANDEGEE. 
The flora of the Peninsula of Baja California has usually been 
considered to be nearly the same as that of Southern Alta California, — 
and Mr. Hemsley for that reason has given it no place in his 
Botany of the Biologia Centrali-Americana. A region extending _ 
through nine degrees of latitude, having California for its © 
‘northern boundary and its southern portion lying within the — 
tropics, with its northern vegetable life controlled by the alterna- _ 
tion of winter and summer and its southern dependent on tropical 
rains, cannot possess a similar flora throughout its entire length. 
There is a point situated between these extremes of latitude — 
and differences of climate where there is a change in the flora, a 
change from that of the south to one that is in great part 
Californian. ‘The middle latitudes of the Peninsula do not seem > 
to have any well defined seasons of vegetable life, and the time ~ 
lowering may follow winter rains of the northern climate i 
ey should extend southward, or the summer showers from the 
pics when they reach northward. Even as far south as Mag- 
Bay this shifting of growing season is apparent, and 
its there have shown me that in two successive years 
annuals and most of the perennials burst into life with the 
x in consequence of the December rains, but during a 
g year, in January, hardly a flower could be seen, mo 
bushes were leafless and the only signs of vegetable lif 
were remnants from the profusion that existed 
fter series | of heavy tropical rains. The point 
th most decided change in | the flora is seen occurs 
