De I. VNER VEW D Forest Trees of the Pacific Slope

FOREST TREES OF THE PACIFIC SLOPE. 61
OCCURRENCE.
Confined to slopes, bluffs, and ridges. Grows well in coast sand and also heavier inland
soils. Short lived in arid situations, but does not thrive in! wet soils. Onl coast, occasionally
mixen with Monterey and Goven cypresses ; inland, forming interrupted pure forest,
occasionally with groups of California swvamp pine in mioist places.
CLIMATIC CONDITIONs -Seasonal temperalture from 25' to 95' I>. Annual average precipitation,
not over 17 inches, and wholly rain. Close proximity of range to sea gives
humid air, while at least one-third of days are cloudy or foggy.
FI'G. 21 -Pinaus radiate, open colan: a, seed.
TOLERANCE.-Very tolerant, growing in pure, dense stands, where trunks clean themselves
well and trees maintain good crown cover, under which humus accumulates rapidly.
Isolated trees usually retain low side branches, with heavy foliage until old age.
REPRoDUcTioN.-irolific annual seeder Seed with very high rate of germination and
persistent vitality. Produces cones at early age. Long persistent and closed cones shed
seed only after several years; often opened only by fire, which is followed by very dense
reprodo rtion, particularly in exposed Iineral soil.
151S-0)S---5