Figure 4. Five-year average (± SE) male reproductive biomass of 40 trees of Quercus agrifolia, Q. douglasii and Q. lobata in relation to female reproductive biomass.

Shown are (A) female reproductive biomass (acorns, acorn caps and aborted acorns, including unfertilized female flowers) (Regression, n = 40, F = 5.3, P<0.05, R² = 0.35) and (B) female acorn biomass (Regression n = 40, P<0.05, R² = 0.33). Species were not significantly different (all P>0.4).