Estimated probability density functions of the elevation, latitude and temperature of the range of selected species.

<p>(A) <i>Pinus albicaulis</i>; (B) <i>Tsuga heterophylla</i>; (C) <i>Pinus monticola</i>; (D) <i>Cornus nuttallii</i>. The solid line represents the distribution of mature trees and the dashed line the distribution of seedlings. Vertical lines represent the estimated mean of the distribution. The first column shows the elevation, the second latitude, and the third mean annual temperature. Ordinates are not shown because the figures are scaled so that the area under the curves is 1.