The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .
所观察到
球果频率梯度变异可描述如下：向四周相当有规
地渐次减少。
,夏末,在秋季开The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .
所观察到球果频率梯度变异可描述如下：向四周相当有规地渐次减少。
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