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同属裸子植物的松、杉、柏,为什么必须按松、杉、柏的顺序排列而不是柏、杉、松或杉、松、柏呢?这绝不是人们叫法上的习惯,而是表示了它们的进化顺序。松、杉,柏应该以松为最原始。松的原始性状主要表现在其针叶簇生枝上成束状螺旋排列,雌球花珠鳞、苞鳞及雄球花生在新枝基部也都是螺旋状排列。多数球果的每个种鳞和苞鳞分离,种鳞成熟后完成分离,这是杉、柏所不及的。
The same pine, fir and cypresses of gymnosperms must be arranged in the order of pine, cedar and cypresses instead of cypress, cedar, pine or cedar, pine and cypress. This is by no means the habit of people, but rather the expression Their evolutionary order. Pine, fir, cypress should be the most primitive pine. The original traits of pine are mainly manifested in the spiral arrangement of the branches of the coniferous tufts. The female scales, the scales and the male peanuts are also arranged spirally at the base of the new branches. Most of each kind of scales and scales bract scales separation, seed scales mature to complete the separation, which is fir, cypress less than.