Pinnation

A simple pinnate (unipinnate) frond of the fern, Blechnum appendiculatum.

Bipinnate leaves of species of palm in the genus Caryota

Pinnation (also called pennation) is the arrangement of feather-like or multi-divided features arising from both sides of a common axis. Pinnation occurs in biological morphology, in crystals, such as some forms of ice or metal crystals, and in patterns of erosion or stream beds.

单词	Pinnately
释义	Pinnately 英语例句库 Basal leaves rosulate, simple, usually pinnately lobed, lyrate, or runcinate, rarely entire or toothed. 莲座状，单的基生叶，羽状浅裂的通常，大头羽裂，倒向羽裂的或，很少全缘或齿。英语百科 Pinnation Pinnation (also called pennation) is the arrangement of feather-like or multi-divided features arising from both sides of a common axis. Pinnation occurs in biological morphology, in crystals, such as some forms of ice or metal crystals, and in patterns of erosion or stream beds.
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Pinnately

Pinnation