Leaves linear-lanceolate , segments serrate or double dentate apically .

顶部的叶线形披针形，裂片有锯齿或重牙齿。

When dissected , the treated rats turned out to have three times the usual number of newborn neurons in a brain region called the dentate gyrus .

大脑解剖实验表明用药的老鼠在称为齿状回的脑部区域生长出三倍于正常数目的神经元。

Leaf margin subregularly dentate , denticulate , or serrulate .

叶缘近规则齿，具小齿，或有细锯齿。

Leaf margin serrate or dentate .

叶缘有锯齿或具牙齿。

Leaf margin entire or loosely dentate .

松弛的叶缘全缘的或具牙齿。