basal species

例句：

1. 1. The basal species of the tree is the one that grows in the ground.
   这棵树的基种是生长在地面的。
2. 2. The study of basic species helps us understand the ecosystem.
   研究基本物种有助于我们理解生态系统。
3. 3. The basal species of the plant is the one that produces seeds.
   植物的基本物种是产生种子的那一种。