abscission

abscission zone subapical;

离区尖端；

Petiole narrowly winged basally or proximally, with a subapical abscission zone;

叶柄狭翅基部或下部的，具一尖端的离区；

Tyloses are often found in injured tissue, older wood, and below an abscission layer, and can completely block the conducting vessel.

受损害的组织、衰老的木材和离层下方的位置常发现侵填体，这可以完全阻塞负责运输的导管系统。