persistent leaf造句

These cycads are generally unbranched, tall, and with persistent leaf bases.
Alien tree species such as sycamore and beech are present, in small numbers, but they generate excessive shade and persistent leaf litter.
They have subterranean to tall and erect, usually unbranched, cylindrical stems, and stems clad with persistent leaf bases ( in Australian genera ).
One subfamily, the Encephalartoideae, is characterized by spirally arranged sporophylls ( rather than spirally orthostichous ), non-articulate leaflets and persistent leaf bases.
The trunk of this species is up to 10 m tall and about 1 m in diameter-the topmost fronds reach up a further 10 m-and sheathed in persistent leaf bases.
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