阔叶为小薜科植物阔叶十大功劳Mahonia bealei (Fort.) Carr. 的叶， 全年可采摘，晒干。
然而，在一些地区，阔叶落叶树木形成了林木线。
There are some areas, however, where broadleaf deciduous trees form the timberline.
它们显然更偏向于树底下有着稠密的灌木丛的阔叶树森林。
They clearly prefer hardwood forests with dense shrubs, bushes underneath the trees.
孢粉表明温带气候地区温暖凉爽，表明落叶林和阔叶林的分布广泛。
Sporopollen implies warm-cool and moist climate of temperate zone, suggesting wide distribution of deciduous and latifoliate forests.
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