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aerial root
Aerial roots are roots above the ground. They are almost always adventitious. They are found in diverse plant species, including epiphytes such as orchids, tropical coastal swamp trees such as mangroves, the resourceful banyan trees, the warm-temperate rainforest rātā (''Metrosideros robusta'') and pōhutukawa (''M. excelsa'') trees of New Zealand and vines like Common Ivy (''Hedera helix'') and poison ivy (''Toxicodendron radicans'').
== Types of aerial roots ==
This plant organ that is found in so many diverse plant families has different specializations that suit the plant habitat. In general growth form, they can be technically classed as ''negatively gravitropic'' (grows up and away from the ground) or ''positively gravitropic'' (grows down toward the ground).〔(UCLA Botany glossary page - Roots )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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