I've come across two kanji, which are both read やなぎ
and both mean "willow".
From what I've found out so far, 柳
has an On'yomi of リュウ
and it seems to mean more "things with the qualities of a willow"; while 楊
has an On'yomi of ヨウ
and means the type of tree. That being said it also seems to be a name element.
Can anyone confirm this or shed some more light on the subject?