What is the difference between 楊 and 柳 which both mean "Willow"


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?




`柳` やなぎ リュウ:

>   * Used for willows which have their branches hanging down including
> [`しだれやなぎ`](http://ja.wikipedia.org/wiki/%E3%82%B7%E3%83%80%E3%83%AC%E3%83%A4%E3%83%8A%E3%82%AE).
> Can refer more broadly to the tall deciduous trees in the willow family and
> as a general term for shrubs as well according to Kanjigen.
>   * Has a frequency of 1169/2501 and is classified as a general usage Kanji
> according to Kanjidic.
>

`楊` かわ やなぎ ヨウ:

>   * Used for willows which have their branches going upwards including
> `かわやなぎ` and
> [`ねこやなぎ`](http://ja.wikipedia.org/wiki/%E3%83%8D%E3%82%B3%E3%83%A4%E3%83%8A%E3%82%AE)
> according to Kanjigen.
>   * Has a frequency of 1815/2501 so is less common and is classified as a
> `人名用{じんめいよう}` Kanji for use in people's names according to Kanjidic.
>




`柳` やなぎ リュウ:

>   * Used for willows which have their branches hanging down including
> [`しだれやなぎ`](http://ja.wikipedia.org/wiki/%E3%82%B7%E3%83%80%E3%83%AC%E3%83%A4%E3%83%8A%E3%82%AE).
> Can refer more broadly to the tall deciduous trees in the willow family and
> as a general term for shrubs as well according to Kanjigen.
>   * Has a frequency of 1169/2501 and is classified as a general usage Kanji
> according to Kanjidic.
>

`楊` かわ やなぎ ヨウ:

>   * Used for willows which have their branches going upwards including
> `かわやなぎ` and
> [`ねこやなぎ`](http://ja.wikipedia.org/wiki/%E3%83%8D%E3%82%B3%E3%83%A4%E3%83%8A%E3%82%AE)
> according to Kanjigen.
>   * Has a frequency of 1815/2501 so is less common and is classified as a
> `人名用{じんめいよう}` Kanji for use in people's names according to Kanjidic.
>

