any species reproduce only asexually?

[Tristan]

Hello,

I have been debating with a friend about whether or not any plants reproduce
only asexually, or whether all plants have some mechanism of sexual
reproduction.  Our research has unveiled many forms of asexual reproduction,
but there is usually an implication that the same plants also reproduce
sexually.  Are there any species anyone knows of that reproduce only
asexually?

Thanks