[rs79]

Looks like wendtii to me. They can look very different depending onhow and where they're grown. The same plant can have small leaves all clumped tightly or it can be a foot tall. They can be green or brown. It all depends on light and nutrients.

They might be different species but it's not impossible they're all the same plant.

 

[rs79]

They could indeed be. Now, if they're not the last one is Xwillisii the rest are brown and green forms of WEN.

But! If any of the smaller green ones send out long long runners instead of making lots of new plants arond the base, it might be undulata.

The brown ones INO are unquestionably the brown form of WEN.