WAL

C. walkeri

WEN

C. wendtii

brown   green   green_gecko   tropica   Mi_Oyo

WIL

C. x wilissii

lucens

The "old aquarium nevillii" is really wilissii - and are naturally occuring hybrids. There are many forms of this plant, for example the old "C. lucens" - this is not a sepcies, just another form of WIL.