Viewing post #775258 by JRsbugs

First, it's a good idea to check if both names are valid. They are according to theplantlist.

http://www.theplantlist.org/tp...

http://www.theplantlist.org/tp...

Next, try to search for a comparison. I found this ....

http://www.cactus-art.biz/sche...

Haworthia fasciata on the above site is given as a synonym for Haworthia attenuata forma variegata ..

http://www.cactus-art.biz/sche...

Different cultivars ..

http://www.cactus-art.biz/sche...

Being a synonym of a plant doesn't mean a species is the same as another, it can mean that a plant has been wrongly identified at some point as one which looks similar but is in fact a different species and has been found later to be another distinct species.

More research digs up some info:

A number of different species are out there, but the one I see probably the most often is H. attenuata. This is often called H. fasciata, but apparently the actual H. fasciata is pretty rare (see Palmbob's comment here), and if you're sold one that's being called either name, it's really probably attenuata.

http://plantsarethestrangestpe...

From palmbob's comment on the link given in the above link:

This is a very attractive Haworthia, but often confused with H. attenuata.

Haworthia fasciata is actually a fairly rare plant and 99% of the 'Zebra Haworthias' sold commonly around the world are actually Haworthia attenuatas.

H. fasciata has very smooth leaves on the inside/upper surface while H attenuata varieties all have a rougher to knobby upper/inside surface (though far less knobby or rough than the outside/lower leaves).

Careful examination of both these plants side by side can still leave one scratching one's head, though, as both are quite variable and can be really hard to tell apart but by Haworthia experts (which I am not).