Agaves seen in cultivation in Tucson

I went out to the Arizona-Sonora Desert Museum outside of Tucson last 
Friday with my two young sons.  They've really improved their signage 
out there on plants since I was last there several months ago.  Lots 
of people that day! from 4 Canadian Provinces and at least 25 states 
judging by the license plates!

Anyway, whilst there I noticed some interesting agaves.  One was a 
species called Agave toumeyana var. oenna (sp.?).  A real miniature.  
Anyone know some basic info on this taxon?  Also seen in container 
near the restaurant was a handsome hybrid labeled Agave x 'Edward 
Hummel'.  Anyone know of this one and the parents?

Also I am a bit confused about two agaves which seem to me to be very 
similar looking.  I refer to Agave ocahui and A. pelona.  Maybe I 
have just seen alot of mislabeled plants of one or the other.  
Nonetheless ocahui seems to be a small version of pelona.  Any sense 
to this perception?

Thanks, Breck


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