Irish Book/Agave multifilifera

Hi All and especially the Irishes.  I just received my copy of their book 
(via mail order source) and I am very impressed with it.  Well done I say!  
I do have one question already though.  The photo of Agave multifilifera 
(Plate 24), is that really multifilifera?  Or did it get mixed up and is 
really Yucca glauca, or such?  The reason I ask is that I saw a pretty good 
sized multifilifera at Greg Starr's and it did not have anything like the 
semblance of a trunk.  Since agaves are monocarpic I am surprised that 
multifilifera would reach this size (the size of the plant on Plate 24) and 
not have already flowered.  Puzzlement indeed.  Help Mary and Gary!

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