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Strange plant-- Help ID?


Greetings,

I've been trying to remember the name of a plant that is quite fascinating
and fits well with Medit-gardens, perhaps someone knows what I'm referring
to?

The growth habit is very familiar to a Hawaiian Silversword (Agyroxiphium
sandwicense), having an inflorescence that erupts from a central crown of
yucca-like leaves. The floral spike is usually red, and quite large.
Supposedly the plants take between 3 and 5 years to mature to flowering
size, and the total height of the plant and flower can exceed 10 feet.
Foolishly, I wasn't taking notes during the program where I saw photos of
this plant, but the name sounded like Xantheum or something. It's
evidently marignally hardy in Portland and Seattle (Pacific NW, uda zone
7-8). 

Does this plant description ring any bells for anyone?

Thanks in advance,

Mark
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