Looks like Yucca aloifolia.
http://www.google.com/imgres?q=yucca+aloifolia&hl=en&sa=X&biw=1920&bih=910&tbm=isch&prmd=imvns&tbnid=17CgNW7OUklKAM:&imgrefurl=http://luirig.altervista.org/photos/y/yucca_aloifolia.htm&docid=g-Tdd8IC285GXM&imgurl=http://luirig.altervista.org/cpm/albums/bot-hawaii32/16240-Yucca-aloifolia.jpg&w=600&h=450&ei=zqKoToqfIM-ltwfbnLH_Dw&zoom=1&iact=rc&dur=615&sig=115308009991202734321&page=2&tbnh=142&tbnw=189&start=50&ndsp=39&ved=1t:429,r:37,s:50&tx=165&ty=107
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