This is a cross between paperwhites and a yellow species of fall blooming narcissus.  It produces a profusion of pale yellow flowers flowers (picture is representative, not exact).   Since it is not officailly registered, the hybridizer is calling it aw-pc 27.  The number 27 in the number of bulbs it had multiplied into when he discovered it.  The bulb had apparently been tossed into a rubish heap accidentally but somehow managed to thrive were other bubs would not have survived.

It can be forced indoors like a standard Paperwhite.  When grown outdoors Tazettas are some of the first Narcissus to bloom every autumn.  It is a great naturalizer's in zones 8-10. 

Large bulbs are not machine sorted, but I would estimate most of them are 16+ cm in circumferance.