Iris hartwegii subspecies hartwegii. Photographed April 30, 1990 along Forbestown Road, Plumas National Forest east of Oroville, Butte County, California. ©1990 Arthur H. Bazell, M.D. [Original in CalFlora - http://elib.cs.berkeley.edu/photos/ ]. Note the very short floral tube (between the petal base and the ovary). Yellow-flowered Iris macrosiphon, in the same general region, has a 2-3 inch long floral tube.