I don't have a picture but we have a cactus at work, about 7 or 8 inches tall, barrel shaped with vertical raised ridges where the spines are. Color is dark dark green...it sprouted flower buds at the very top a few weeks ago and is now blooming. the flowers are pale yellow with deep red centers, the deep red sort of fades into the yellow.

Anyone have any idea what it is? I will try to get a pic on Monday with my digital.