Ricinus communis, the Castor bean plant. Photos taken early morning...
This vigorous shrub requires full sun, lots of water, and lots of fertilizer. In summer it should be placed outdoors, where it may grow as much as 10 feet in a season. Watch out for the seed pods in fall, as they are extremely poisonous. According to Wikipedia, it takes 5 castor oil seeds to kill a sheep, but 80 to kill a duck. Who figures these things out? Mad scientists who are bored on sabbatical?
This isn't a particularly common houseplant, and it certainly can achieve an ugly, leggy habit indoors without proper care. Still, I couldn't resist that crazy Quinacridone-violet color. It's as lovely as a painting, and I can't wait for it to explode with growth this spring.