The under-appreciated Crassula ovata, jade plant, reportedly native to South Africa and ridiculously easy to grow in our mild dry climate. It tolerates lots of inattention. The highlight every year: in the late winter and early spring, it flowers. I usually think of the bloom as a modest thing--the flowers burst out of tiny buds about the size of a match-head and I don't think the individual flowers are even half an inch in diameter. But there's so much to all these little organisms when you stop and look up close.