This is the likelyhood that the average person is going to encounter this plant in cultivation. There are 6 degrees listed here from most common to least common as: Common Worldwide, Common Locally in Some Areas, Unusual in Collections, Rare, Extremely Rare, and Not in Cultivation. This is a general guide to help ID and by no means exact or typical of all situations. The idea is to help narrow down the list of possibilities when trying to ID a plant. If the plant was purchased at WalMart or another large garden center, plants not listed as "Common Worldwide" or "Common Locally in Some Areas" can be ruled out. On the other hand, a visit to a botanical garden or a serious collector's house would mean all are possibilities except "Not in Cultivation" -