The Arecaceae are a botanical family of perennial lianas, shrubs, and trees commonly known as palm trees. (Owing to historical usage, the family is alternatively called Palmae.) They are flowering plants, the only family in the monocot order Arecales. Roughly 200 genera with around 2600 species are currently known, most of them restricted to tropical, subtropical, and warm temperate climates. Most palms are distinguished by their large, compound, evergreen leaves arranged at the top of an unbranched stem. However, palms exhibit an enormous diversity in physical characteristics and inhabit nearly every type of habitat within their range, from rainforests to deserts.