Gnetophyta live in tropical and desert environments.
- Welwitschia can absorb water through structures on its large leaves.
- Gnetum species are tropical trees or vines.
- Ephedra (Mormon Tea or Ma Huang) is a desert shrub.
Ephedrine extracts have been used as a diet pill,
but carries cardiovascular risks that may have led to deaths including
Minnesota Viking Korey Stringer (2001) and Baltimore Orioles pitcher Steve Bechler (2003).