Gnetophytes

Definition

Gnetophytes are a group of gymnosperms that include three distinct genera: Gnetum, Ephedra, and Welwitschia. They are unique among gymnosperms due to their vessel elements in the xylem and other angiosperm-like features.

5 Must Know Facts For Your Next Test

1. Gnetophytes consist of three genera: Gnetum, Ephedra, and Welwitschia.
2. Unlike most gymnosperms, gnetophytes have vessel elements in their xylem.
3. Gnetum species are often tropical trees or vines.
4. Ephedra species are commonly found in arid regions and some produce ephedrine alkaloids.
5. Welwitschia mirabilis is a desert plant with only two leaves that grow continuously throughout its life.

Review Questions

• Name the three genera that make up Gnetophytes.
• What feature do gnetophytes share with angiosperms?
• Where would you typically find Ephedra species growing?

Related terms

Gymnosperms:

Seed-producing plants that do not form flowers or fruits.

Angiosperms: Flowering plants that produce seeds enclosed within a fruit.

Xylem:

The vascular tissue in plants responsible for the transport of water from roots to shoots and leaves.