The leaves of what plant genus are the source of the compound ephedrine, which is used in medicine as a potent decongestant and is similar to amphetamines?

• Correct Answer: additive
• Stimulant
• dietary
• ephedra

Explanation: years. The genus Ephedra is represented in North America in dry areas of the southwestern United States and Mexico (Figure 14.23). Ephedra’s small, scale-like leaves are the source of the compound ephedrine, which is used in medicine as a potent decongestant. Because ephedrine is similar to amphetamines, both in chemical structure and neurological effects, its use is restricted to prescription drugs. Like angiosperms, but unlike other gymnosperms, all gnetophytes possess vessel elements in their xylem.

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