What is the difference between ephedra and ephedrine?

Ephedra Exist in around 40 plants around the world.

Some of them like Ephedra Sinica or Cordifolia contains Alkaloids.

Between 40 and 90% of the Alkaloids is Ephedrine.

Ephedra plants like Nevadensis or Viridis only contains Ephedra and not Ephedrine.