Botanical information on ephedraSeveral articles on the characteristics and growing circumstances of the ephedraplant. There are different types of this plant each with its own habitat, varying from North-America to the Namibian desert to Asia. Also the amount of active substances differs from type to type.
Ma Huang, An Ancient Chinese Stimulant
A very readable introduction which contains all characteristics of the ephedra plant.
A study into the circumstances and the behaviour of the ephedra plant, plus information about the growing and harvesting of this plant.
Clinical Toxicology Review
A botanical and pharmacological analysis of the ephedra plant and its active substances.
Ephedra.Nu, Your ephedra source