2- Strophanthus Seed
Origin: the dried seeds of Strophanthus kombe, S. gratus and S. hispidus F. Apocyanaceae.
The seeds are lanceolate, the testa is prolonged at the apex into a slender thread-like awn which terminates into a plume of silky hairs. The entire length including the awn is 10-12 cm
K-strophanthoside, K-strophanthin-B and cymarin glycosides and Ouabain (G-strophanthin)
Uses: it resemble digitalis in its effect, cardiotonic, diuretic, raise the blood pressure and it is not cumulative drug.
1- With 66% H2SO4 → emerald green
2- With FeCl3 + H2SO4 → red colour → green colour.