Structure of Seed of Ephedra

Structure of Seed of Ephedra:-
- Longitudinal section of the seed shows that it consists of a dicotyledonous embryo in the centre. This embryo is situated at the tip of the elongated suspensor and remains embedded in the endosperm. The nucellus is consumed during the development of embryo and persists as a nucellar cap at the micropylar end of the seed.
- The seed is enclosed by the seed coat which consists of two separate layers derived from the two envelopes. At the time of maturity, the subtending bracts of the megasporangiate strobilus become thick and fleshy and form an additional covering around the seed e.g.,E. foliata.