372 



GYMXOSPERMS 



As long ago as 1872, Strasburger^'''' worked out the early de- 

 velopment of the bract, the two scales, and the sporangiophore of 

 Ephedra campylopoda (hg. 352). From his figure it is obvious that 

 the sporangiophore, bearing the two scales, is in the axil of a bract. 



.r^ 



Fig. 354. — Ephedra viridis: part of ovulate plant; X 2. — From an unpublished draw- 

 ing by Dr. S. Flowkrs. 



The most complete account of the life-history is by Land,""- "" who 

 studied abundant material, both living and fixed, of E. trifurca, 

 through spermatogenesis, oogenesis, fertilization, and some stages 

 in the embryogeny (fig. 353). The bract appears close to the stem 



