380 



BENNETTITALES 



[CH. 



seem, however, that in most cases the flowers were bisexual 1 

 (fig. 513). A remarkable feature is the enormous number of 

 flowers on a single stem; in Cycadeoidea Dartoni 2 , 54 cm. 

 long and 35 cm. broad, 500 600 flowers were counted on one 



FIG. 513. Cycadeoidea. Restoration of an unexpanded bisporangiate strobilus 

 with some of the hairy bracts removed. Compare Cycadeoidea dacotensis, 

 figs. 529, 530. (After Wieland; ca nat. size.) 



side. On the other hand the large stem of C. gigantea (fig. 536) 

 shows no flowers. All the flowers on a single trunk are approxi- 

 mately in the same stage of development: it would seem, as 



1 The flowers are frequently described as protandrous but, as Dr Scott pointed 

 out to me, we have no definite evidence on this point. 



2 Wieland (II 2 ) p. 134; Coulter and Chamberlain (10) p. 67, fig. 55. 



