POSITIVE DEDOUBLEMENT. 



91 



In Gephalotaxus there was observed, on the slightly 

 elongated floral axis, which usually in its normal state 

 produces a single pair of ovules only, an extra pair 

 formed above ; but one of these is usually in the form 



o 



a b 



Pig. 100. — Cephalotaxus dnipacea. a, The second whorl consists of 

 one ovule only b, Flower with second whorl of ovules (oif) 

 alternating with the first whorl of metamorphosed ovules (ov l ). 

 br, bract. Diagrams. 



of a small foliar organ ; sometimes, when the two 

 normally-situated ovules are replaced by similar foliar 

 organs, the ovule occurring in the second whorl is the 

 only one in the flower (fig. 100). Celakovsky is doubt- 



Fig. 101. — Trifolium repens (Dutch Clover). Flower with two or more 

 extra carpels (cp). stp, stipules. 



less correct in regarding, on comparative grounds, the 

 Taxaceous ovule as representing a carpel reduced to 

 one of its ovules ; so that in these abnormal flowers 

 there are two whorls of carpels represented. 



In those plants which have normally a reduced 



