Further Studies on Anomalous Dicotyledonous Plants. 



By D. M. Mottier. 



(Abstract.) 



The studies reforred to deal with the development of the embryo 

 with special reference to the origin of the cotjiedous in Actcu albit, 

 Stylopl'.oruiii diihyUum and HaiKjvimty'Ki canadensis. In the origin of the 

 cotyledons all three species show, in varying degrees, the distinguishing 

 characteristics of typical anomalous dicots. In each the embiyo be- 

 comes pear-shaped before any indication of the cotyledonar primordium 

 is apparent. The primordium of the cotyledons uoav appears as an 

 almost complete, circular, ridge-like outgrowth from the margiii of the 

 broadly truncated end of the emliryo. With the further growth oi' this 

 ridge a bifurcation soon appears at a point exactly opposite the pri- 

 mary cleft of the primordium, so that the tAvo young cotyledons, wliieh 

 may cr may not be of the same size, seem to represent two s;'pa;are 

 and opposite lobes of the distal end of the embryo with one of the 

 clefts a little deeix r than the other. ^In some cases (Styloplioruni) the 

 two cotyledons seem to arise as separate and independent outgrowths, 

 but a little later their common base grows faster on one side than 

 on the other, and in this manner the two clefts or bifurcations become 

 unequal in depth. 



It is important to note, however, that in embryos of different indi- 

 viduals of the same species tlie Mnumalous character is much more 

 strongly marked than in others. 



On the Germination of Certain Native Weeds. 



By Stanley' Coulter. 



(By title.) 



