UNSYMMETRICAL COTYLEDONS 35 



other hand, the inequality in the two sides of the cotyledon 

 is due to the inequality between the two sides of the seed 

 (fig. 69). 



In Heritiera macrophylla the cotyledons fill the seed, which 

 conforms to the shape of the carpels, and the fact that these 

 are somewhat unequal-sided renders the seed and consequently 

 the cotyledons so likewise. 



In the Lupines the seeds are obliquely oblong, compressed 

 laterally, and without endosperm, the embryo being large, 

 fleshy, yellowish, and occupying the whole seed. It is doubled 

 on itself, and the cotyledons are folded along the radicle, 

 which nearly equals them in length, with the smaller halves 

 turned towards the radicle, and in such a manner that they 

 and the radicle together occupy one half of the seed, and 

 about equal the larger halves of the cotyledons, which fill the 

 other. 



In Triphasia the inequality is due, partly at any rate, to 

 a different cause. The seeds are oval, somewhat flattened, 

 especially on the ventral aspect. The embryo is large, and 

 occupies the whole seed. The cotyledons are very unequal in 

 size, and the smaller one is more or less enclosed in the larger. 

 But, in addition to this, there are often, indeed generally, two 

 and sometimes three embryos in each seed ; these differ in 

 size, and the smaller ones often intrude more or less on one of 

 the cotyledons belonging to the larger ones. 



CKENATE COTYLEDONS. 



The vast majority of plants have the edges of the coty- 

 ledons entire. There are some few, how- 

 ever, in which they are more or less cre- 

 nate, as for instance in Cordia subcordata 

 (fig. 33). 



In this species the embryo occupies the 

 whole of the ovoid-conical seed. There is no p IG- 70. Embryo of 

 endosperm, and the cotyledons, in order to c dia ^bcordata, 

 occupy the whole space, are longitudinally 

 folded (fig. 70), thus giving rise to the crenations on the margin. 



