GB0S8 ANATOMY OF THE ANQIOSPEBMS. 319 



The embryo occupies either the whole of the seed-cavity, in exal- 

 huminous seeds (Figs. 333 and 334), or it lies in or in contact with 



1 2 3 



Fig. 232.— Albumlnoua (endospermous) seeds: ], of Moonseed, 3, of 

 Chenopodium, each with a curved embryo ; 3, of Marsh-marigold (Caltha) 

 with minute straight embryo. 



the endosperm, in the albuminous seeds (Pig. 333). It is straiglit — 

 e.g., the pumpkin ; or variously curved and folded — e.g., in Ery- 

 simum, where the cotyledons are incumbent, i.e., with the little stem 

 folded up against the hack of one of the cotyledons, and in Arabis 

 (Fig. 833), where they si,^e aceumbent, i.e., with the little stem folded 

 up so as to touch the edges of the cotyledons (Pig. 334). 



1 a 



Fig. 223.— Incumbent cotyledons of Erysimum : 1, longitudinal section 

 of seed ; 3, cross-section of seed. 



Fig. 224.— Aocumbent cotyledons of Arabis 

 seed ; 2, cross-section of seed. 



1, longitudinal section of 



