BIGXONIACPLE 335 



than it is at the base or apex of the seed. The embryo is 

 similar to that of the last. 



The fruit of Incarvillea Olgae is a linear, slender and terete 

 capsule. The seeds are pendulous in two rows, and imbri- 

 cated, the uppermost being outermost ; they are also numerous 

 and small. The wing is continuous except at the base. The 

 embryo is central or nearly so, with oval, shallowly emar- 

 ginate cotyledons distinctly auricled at the base. The radicle 

 projects considerably beyond the base of the auricle. The 

 fruit of Eccremocarpus scaber is an inflated capsule ovate- 

 oblong in outline. The seed is orbicular and compressed 

 with the wing continuous round the margin except at the 

 hilum where there is a small notch. That part of the testa 

 in which the embryo is situated is black and obovate in 

 outline. The embryo is broadly obovate or oblate in outline 

 when mature, and the cotyledons are suborbicular and entire. 

 The oblate outline is more developed after germination. This 

 species is one of the few cases occurring in the Order of a 

 one-celled ovary with two parietal placentas. 



Seedlings. About half a dozen different types of cotyledons 

 have come under my notice, but only one of them is of very 

 frequent occurrence, and most of the others are more or less 

 evidently modifications of it. This leading type may be repre- 

 sented by Catalpa Ksempferi (fig. 571). The cotyledons are 

 oblate and deeply bifid with rounded entire diverging lobes. 

 The midrib terminates in the sinus, and represents the real 

 length of the lamina. The lobes are lateral developments 

 dependent upon the shape of the seed, and that again is 

 due to the shape of the capsule which is long, narrow, sub- 

 cylindrical and pod-like. The seeds being inserted on the 

 placenta at right angles to the longitudinal axis of the capsule, 

 they attain a larger size than they otherwise could, by growing 

 in breadth. The cotyledons therefore develop the lateral lobes, 

 which gives them their characteristic form, in order to occupy 

 the additional space afforded them, right and left of their longi- 

 tudinal axis. The cotyledons of C. syringaefolia are divided 

 nearly to the base of the lamina. Those of C. speciosa 

 are not quite so deeply divided, but are otherwise similar 

 and show the venation. They are trinerved from the base, 



