24 ON SEEDLINGS 



obtuse-oblong, and approximately following the general out- 

 line of the seed. In Hippophae (fig. 14) we have a somewhat 

 similar case ; but the cotyledons are fleshy and occupy almost 

 the whole of the seed (fig. 53). In Euonymus, again, the seed 

 is obovoid, slightly compressed laterally. The endosperm is 



PIG. 51.Phaseolus multiflorus. Section 

 of seed parallel and vertical to cotyle- 

 dons, three-fourths nat. size : a, a, 

 auricles ; ar, arillode. 



FIG. 52. Ricinus sanguineus. 

 A, longitudinal section of 

 seed, nat. size. B, transverse 

 section of seed, nat. size. 



abundant, fleshy, firm, and white, entirely surrounding the 

 embryo. The embryo is straight, flat, central, pale green, 

 extending very nearly from one end of the seed to the other. 

 In the Flax the seed is ovate, obliquely pointed, glabrous, 

 plano-convex, laterally much compressed, placed edgeways on 



FIG. 58 Hippophae rhamnoides. 

 A, longitudinal section of seed, 

 x4. B, transverse section of 

 seed, x 4 : d d, depressed line. 



FIG. 54. Moscharia pinnatifida. 

 A, longitudinal section of seed, 

 x 8. B, transverse section of 

 seed, x 8 : a a, auricles. 



the placenta, and the cotyledons lie parallel to the flattened 

 axis of the seed. In other cases the seeds are still more 

 flattened, as in Ailanthus, Passiflora, Cobsea, Stephanotis, &c. 

 The Composite generally have narrow cotyledons. In 

 Moscharia, however, they are somewhat broader, the seed (fig. 

 54) being obovoid, with the cotyledons lying the broad way. 



