EUPHORBIACE.E 471 



compressed, rather truncate at either end, and obliquely so 

 at the hilum where a semi-globular arillode is situated. The 

 cotyledons are rather wider than in the last case and much 

 longer than the radicle. The latter condition is again re- 

 versed in E. Peplus in which the radicle is twice as long 

 as the cotyledons. The latter are, however, much wider 

 and oval with their backs to the placenta as in the three 

 previous cases. The seed is oblong, bluntly ridged longi- 

 tudinally, deeply pitted with circular depressions, and a' 

 long furrow on each side of the raphe on the ventral aspect. 

 The broadly oval cotyledons of this species form a con- 

 necting link with the next group. 



The seed of Euphorbia splendens is globose-oblong, tumid, 

 and covered all over with small warts or elevations. The 

 embryo of this species falls considerably short of the endo- 

 sperm. The cotyledons are plano-convex, suborbicular, and 

 nearly as wide as the endosperm. The seed of E. platyphylla 

 is subglobose and the embryo very similar to that of the 

 last, but the cotyledons are relatively longer, and some- 

 what exceed the radicle. The seed of E. Lagascse is oblong, 

 terete and rather truncate at either end. The cotyledons 

 are broadly oblong, and longer than the radicle. The seed 

 of E. macrorhiza is oblong, compressed, elliptical in trans- 

 verse section, and truncate at both ends. The cotyledons 

 are broad, short, oblong and about equal to the radicle in 

 length. 



The third type is very distinct from either of the foregoing 

 as the cotyledons almost equal the seed, both in length and 

 width, nearly dividing the endosperm into halves as occurs 

 in Sterculia. A good example is that of Jatropha Curcas 

 which has broadly oblong cotyledons deeply auricled at the 

 base and almost completely enclosing the short stout radicle. 

 They are radiately five-nerved from the base, with strong, 

 branching nerves. The endosperm shrinks when dry, and 

 the cotyledons receding with it, a hollow space is left between 

 them. This peculiarity is even more marked in Hevea 

 brasiliensis, where the endosperm is more nearly if not quite 

 divided in half. 



The cotyledons are oblong, slightly tapered to the base in 



