526 ON SEEDLINGS 



Geranium. The long petioles show a transition to a still 

 more remarkable type occurring in E. marginata (fig. 343), in 

 which the hypocotyl is subterranean and extremely short, 

 while this deficiency is compensated for by the length of the 

 petioles. The lamina is obcordate, cuneate and trinerved, 

 resembling a Brassica. A striking departure from the common 

 type occurs in E. calophylla (fig. 344) having reniform-orbi- 

 cular, incipiently emarginate, foliaceous cotyledons of great 

 size. The three nerves are copiously branched, the lateral 

 ones again having three main divisions. 



They all agree in having the primary leaves opposite and 

 entire, but these differ slightly in form. Those of E. Globulus 

 are linear- lanceolate ; of E. rostrata, E. cordata and E. 

 leucoxylon, lanceolate; of E. stellulata, oval; of E. coccifera, 

 E. marginata, and E. ficifolia, ovate; of E. occidentalis, ob- 

 long ; and of E. calophylla, cordate, covered on both surfaces 

 with crystalline glands. The primary leaves of many indi- 

 vidual specimens of E. ficifolia are more or less distinctly 

 alternate. 



Amongst the species with aerial cotyledons are some which 

 must be considered exceptions to the above-mentioned types. 

 Khodomyrtus tomentosa has oblong-ovate, obtuse, shortly 

 petiolate, penninerved cotyledons which are much longer 

 than the first two pairs of roundly ovate leaves. A most re- 

 markable case occurs in a species of Lecythis, seeds of which 

 were sent to Kew from Trinidad under the name of L. Ollaria 

 (fig. 349). The cotyledons are palmately five-nerved and 

 seven- to nine-lobed with finger-like, bluntly pointed seg- 

 ments. The first five or more leaves are lanceolate, finely 

 serrated and much smaller (especially the first two) than the 

 foliaceous persistent cotyledons. 



In a third type the cotyledons where present are sub- 

 terranean and shortly petiolate as in Eugenia bracteata (fig. 

 346). The embryo of Lecythis Zabucajo (fig. 348) consists 

 of a solid piece while still in the seed, to the Ulterior of which 

 it strictly conforms. It is narrowly ellipsoid or fusiform, and 

 is evidently homologous with the hypocotyl which has become 

 thickened and fleshy in this remarkable way in order to con- 

 stitute a storehouse of reserve-material. By remaining in the 



