124 



Speaking of the embryo in Eucalyptus, Bentham says : 



" Embryo with broad cordate 2-lobed or bipartite cotyledons, folded over the straight radicle, but 

 otherwise flat." (B.FL, iii, 185.) 



" The embryo in Eucalyptus appears always to have the cotyledons folded over the radicle, but 

 varies much in the shape of the cotyledons, very broad or rather narrow, entire, cordate, 2-lobed or 

 2-partite, and in the comparative length of the radicle, and these differences are very likely of specific 

 constancy ; but there are but two or three species in which I have been able to examine the embryo taken 

 from several specimens, and not many where I have had perfect seeds enough to spare more than one or 

 even a single one for dissection. I have, therefore, thought it very unsafe to rely upon any of the 

 modifications observed for specific distinction." (p. 188.) 



Mueller (" Eucalyptographia ") merely says : " Embryo of amygdaline con- 

 sistence," and figures it as follows : — 



E. buprestium, 10 (in situ); 11, cotyledons slightly unfolded, laying free part of the radicle; 12, 

 transverse section of embryo. 



E. calophylla, 11, embryo; 12, cotyledons unfolded ; 13, transverse section of embryo. 



E. capitellata, 10, embryo; 11, the same uncoiled. 



E. cladocalyx (corynocalyx), 10, embryo; 11, the same unfolded. 



E. cosmophylla, 11, embryo in its natural position ; 12, transverse section of an embryo ; 13, embryo, 

 with cotyledons unfolded. 



E. crebra, 10, embryo. 



E. diversicolor, 13, embryo; 14, cotyledons unfolded, to exhibit the radicle. 



E. erythrocorys, 10, embryo. 



E.ficifolia, 11, embryo in situ; 12, embryo uncoiled; 13, transverse section of embryo. 



E. gamophylla, 11, 12, 13, as in E.ficifolia. 



E. globulus, 11, 12, 13, as in E.ficifolia. 



E. goniocalyx, 11, embryo. 



E. leucoxylon, 13, embryo. 



E. marginata, 11, embryo in situ; 12, embryo uncoiled. 



E. megacarpa, 12, embryo in situ; 13, cotyledons partly spread out, to exhibit the radicle; 14, 

 transverse section of embryo. 



E. miniata, 10, embryo in situ; 11, side view of cotyledons; 12, transverse section of embryo. 



E. obliqua, 10, embryo; 11, the same partly uncoiled. 



E. Sieberiana, 11, embryo uncoiled; 12, embryo in its natural position. 



E. W atsoniana, 11, embryo in situ; 12, transverse section of the same; 13, embryo unfolded, to show 

 the cotyledons and radicle. 



Lubbock " On Seedlings," (1892, p. 524) says: 



' The embryos of species of Eucalyptus coming under my notice are remarkable for the way in which 

 the cotyledons are deflexed and become folded or coiled round the radicle. The latter is straight in 

 E. globulus (fig. 338, not reproduced), as are the petioles for part of their length, while the upper portion is 

 bent at right angles to reach the base of the cotyledons. The whole length of the seed is occupied by the 

 rstdicle, the straight portion of the petioles, and the real length of the cotyledons, which is not great. The 



