FORMS OF COTYLEDONS 



17 



Asystasia 1 (fig. 16), Ehus typhina (fig. 17), and Flax (Linum) 

 (fig. 19). We find some species with narrow cotyledons and 

 broad leaves, as Menispermum (fig. 18), while in others the 

 cotyledons are broad and the leaves narrow, as in an Australian 

 Flax (Linum monogynum) (fig. 19), Hakea (fig. 21), and the 

 Pink (Dianthus) (fig. 22), &c. 



In some cases we find instances of broad and narrow 

 cotyledons in the same family, as in Chickweed (fig. 23) and 

 Pink (fig. 22), belonging to the Caryophyllaceae ; sometimes 

 even in the same genus, as Gallium saccharatum (fig. 24) and 

 Galium Aparine (figs. 91 and 92). 



FIG. 33. Seedling of Cordia sub- 

 cordata. Half nat. size. 



FIG. 34. Seedling of Pelargonium 

 australe. Half nat. size. 



In some cases the two cotyledons are unequal, as in the 

 Mustard (fig. 3), Cabbage, Eadish, Cereus (fig. 63), Pachira, 2 

 &c. : in some the two halves of each cotyledon are unequal, 

 as in the Geranium (fig. 25) ; or they are otherwise unsym- 

 metrical, as in the Lupine, Laburnum (fig. 26), Clitoria (fig. 

 27), Schinus (fig. 28). Sometimes they are sessile, as Acer 

 (fig. 9), Hakea (fig. 21), Laburnum (fig. 26), &c. ; sometimes 



1 In Asystasia coromandeliana there is an interesting peculiarity. The first 

 pair of leaves of each branch, or at any rate of the lower branches, approximate 

 to the form of the cotyledons. 



2 As described by Mr. Lynch (Journ. Linn. Soc. vol. xvii. p. 147). 



C 



