DICOTYLEDONOUS EMHKYO. 



287 



become lobed, as in the Walnut and the Lime (fig. 510), where the 

 cotyledon, c, has five lobes; or petiolate, as in Geranium molle (fig. 

 oil p) ; or auriculate, as in the Ash (fig. 512 6). Like leaves in the 

 bud (see Vernation, ^[ 184), cotyledons may be either applied directly 

 to each other (fig. 509), or may be folded in various ways. In the 

 Almond (fig. 500) they lie in the direction of the axis. In other cases 

 they are folded laterally, condupKcate (fig. 513); or from apex to base, 



reclmate (fig. 205 a); or rolled up laterally, so as partially to embrace 

 each other, convolute (fig. 514); or rolled up like the young fronds of 

 ferns, drcinate (fig. 515). In these cases, both cotyledons follow the 

 same direction in their foldings or convolutions; but, in other in- 

 stances, they are folded in opposite directions, resembling the equitant 

 (fig. 205 m) and semi-equitant (fig. 205 n) vernation. 



601. The radicle may be either straight or curved, and, in particular 

 instances, it gives a marked character to the seed. Thus, the divisions 

 of the order Cruciferae are founded on the relative position and folding 

 of the radicle and cotyledons. In the division Pleurorhizece (?r?i svod, side, 



Fig. 509. Embryo of Ricinus communis taken out of the seed (see fig. 48-3), and cut trans- 

 versely. The two halves are separated so as to show the two cotyledons, e, applied to each other. 

 r, Radicle. 



Fig. 510. Embryo of the Lime, r, Radicle, c. One of the divided or palmate cotyledons. 



Fig. 511. Embryo of Geranium molle. r. Radicle, c, Cotyledons attached to the collar by 

 a stalk or petiole, p. 



Fig. 512. Embryo of the Ash. r. Radicle, c, One of the cotyledons, o o, Auricular appen- 

 dages to the cotyledon. 



Fig. 513. Embryo of Brassica oleracea, Cabbage, r, Radicle, c, Cotyledon. 1. Entire embryo, 

 2. Embryo cut transversely, showing the cotyledons folded on the radicle or conduplicate. The 

 radicle is dorsal, or on the back of the cotyledons. 



Fig. 514. Embryo of Punica Granatum, Pomegranate, cut into two halves. The upper half 

 removed to show the convolute cotyledons, r, Radicle. 



Fig. 515. Circulate embryo of Bunias oiientalis. 



