MIMICRY. 



333 



the species are mostly South American. This is 

 represented by Heteropterys laurifolia (fig. 74) ; and- 

 yet again in the Phytolaccacees, the same kind of 

 samara is found in at least two genera, of which 

 we have illustrated Gallesia goranema and Seguiera 

 fioribunda. These four illustrations are from three 

 natural orders, all separate from each other and from 

 the maples, and yet, not only is the size and form 

 the same, but also the veining in the wings. So 

 deceptive is the resemblance between these fruits, 

 that only dissection and analysis could determine 

 one from the other. 



Another type of 

 samara is that of the 

 elm, in which the seed 

 occupies the centre, 

 surrounded by a wing. 

 Our common forms 

 are those of the com- 

 mon elm (JJltnus cam- 

 pestris) and the wych 

 elm {JJhnus montana), 

 the latter being the 

 largest. This form of Fi S- 75-— Samara of (a) Ulmuscam- 

 r . . . . , . ■bestris, (b) Ulmus montana, (c) 



fruit 15 imitated in p iel ea trifoliata.id) Hircea. 

 Ptelea trifoliata, a 



tree of the Rutacece, and in a species of Hircea, one of 

 the Malpighiacetz. 



