162 



ALTERATION OF POSITION. 



pepluSy and other species, lAnaria md^aris, some Um- 

 belUferw, &c.* 



Adventitious formation of leaves. The term phyllomania 

 has been vaguely appUed both to the production of an 

 imwonted number of leaves and to their development 

 in unusual situations. Under the present heading the 

 latter class of cases are alone included. The extra- 

 ordinary tendency in some Begonias to develop leaves 

 or leafy excrescences from their surfaces is elsewhere 

 alluded to, and is, in reality, a species of hypertrophy 

 or over-luxuriant growth. 



In some flowers where the inferior ovary is supposed 

 to be, in part at least, formed by a dilatation of the 

 top of the flower-stalk, leaves have been met with pro- 

 ceeding from the surface of the ovary or fruit, as in 



Fig. 75. Leaf proceeding from 

 hip of the Rose. 



Fig. 76. Leaves proceeding 

 from the ovary of Nymphcea. 



Crattvgits tayiacetifolla, roses, pears, gooseberries, &c. 

 In a specimen of Nympluea alba I have met with scale- 

 like leaves projecting from the surface of the fruit (or 

 torus?), and which did not appear to be metamor- 

 phosed stamens or styles (fig. 76). 



> Keeper, Enum. Enphorb.,' p. 19. Bemhai-di, ' Linnroa,' vii, p. 561, 

 tab. xiv, f. 1. Wydlcr, " Subcotyled. sprossbildung," ' Flora,' 1850, p. 

 337. Hooker, ' Trans. Linn. Soc.,' vol. xxiv, p. 20 {Wduoitschia). 



