244 



PHYLLODY 



daisy, and many othef composites. In the * Gardeners* 

 Chronicle,* 1852, p. 579, is figured a dahlia in which the 

 bracts of the involucre and the scales of the receptacle 

 had all assumed the forms texture, and venation of leaves.^ 



Fig. 128. DaMia. Scales of receptacle leafy. 



In TJmhellifercB the substitution of leaves for involucral 

 bracts is not infrequent. It has been observed among 

 other plants in Angelica Bazoulzii, Garum canii, Daucus 

 Carotaj &c. The scales of the hop {Humulus Lupulus) 

 not infrequently manifest this change, as do also the 

 bracts of many amentaceous plants, e. g. in the male 

 catkins of the walnut, the female catkins of the alder,^ 

 of some willows,'' &c. The bracts of some Euphor- 

 hiacece., as E. pusilla, E. Lathjris, E. Cyparissias, have 

 been observed to undergo a similar alteration.* 



For instances of similar changes in Composites, see De Candolle, 

 ' Prod.,' t. vi, p. 571, Centaurea Jacea ^hyllocepliala. Clos, ' Ann. Sc. 

 Nat.,' ser. iii, torn, xvi, 1851, p. 41. ' Science Gossip,' 1865, p. 104, &c. 



^ Kickx, Bull. Acad. Belg..' t. xviii, part 2, p. 288. 



' "Weber, ' Verhandl. Nat. Hist. Vereins. f. Preuss.,' &c., 1860, p. 381. 



* Weber, loc. cit. 



