244, PHYLLODY 
daisy, and many other 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 allassumed the form, texture, and venation of leaves. 



SS. 



=S¢ 
SA 
qv 

Fie. 128.—Dahlia. Scales of receptacle leafy. 
In Umnbellifere the substitution of leaves for involucral 
bracts is not infrequent. It has been observed among 
other plants in Angelica Razoulzii, Carum carui, Daucus 
Carota, &e. The scales of the hop (Hiwmulus Iupulus) 
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 Huphor- 
biacece, as H. pusilla, EH. Lathyris, EF. 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 phyllocephala. Clos, ‘ Ann. Se. 
Nat.,’ ser. i, tom. xvi, 1851, p. 41. ‘Science Gossip,’ 1865, p. 104, &e. 
2 Kickx, ‘ Bull. Acad. Belg.,’ t. xviii, part 2, p. 288. 
3 Weber, ‘ Verhandl. Nat. Hist. Vereins. f. Preuss.,’ &c., 1860, p. 381. 
* Weber, loc. cit. ; 
