290 METAMORPHY. 
tions being petaloid and continuous with the dilated 
filament. Not unfrequently these semi-petaloid sta- 

Fic. 155.—Four-winged filaments of Rhododendron. 
mens adhere to the fronts of the petals, and then it 
appears, at a first glance, as if three organs were stuck 
together, one in front of another, while in reality there 
are but two.’ (See ante, p. 35, fig. 12.) 
The change in the anther, above alluded to, must not 
be mistaken for that far more common one in which 
only a small portion of the anther becomes petaloid, 
forming a sort of lateral wing or appendage to the 
polliniferous portion, as happens normally in Pterandra, 
and is common in some double fuchsias. In this 
latter instance there is but a single wing, and the 
nature of the case is obvious. 
Double flowers of Orchidacew generally arise from 
petalification of the filaments, with or without other 
coincident changes. What makes double flowers in 
this order the more interesting is the development, in 
a petaloid condition, of some or all of those stamens 
which under ordinary circumstances are wholly sup- 
pressed, go that the morphological structure of the 
flower, at first a matter of theory, becomes actually 
1 Masters, “On Double Flowers,” ‘Rep. Internat. Bot. Congress,’ 
London, 1866, p. 127. 
