364 POLYPHYLLY. 
present, but where, under peculiar circumstances, five 
may be found—thus rendering the symmetry complete.’ 
In Papilionacew, wherein usually only one carpel is 
developed, we occasionally find two, or even more, as 
in Wistaria, Gleditschia, Trifolium, &e. In Prunus and 
Amygdalus from two to five carpels are occasionally to 
be found,’ in Mimosa five, in Umbellifercee three to five ; 
in some composites, e.g. Spilanthes, five carpels have 
also been noticed; in Crucifere three and four, in 
orasses three.” The double cocoa-nut affords an illus- 
tration of the development of two carpels out of three, 
one only generally arriving at perfection. ‘Triple nuts 
(Corylus) also owe their peculiarity to the equal develop- 
ment of all three carpels which exist in the original 
flower, but of which, under ordinary circumstances, 
two become abortive. It is necessary, however, to 
distinguish these cases from those in which two embryos 
are developed in one seed. 
The following list may serve to show in what genera 
this change has been most frequently noticed, and it 
may be said in general terms that Crucifere, Umbelli- 
fere, and Inliacew, are the orders most frequently 
affected. Cases of peloria are not included in the 
subjoined list. 
Nigella. Ptelea. 
Aquilegia. Citrus ! 
Peonia ! Philadelphus. 
Delphinium ! Prunus! 
Tberis. Amygdalus ! 
Diplotaxis. Crategus ! 
Lunaria. Fuchsia ! 
Ricotiana. Trapa ! 
Octadenia. Cassia. 
Draba! Cercis. 
Lepidium. Medicago. 
*Cheiranthus ! *Phaseolus ! 
Dianthus. Wistaria. 
Brassica ! Gleditschia. 
Parnassia. Affonsea. 
*A cer ! Trifolium ! 
! Giraud, ‘ Hd. Phil. Mag.,’ Dec., 1839. 
* See Cerasus Caproniana, D. C. ‘ Plant. Rar. Hort. Genev.,’ tab. 18. 
3 Nees, ‘ Linnea,’ v, p. 679, tab. 11 (Scheenodorus). 
