82 ELEMENTARY: BOTANY 
Flowers irregular and perigynous. 
Calyx tubular; the number of sepals is indicated by the 
_teeth—three anterior, two posterior. 
The corolla is very characteristic of this Order, as known in 
temperate regions. It consists of five petals: one large 
posterior, overlapping the others ; this is the standard. Next 
twolateral petals 
overlapping the 
_ twoanterior,and 
called the wings. 
— The two inner- 
most anterior 
petals are often 
_ jomed together 
— until pollination 
takes place, they 
- : are boatlike in 
shape, and are— 
therefore called 
Vic. 105.—Parritonaczovs Cororza. —° bhe keel. The 
st, standard ; w, wings ; &, keel. whole corolla is 
said to be papilionaceous (Lat. papilio=a butterfly), from its 
supposed resemblance to a butterfly with its wings folded. 


Fic. 106.—LoNGITUDINAL SECTION Kia, 107,—FLORAL DIAGRAM 
OF SWEET PEA. OF SWEET PRA. 
The andrecium consists of ten stamens, nine of which in 
the Sweet Pca are joined by their filaments, forming a tube 
