82 ELEMENTARY BOTANY 
lowers irregular and perigynous. 
Calyaz tubular; the number of sepals is indicated by the 
teeth—three aaenor 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 

Fic. 105.—PAPILIONACEOUS COROLLA. 
st, standard ; w, wings ; 4, keel. 
g live lateral petals 
overlapping the 
two anterior, and 
called the wings 
The two inner 
most anterior 
| petals are often 
_ joined together 
until pollination 
takes place, they 
are boatlike in 
shape, and are 
therefore called 
the. keel; The 
whole corolla is 
aa to be papilionaceous (Lat. papilio =a buttertly), from its 
supposed resemblance to a butterfly with its wings folded. 

Fic. 106.—LONGITUDINAL SECTION Fic. 107.—FLoRAL DIAGRAM 
OF SWEET PEA. 
OF SWEET PEA. 
— The andrecium consists of ten stamens, nine of which in 
the Sweet Pea are joined by their filaments, forming a tube 
