
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 
: . 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 
522) - therefore called 
Fic. 105.—Parrtionaceous GoroLLa. the feel. 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. © 

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Fic. 106.—LONGITUDINAL SECTION Fig. 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 
