366 FOUNDATIONS OF BOTANY 
anthers have withered and the stigma is now lowered so 
as to brush against the aed of any bee which may enter. 
A little study of Fig. 259 
will make clear the way 
in which the anthers are 
hinged, so that a bee strik- 
Fic. 259.— Flower and Stamens of Common Sage. 
A, p, stigma; a, anthers; B, the two stamens in ordinary position ; /, filaments ; 
m, connective (joining anther-cells); a’, anther-cells; C, the anthers and 
connectives bent into a horizontal position by an insect pushing against a. 
ing the empty or barren anther-lobes, a, knocks the pollen- 
bearing lobes, a’, into a horizontal position, so that they 
will lie closely pressed against either side of its abdomen. 
Hay - = 
ape aa 437. Flowers with Sta 
u| es mens and Pistils Each of Two 
sawiliv, 7 Lengths. — The flowers of 
\\\ ( ) A 
bluets, partridge-berry, the 
primroses, and a few other 
common plants secure cross- 
pollination by having essen- 
tial organs of two forms 
(Fig. 260). Such flowers 
DD are said to be dimorphous 
a (of two forms). In the 
I rm short-styled flowers, II, the 
Fic. 260.— Dimorphous Flowers of 
the Primrose. anthers are borne at the top 
I, a long-styled flower; II, a short- 
:  atyaae Sues ties of the corolla tube and the 
