Flowers. 



189 



corolla (see Fig. 105). The filament (/) is very short and 

 bears a two-armed connective (cc), the upper arm being 

 long and thread-like and supporting a pollen-bearing anther, 

 while the lower arm is short, spatulate, and sterile. By 

 pressure on the lower arm the upper arm may be rotated 



Fig. 105. 



Pollination of Salvia glutinosa. i, a stamen. The upright column to the left of/ 

 is the filament, c, c, the connective, anther bearing above and sterile below. 

 2 and 3, longitudinal diagrams of a young tiower, showing the anther in its 

 natural position in 2, and pushed down by a bee by pressing on the lower part 

 of the connective, in 3. 4, a bee visiting a younger flower ; the anthers pushed 

 down upon its back. 5, a bee visiting an older flower; the style having become 

 elongated and pendent touches the bee's baclc. After Kerxer. 



downward, the short filament acting as a fulcrum. When 

 a bee which has alighted on the lower lip attempts to thrust 

 its suction apparatus into the tube of the corolla, its head 

 presses against the lower arm, and the two anthers are 

 rocked forward until they press against the bee's body 

 and discharge pollen upon it (3 and 4). In the younger 

 flowers the styles remain close under the upper lip (dia- 

 grams 2 and 3), but as the flowers get older the styles 

 bend down so that visiting bees would necessarily rub 

 their backs against the stigmas (s). In this way the 



