136 



FLOWERS OF ROCKS, WALLS, ETC. 



When the hood is bent down it does not rise again, but the stamens 

 and pistil fly upwards, becoming concealed in the hollow of the upper 

 petal, and the flower can only be visited once. The under side of the 

 bee is dusted with pollen, heaped upon the stigma. Pollen is brought 

 to the stigma if the bee comes from another flower. Bombus agrorum, 

 with proboscis 12-15 nun., is the main visitor. 



In Corydalis cava the flowers are larger and more conspicuous than 

 in Fumaria, and have no power to self-pollinate, being sterile with their 

 own pollen, and not perfectly fertile with pollen from another flower, 



Photo. Flatters & G.irn 



YELLOW WALL FUMITORY (Corydalis lu/ea, D.C.) 



but only so with pollen from a different plant. The tube is 12 mm. 

 long, and hive-bees with proboscis 6 mm. cannot get at the honey, but 

 only the humble-bee with proboscis 7-10 mm., though even they 

 cannot easily get at it. The insect bites a hole at the base of the tube 

 to reach the honey, and the visitors are Andrcna, Sphecodes, Noinada, 

 and Hive-bees (pollen-seekers). 



The plant is dispersed by its own agency. The capsule is oblong, 

 2-valved, and swollen, and disperses the seeds, which are small, around 

 the plant. 



This is a humus-loving plant, requiring a mild humus soil, which it 

 obtains in the habitats it frequents in woods and shaded spots. 



The name Corydalis given by Galen is the Greek Corydalis for 



