54 SOURCES OF NECTAR 
pollen never fails when the plant blooms, and the bees fairly revel 
in it during its season of blossom. It comes just at the season 
when the need of food for brood rearing is greatest, and is conse- 
quently one of the most valuable. It is usually regarded as a 
Fia. 26.—Catkins of pussy willow. 
weed, and is especially obnoxious on the lawns. The bright 
yellow flowers are not unattractive, and if it was as difficult to 
grow as some of the cultivated plants, it would be much in 
