Unsatisfactory yields of sweet-clover seed 1
Previous investigations of the pollination of sweet clover 2
Outline of pollinating experiments 3
Structure of the flowers of Melilotus alba 4
Development of the floral organs of sweet clover 5
Fertilization in Melilotus alba 8
Development of the seed 8
Mature pollen of sweet clover 9
Germination of the pollen 9
Cross-pollination and self-pollination of sweet clover 10
Artificial manipulation of sweet-clover flowers 10
Seed production of Melilotus alba under ordinary field
conditions 13
Efficiency of certain kinds of insects as pollinators of
sweet clover 14
Relation of the position of the flowers on Melilotus alba
plants to seed production 19
Influence of the weather at blossoming time upon seed
production 20
Insect pollinators of sweet clover 21
Effect of moisture upon the production of Melilotus alba seed 22