Saddle Bags Full of Pollen

Bumble bees are important pollinators of many plants. Both queens and workers collect pollen and transport it back to the colony in pollen baskets on their hind legs.



Seen here are the "saddle bags" of pollen!





Milkweeds have a unique and fascinating pollination mechanism in which the plant relies on butterflies, moths, bees, ants, and wasps for pollination. Hundreds of pollen grains are packaged into two connected sacs, which is collectively referred to as the pollinarium. When a foraging insect lands on a flower, the pollinarium can easily attach itself to its leg. Once removed from the flower, the pollinia actually re-orient as the translator arms bend as they dry. Upon landing on another flower, the properly oriented pollinarium is deposited into a receptive stigmatic groove where the pollinia breaks down and the pollen germinates, growing pollen tubes through the stigma to the ovules in the ovary.



The milkweed fruit is a follicle, commonly referred to as a pod, which splits at one suture to release many seeds, sometimes hundreds, depending on the species.