Progesterone. Print | Email article to a friend | Last updated: January 14, 2015. Progesterone is a hormone released by the corpus luteum in the ovary. It plays important roles in the menstrual cycle and in maintaining the early stages of pregnancy. It may also be involved in the growth of certain cancers.
Maple helicopters fall before the leaves drop from the trees. Maple trees (Acer spp.) produce winged seeds called double samaras, which twirl to the ground in late summer or early fall. They resemble helicopters in motion, earning them the common name of helicopters or whirligigs.
Maple trees produce seeds 10 to 12 weeks after the flowers are pollinated. The seeds or samaras fruit ripen in September or October depending on the weather. Maple trees drop their seeds two weeks after the seeds mature. Maple trees do not produce seeds until they are at least 30 years old. Keywords: maple tree seeds, production maple seeds, samaras fruit.