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.
Seed Pod: Description: Seeds: Seed Close-up: Germination Method I Used: Seedling: Abutilon vitifolium. Malvaceae. Flowering Maple: Seedpod is a slightly hairy ball with 8 chambers. Seeds are small brown beans. Many seeds in a pod. Winter/Spring Deno (5 days) Summer Outside (63 days) Acacia dealbata. Mimosaceae. Wattle, Mimosa: Seed pod is a bean pod. Seeds are shiny, dark brown beans with a white tuft at one end. Many seeds in a pod. Nick & soak seed. Any time Deno/Propagator (1-16 days) Acacia erioloba