"Norway maple trees have greenish-yellow flowers that emerge long before the foliage in clusters of 10 to 30 buds, making a whole set about two inches wide. The flowers are unisexual and hermaphrodite, and both form upright, umbelliferous panicles." https://www.gfloutdoors.com/maple-tree-flowers-a-guide-to-maple-varieties/

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With our strange weather this year (which may end up being the "new normal"), the flowers came out AFTER the foliage. Usually, the leaves follow the tiny flowers.