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background beauty botany chlorophyll claytoniana color cretaceous devonian environment exotic fern ferns fiddlehead fiddleheads flora flower flowers folklore food forest fresh garden green grow growth horsetails leaf leaves leptosporangiate marattioid midsummer mosses natural nature night ophioglossoid ornamental osmunda park plant plants pteridophyte seeds slavic spring sprout stems traditional tropical tubers used vascular vibrant whisk