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A Branch of the Paper Birch

Here catkins of the male and female flowers of the birch are shown on the same twig. There are various species of birch available, and cross-breeding experiments may very readily be made, owing to the separate-clustering of the staminate and the pistillate flowers.

A Branch of the Paper Birch

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 11 Chapter 8