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The female flowers of a catkin from the Common Aspen (Populus tremula).

Common Aspen

The female flowers of a catkin from the Common Aspen (Populus tremula).

"Pistacia atlantica. 1. male flowers; 2. an ovary; 3. the same cut open to show the ovule; 4. a ripe fruit opened to show the seed; 5. a cross section of the embryo; 6. female flowers." -Lindley, 1853

Betoum

"Pistacia atlantica. 1. male flowers; 2. an ovary; 3. the same cut open to show the ovule; 4. a ripe…

"Betula lenta. 1. male flowers; 2. female flowers; 3. perpendicular section of a ripe fruit; 4. transverse section of it." -Lindley, 1853

Sweet Birch

"Betula lenta. 1. male flowers; 2. female flowers; 3. perpendicular section of a ripe fruit; 4. transverse…

"Branch of Procris splendens; 2. cluster of male and female flowers; 3. a male flower about to expand; 4. the same expanded." -Lindley, 1853

Nettlewort

"Branch of Procris splendens; 2. cluster of male and female flowers; 3. a male flower about to expand;…