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EXPLANATION OF THE PLATE. 
Pirate CCCCLII. Berruna NIGRA. 
. A flowering branch, natural size. 
Scale of a staminate ament, rear view, enlarged. 
. Pistillate flowers with their scale, front view, enlarged. 
. Scale of a pistillate ament, rear view, enlarged. 
. A fruiting branch, natural size. 
Scale of a strobile, enlarged. 
. A nut, enlarged. 
. Vertical section of a nut, enlarged. 
. A winter branch with staminate catkins, natural size. 
. A sterile winter-bud, enlarged. 
