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EXPLANATION OF THE PLATES. 
Pirate LXII. RaAmnus PURSHIANA. 
A flowering branch, natural size. 
A flower, enlarged. 
Vertical section of a pistil, the calyx removed and displayed, enlarged. 
. A fruiting branch, natural size. 
Cross section of a fruit, enlarged. 
Vertical section of a nutlet, enlarged. 
. An embryo, much magnified. 
Puate LXIII. Reamnus PoursHiana. 
. A fruiting branch, natural size (Oregon form). 
A fruiting branch, natural size (var. tomentella). 
A flowering branch, natural size (mountain form). 
- Vertical section of a flower, enlarged (mountain form). 
. A petal of the same displayed, enlarged. 
Front and rear view of a stamen of the same, enlarged. 
Cross section of a fruit, enlarged (Oregon form). 
. A nutlet divided transversely, enlarged. 
. A seed, enlarged. 
An embryo, enlarged. 
. A winter-bud, natural size. 
