3. An analytical key to six species belonging to the Sect.
Physocarpae follows.
1{Protuberances found on almost all the cells in the upper epidermis. Spine cells found only in the margin-
C. Michauxiana Protuberances never occurring in the epidermis. Spine cells often found in the epidermis on the nerve -2
2{Hinge cells thin-walled, with many resemblances to the epidermal cells on the nerve. Stomata 30-40μ in length -3 Hinge cells thick-walled. Stomata smaller than 30μ in length-4
3{Marginal portion of the leaf slightly revolved. Stomata 30-35μ in width. Projection on the under side of the midrib rounded -
C. Idzuroei Marginal portion of the leaf slightly involved. Stomata 25-30μ in width. Projection on the under side of the midrib cuneiform-
C. Dickinsii4{Stomata found in the upper epidermis. Stomata in the under epidermis 25-30μ in width -
C. saxatilis Stomata never found in the upper epidermis. Stomata in the under epidermis ca. 20μ in width -5
5{Hinge cells in two or three layers, the under ones in many rows -
C. laevirostris Hinge cells in one layer -
C. vesicaria
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