Monographs Details: Passiflora canadensis
Authority: Hollick, Charles A. 1927. The Flora of the Saint Eugene Silts, Kootenay Valley, British Columbia. Mem. New York Bot. Gard. 7: 389-428.
Description:Species Description - Leaf trilobate, approximately 3 to 4 centimeters in length by about the same in maximum width, wedge-shaped below, terminating in a narrow truncate-cordate base; lateral lobes relatively narrow; median lobe expanded toward the middle; sinuses deep and rounded; margin finely serrate-dentate; nervation 3-palmate, each lateral primary extending into one of the lateral lobes; secondary nerves irregularly spaced and disposed, branched toward the extremities, each main nerve and branch terminating in one of the marginal dentitions.
PLATE 37, FIGURE 2
This is not a satisfactory specimen upon which to base a specific description or even a generic identification; but its general characters are too conspicuous and obvious to be ignored, and these are sufficiently well defined to indicate relationship with the genus Passiflora, and to enable tentative comparison to be made with certain of the leaf forms of the existing P. incarnata Linnaeus, the common red passion flower of the southern United States (see TEXT-FIGURE 1, introduced for comparison).
This is about as polyphyllous a genus as almost any one that could be named, and the leaves in a single species, and even on an individual plant, are often of most diverse forms, so that, as in connection with leaves of the Menispermaceae, a large number of comparisons are necessary in order to determine where the greatest similarity may be found between fossil and existing forms.
The genus has not been heretofore recognized in America in any deposits of Tertiary age. Several species were described and figured from the middle Tertiary of the Old World, but none of these could by any possibility be confused with our specimen, and no comparison between them or any further reference to them, is necessary. The genus Passiflora, as it exists to-day, is mostly tropical and semitropical in its distribution; but the species P. incarnata, which our specimen appears to resemble most closely, is native as far north as Virginia and Missouri, and is said to be hardy, in cultivation, somewhat further northward.