Monographs Details: Cercis canadensis L. var. canadensis
Authority: Isley, Duane. 1975. Leguminosae of the United States: II. Subfamily Caesalpinioideae. Mem. New York Bot. Gard. 25 (2): 1-228.
Description:Distribution and Ecology - Range as key, except occasionally cult, to California, rich or open rocky woodlands, stream banks to limestone glades and bluffs; usually mesophytic. Common in cult. S: Feb.-March; N: April-May. E Mexico.
Discussion:C. canadensis f. alba Rehd. (1907)
C. canadensis f. glabrifolia Fern. (1936)
C. canadensis var. typica Hopkins (1942)
The eastern mesophytic redbud, of wide and common distribution in eastern forests, flowering before the woods leaf out and enveloped in gentle pink, is perhaps the most esteemed of all native American leguminous trees. Widely planted, it produces low spreading trees, often of highly individualistic architecture.
Leaves of var. canadensis are usually puberulous on the undersurface along some of the veins. Glabrate and more pubescent phenotypes occur throughout the range; white-flowered forms are occasional; all have received nomenclatural attention.
The ranges and characteristics of var. canadensis and texensis in ter digitate in north-central Texas to Oklahoma, and some herbarium material from this area is problematic. However, the taxa are largely ecologically isolated (Hopkins, 1942), var. canadensis in sandy woodlands, var. texensis in drier, alkaline, open sites. Hopkins (1942) and Turner (1959) differ in their disposal of intermediate material and my determinations more closely parallel the latter. I have presumed the xerophytic versus mesophytic nature of the leaves, without regard to shape, to be an ecological marker of the taxa. This judgement restricts var. canadensis in Texas to northeastern counties as mapped. In adjacent counties, westward, there are some large-acuminate-leaved redbuds with coriaceous blades. These are referred to var. texensis and, in general, the slightly wider fruits of that variety correlate with leaf texture rather than shape. Flowering material has been placed by flower size or where ambiguous by locality. I have made no attempt to distinguish “intermediates” as a group because the criteria are too elusive on herbarium material.
Distribution:United States of America North America
| Mexico North America