Quercus undulata (syn. Quercus × pauciloba = a hybrid of Q. gambelii and Q. turbinella) Fagaceae
Wavyleaf Oak KWER-kus
- Deciduous or semi-evergreen shrub or small tree, to 10 ft (3 m). Leaves alternate, simple, oblong or elliptical, margins serrate to undulate or shallowly lobed, tapering to base, 2-6 cm long, 1-3 cm wide, dark bluish-green above, dull green and densely hairy below. Fruit (acorn) 1-1.5 cm long with a scaly cup covering about 1/3 of the nut.
- Hardy to USDA Zone 5 Native range from Colorado to New Mexico, Arizona, Utah, Oklahoma and northern Mexico.
- The following is from the Flora of North America (http://www.efloras.org/):
Numerous hybrids of Quercus gambelii [Gamble Oak] with various scrub oaks have been reported, including Q. grisea and Q. turbinella. Such hybrids in general have shallowly lobed or dentate, semipersistent leaves and intermediate characteristics of pubescence and fruit between parental types. Such hybrids are usually referred to as the Quercus × undulata complex because of widespread application of the latter name to various populations. [From: Tucker et al. 1961. Am. J. Bot. p. 329-339. Quercus pauciloba Rydb. applies to this hybrid (Q. undulata complex). The appropriate change in status (Quercus × pauciloba Rydb.) is made.]
Numerous putative hybrid swarms occur throughout the range of Quercus gambelii that involve a number of suspected parental species. Most of these populations have, at one time or another, been referred to Quercus undulata Torrey. The putative hybrids have serrate or shallowly lobed leaves and considerable variation in habit, leaf pubescence, and acorn morphology. J. M. Tucker (1961, 1969, 1971) and J. M. Tucker et al. (1961) have identified the major components of the Q. undulata complex as Q. turbinella (western Utah and northwestern Arizona, and central Colorado), Q. grisea (New Mexico and southern Colorado), Q. havardii (southeastern Utah and northwestern Arizona), Q. mohriana (northeastern and southern New Mexico), Q. arizonica (central Arizona), and Q . muhlenbergii (eastern and central New Mexico). Quercus macrocarpa has been implicated as a parent of variable populations in New Mexico (J. M. Tucker and J. R. Maze 1966). Because of the complex variability in these populations, no effort has been made to treat them separately here; indeed, it would be impossible to produce usable keys if these were included as formal taxa.
Tucker, J. M. 1963. Studies in the Quercus undulata complex. III. The contribution of Q. arizonica. Amer. J. Bot. 50: 699-708.
- undulata: wavy, a reference to the leaf margins.