Quercus sinuata
Quercus sinuata is a species of oak comprising two distinct varieties, "Quercus sinuata" var. "breviloba" and "Quercus sinuata" var. "sinuata", occurring in southeast North America. Description. "Quercus sinuata" is a deciduous tree up to 20 metres (67 feet) tall. Leaves are narrow, with shallow rounded lobes. It tends to grow in wet habitats, such as on river bluffs, river bottoms, and flatwoods, and generally over basic substrates, such as mafic rocks, shells, or calcareous sediment. There are two varieties, with morphologically intermediate forms sometimes occurring where their ranges overlap: Common names. Perhaps arising from the classification challenges posed  by a lack of morphological consistency among individuals of the species, the common name bastard oak may refer to either var. "sinuata" or var. "breviloba" or to any of their intermediate forms. The common names Durand oak and Durand white oak most often refer to "Quercus sinuata" var. "sinuata". Other common names for "Quercus sinuata" var. "sinuata" include bastard white oak and bluff oak, but these names more often refer to "Quercus austrina". Common names for "Quercus sinuata" var. "breviloba" are Bigelow oak, Bigelow's oak, shallow-lobed oak, white shin oak, scaly-bark oak, limestone Durand oak, and shortlobe  oak. Other common names include scrub oak or shin oak, but these names may refer to a number of other low growing, clump forming oak species, subspecies or varieties. For clear differentiation in common reference, American Forests uses Durand Oak to mean "Quercus sinuata" var. "sinuata" and Bigelow oak to mean "Quercus sinuata" var. "breviloba", a shrubby variety of "Quercus sinuata" distinguished in part by its habit of forming clonal colonies in parts of its range. Distribution and habitat. "Quercus sinuata" var. "breviloba" is native to central and north central Texas, south central and southwest Oklahoma, and to Coahuila, Nuevo  León, and Tamaulipas in northern Mexico. "Quercus sinuata" var. "sinuata" is native to the south-central and southeastern United States from central Texas and southwestern Arkansas to the Carolinas. Their respective ranges intersect in the Hill Country of central Texas, where streams flowing through dry, brushy limestone hills create a mosaic of wet and well drained habitats.