![]() ![]() Mean annual precipitation across interior live oak's distribution in California ranges from 15 to 50 inches (380-1,300 mm). It is adapted to dry sites among California's red oaks, interior live oak has the highest tolerance for xeric conditions. Interior live oak grows strictly in a mediterrean climate, which is characterized by mild, wet winters and hot, dry summers. Interior live oak mostly grows on harsh sites that other oaks cannot tolerate. SITE CHARACTERISTICS AND PLANT COMMUNITIES: Īs of 2011, only one English-language publication provided information on interior live oak populations in Baja California Norte, so except for that source, all geographical locations referred to in this review are in California.ġ976 USDA, Forest Service map provided by The distributions of both varieties extend to Baja California Norte. Scrub interior live oak is most common in southern California, especially in the Transverse and Peninsular Both varieties are common in northern California. Interior live oak is most common in the Inner Coast Ranges, the foothills of the southern Cascade Range, and the Sierra Nevada. It occurs over about 16% of California's landscape. Interior live oak is a native California-Baja California endemic. ![]() SITE CHARACTERISTICS AND PLANT COMMUNITIES.SYNONYMS:ĭISTRIBUTION AND OCCURRENCE SPECIES: Quercus wislizeni Interior live oak and Santa Cruz Island oak are sometimes treated as synonyms, but are treated as distinct species in this review. Dodd and others suggest that coastal populations of interior live oak, which have high amounts of introgression overall, should be reclassified as Santa Cruz Island oak, with gene flow from interior live oak to coast live oak, then to Santa Cruz Island oak, making separation of the 3 species difficult in coastal locations. Backcrossing andĪre most common between interior live oak and coast live oak, which genetic tests show are the most closely related of California's red oaks. Interior live oak populations show less introgression with California black oak, which is deciduous. Interior live oak populations in northern California show genetic evidence of considerable introgression with coast live oak and Shreve oak ( Q. In California, all red oak species show some degree of Oracle oak is a stable California black oak × interior live oak hybrid. Among California's red oaks, interior live oak hybridizes frequently with coast live oak ( Q. In this review, "interior live oak" refers to the species as a whole, and the varieties are referred as "the typical variety" or "scrub interior live oak".įacile hybridization among red oaks makes the separation of species within that subgenus a taxonomic challenge. Most information on interior live oak is written at the species level. frutescens Englem., scrub interior live oak wislizeni, typical variety of interior live oak ![]() There are 2 varieties of interior live oak : It is in the red or black oak subgenus ( Lobatae). The scientific name of interior live oak is Quercus wislizeni A. Rocky Mountain Research Station, Fire Sciences Laboratory (Producer).įor Quercus wislizeni (the species) and Quercus wislizeni var. Department of Agriculture, Forest Service, Photo courtesy of Charles Webber © California Academy of Sciences. BOTANICAL AND ECOLOGICAL CHARACTERISTICSĪn interior live oak woodland in Mariposa County, California. ![]()
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