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Vascular Plants of California
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Quercus ×macdonaldii
MACDONALD OAK


Quercus ×macdonaldii Greene
NATIVE
Habit: Tree 5--15 m, deciduous; trunk bark scaly, +- gray; twigs tomentose. Leaf: 4--7 cm; petiole 3--10 mm; blade oblong to obovate, adaxially glabrous to sparsely hairy, green, +- shiny, abaxially densely appressed-stellate-hairy, +- pale green, tip obtuse to rounded, margin lobes 2--6(8) per leaf, shallow, generally pointed. Fruit: cup 10--20 mm wide, 6--10 mm deep, hemispheric, scales tubercled, canescent; nut 20--35 mm, conic-oblong to ovoid, distally acute to +- obtuse, shell glabrous inside; mature in year 1.
Ecology: Slopes, canyons, woodland; Elevation: < 600 m. Bioregional Distribution: ChI (Santa Cruz, Santa Rosa, Santa Catalina islands). Flowering Time: Mar--May Note: Considered a species by Greene but derived from hybrids involving Quercus pacifica, Quercus lobata, perhaps others; needs study.
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Botanical illustration including Quercus ×macdonaldii

botanical illustration including Quercus ×macdonaldii

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Citation for this treatment: Error CHECK eFlora Treatments 2012, Quercus ×macdonaldii, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=76906, accessed on March 24, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on March 24, 2019.