Common Name: OAK FAMILY Habit: Shrub, tree, evergreen or not; monoecious. Leaf: simple, alternate, petioled; margin entire to lobed; stipules small, generally deciduous. Staminate Inflorescence: catkin or stiff spike, many-flowered. Pistillate Inflorescence: 1--few-flowered, generally above staminate inflorescence; involucre bracts many, generally overlapping, flat or cylindric. Staminate Flower: calyx generally 4--6-lobed, minute; petals 0; stamens 4--12+. Pistillate Flower: calyx generally 6-lobed, minute; petals 0; ovary inferior, style branches generally 3. Fruit: 1 nut subtended, partly enclosed by scaly, cup-like involucre or 1--3 nuts subtended, enclosed by spiny, bur-like involucre; mature years 1--2. Seed: generally 1. Genera In Family: 7 genera, +- 900 species: generally northern hemisphere. Note: Wood of Quercus critical for pre-20th century ship-building, charcoal for metallurgy; some now supply wood (Fagus, Quercus), cork (Quercus suber), food (Castanea, chestnut). Lithocarpus densiflorus moved to Notholithocarpus. eFlora Treatment Author: John M. Tucker, except as noted Scientific Editor: Thomas J. Rosatti, Bruce G. Baldwin.
Common Name: OAK Habit: Evergreen or not. Leaf: stipules small, generally early-deciduous. Staminate Inflorescence: catkins, 1--several, pendent, slender, proximal on twig. Pistillate Inflorescence: in distal leaf axils, short-stalked; flower generally 1. Staminate Flower: stamens 4--10. Pistillate Flower: calyx minute, generally 6-lobed; ovary enclosed by involucre. Fruit: nut 1, partly enclosed by cup-like involucre (cup) with appressed scales (nut and cup = acorn), remnants of perianth and style persistent as small point at tip; scales tubercled to not; mature in years 1 (on younger stems) or 2 (on older stems). Chromosomes: 2n=24. Etymology: (Latin: ancient name for oak) Note: Many named hybrids; those (3) treated here form widespread populations; most others occur as single individuals, and some but not all of these are mentioned here, under the first parent treated (alphabetically). Reproduction of many species declining due to habitat degradation or loss as well as disease. Quercus robur added, as waif. eFlora Treatment Author: Thomas J. Rosatti & John M. Tucker Reference: Manos et al. 1999 Molec Phylogen Evol 12:333--349 Unabridged Reference: Cottam, W. P., J. M. Tucker, & F. S. Santamour. 1982. Oak hybridization at the University of Utah. State Arboretum of Utah Publication No. 1. Salt Lake City; Hardin, J. W. 1975. Hybridization and introgression in Quercus alba. Journal of the Arnold Arboretum 56: 336--363; Manos, P. S., Doyle, J. J., & Nixon, K. C. 1999. Phylogeny, biogeography, and processes of molecular differentiation of Quercus subgenus Quercus (Fagaceae). Molec Phylogen Evol 12: 333--349.
Quercus garryana Hook.
NATIVE Habit: Shrub to small tree 0.3--5 m or tree 8--20 m, deciduous; trunk bark thin, scaly, +- light gray; twigs short-hairy, +- green, glabrous in age, red-brown. Leaf: 5--15 cm; petiole 5--25 mm; blade elliptic to obovate, adaxially shiny, dark green, abaxially short-hairy, dull, light green, tip obtuse to rounded, margin lobes 5--7 per leaf, deep, entire or 2-toothed. Fruit: cup 12--25 mm wide, 4--9 mm deep, cup- to bowl-shaped, proximal scales +- tubercled, distal +- not; nut 20--30 mm, ovoid to +- spheric, distally rounded, shell glabrous inside; mature in year 1.
Citation for this treatment: Thomas J. Rosatti & John M. Tucker 2014, Quercus garryana, in Jepson Flora Project (eds.) Jepson eFlora, Revision 2, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=40616, accessed on April 19, 2024.
Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on April 19, 2024.
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(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
Data provided by the participants of the
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