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Worldwide, the oaks (Quercus spp.) consist of 275 to 500 species that can be separated into three groups based on their microanatomy: the live or evergreen oak group, the red oak group (Erythrobalanus), and the white oak group (Leucobalanus).
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www2.fpl.fs.fed.us/techsheets/HardwoodNA/htmlDocs/querc...
www2.fpl.fs.fed.us/techsheets/HardwoodNA/htmlDocs/quercussp.html
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A PLANTS profile of Quercus (oak) from the USDA PLANTS database ... Click on a thumbnail to view an image, or see all the Quercus thumbnails at the PLANTS Gallery...
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plants.usda.gov/java/profile?symbol=QUERC
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Comparison of Features of Oaks (Quercus spp.) ... Quercus alba ; white oak ... Quercus bicolor ; swamp white oak...
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www.cas.vanderbilt.edu/bioimages/pages/compare-oaks.htm
www.cas.vanderbilt.edu/bioimages/pages/compare-oaks.htm
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Quercus spp. . FAGACEAE oak ... Genus Quercus Species spp. Variety Cultivar Common names oak Family FAGACEAE Specimen number S8401 Data source ColorNat p21;BtrflyCa p187 ... Suitable for gardens no Nursery Unknown Compost no Size at acquisition Unknown Garden location Unknown Garden notes Quercus spp.
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www.crescentbloom.com/plants/specimen/QU/Quercus%20spp....
www.crescentbloom.com/plants/specimen/QU/Quercus%20spp.htm
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Quercus and Picea abies seedlings. June 9, 2003 ... mixed valley oak (Quercus lobata, q. wislizeni); California valley oak and interior live oaks ... Magnoliopsida > Fagales > Fagaceae > Quercus spp. L.
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www.forestryimages.org/browse/subimages.cfm?SUB=2759
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The photo above shows the male flowers of Quercus marilandica (black-jack oak). These flowers are highly reduced (they're not much more than stamens that produce large quantities of pollen) and are arranged in inflorescences called catkins.
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www2.wabash.edu/blog/whatsthatplant/2009/04/quercus_spp...
www2.wabash.edu/blog/whatsthatplant/2009/04/quercus_spp.html
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About the Iowa state tree, Oak (Quercus spp.), and its adoption. ... Quercus spp.: University of Connecticut Plant Database of Trees, Shrubs and Vines.
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www.netstate.com/states/symb/trees/ia_oak.htm
www.netstate.com/states/symb/trees/ia_oak.htm
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hedgerow and verge consultancy service, exploring environmental aspects of hedgerow ecology and management strategies ... The term oak can be used as part of the common name of any of several hundred species of trees and shrubs in the genus Quercus, and some related genera, notably Cyclobalanopsis and Lithocarpus.
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hedgerowmobile.com/oak.html
hedgerowmobile.com/oak.html
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Quercus robur, Q. petraea, Q. pubescens, Q. rubra, Q. cerris, Q. palustris, Q. suber, Q. pseudosuber, Q. ilex, Q. coccinea ... (There are about 2000 species all over the world, focussing in the northern hemisphere.); ... ; Oaks are mighty trees, although some Mediterranean species decrease to tiny shrubs. In general they...
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www.polleninfo.org/index.php?language=en&nav=_n2&module...
www.polleninfo.org/index.php?language=en&nav=_n2&module=article&action=first_page&row=18&id_parent=24
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