Northern Pin Oak
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| Northern Pin Oak | ||||||||||||||||
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| Quercus ellipsoidalis E.J.Hill |
The Northern Pin Oak or Hill's Oak (Quercus ellipsoidalis) is an oak in the red oak section Quercus sect. Lobatae. It is mainly native to the northern midwest United States, and also in the southeast and southwest of Ontario, Canada. It occurs on dry, sandy, usually acidic soils. Although the name suggests an alliance to the Pin Oak Q. palustris, it is more closely related to the Scarlet Oak Q. coccinea, and is included in that species by some botanists.
It is a medium-sized deciduous tree growing to 20 m tall with an open, rounded crown. The leaves are glossy green, 7-13 cm long and 5-10 cm broad, lobed, with five or seven lobes, and deep sinuses between the lobes. Each lobe has 3-7 bristle-tipped teeth. The leaf is nearly hairless, except for small tufts of pale orange-brown down where the lobe veins join the central vein. The acorns are ellipsoid (ellipse-shaped, from which its scientific name derives), 6-11 mm long and 10-19 mm broad, a third to a half covered in a deep cup, green maturing pale brown about 18 months after pollination; the kernel is very bitter.
[edit] Uses
Northern Pin Oak is occasionally planted as an ornamental tree, popular for its bright red fall color and tolerance of infertile sandy soils. The wood is too small to be of any importance, but is similar to that of other red oaks.
[edit] References
- Sternberg (1998). Quercus ellipsoidalis. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 05 May 2006.
- Flora of North America: Quercus ellipsoidalis
