July 4, 2012
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Southeastern, New Hampshire
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I wish there was is easier way to tell the difference between Scarlet Oak (Quercus coccinea)
and Black Oak (Quercus velutina) without looking at the terminal winter bud. Black Oak has
a very long (7-10 mm) terminal Winter bud. There probably is an easier way to tell the difference,
but I don’t know it yet.
There are only 5 oaks in New England that have leaves with bristle on the tips and lobes:
- Bear Oak/Scrub Oak (Quercus ilicifolia): Short to tall shrubs (up to 16 feet).
Distal leaf lobes long and spreading. Proximal leave lobes much shorter. Short (10-25 mm) petiole.
- Red Oak (Quercus rubra): Sinuses of leaf usually extending less than 1/2
the distance from the tip of the lobes to the midrib.
- Black Oak (Quercus velutina): Long (7-10 mm) terminal winter bud.
- Pin Oak (Quercus palustris): Terminal winter bud is glabrous or with just a few
hairs at the apex. The bud tends to be more pointed than Scarlet Oak bud. Rounded to obscurely
angled in cross-section. Inner bark is pinkish.
- Scarlet Oak (Quercus coccinea): Terminal winter bud is hairy at the apex. Bud
is 5-angled in cross-section. Inner bark is orangish pink.
I thought it might be Pin Oak, but it is not found in New Hampshire (normally) and a closeup
of the bud showed that the apex was hairy (see picture below).
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