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gravelly volcanic soil on low hillside of rhyolitic tuff .
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Specimen collected from unknown location by Fred Roberts for RSA oak workshop.
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young leaves
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vouchered by #17595 (JEPS101112, JEPS 101124)
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riparian corridor of small tributary of Rio Verde in narrow canyon cut in volcanic rhyolitic tuff. Plants in volcanic silts, coarse soils, mixed gravels and scattered large boulders of canyon bottomland.
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Seeds germinate before dispersal
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