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ophis: leader sampled low on tree
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ophis: 1st year twig with narrowly conical vegetative bud
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ophis: vegetative end bud, trembling aspen
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ophis: sliced vegetative bud, trembling aspen
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ophis: 5th year twig, trembling aspen
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ophis: male twig, trembling aspen
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ophis: male 1st year twigs, trembling aspen
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ophis: 3rd year twig, trembling aspen
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ophis: breaking male bud, trembling aspen
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ophis: male buds, quaking aspen
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ophis: sliced 1st, 2nd, and 3rd year twigs, quaking aspen