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on coarse limestone sands and gravels at roadside crossing gently sloping out-wash plain
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semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Adenophyllum porophyllum, Priva aspera
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semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Adenophyllum porophyllum, Priva aspera
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semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Adenophyllum porophyllum, Priva aspera
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semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Adenophyllum porophyllum, Priva aspera
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semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Adenophyllum porophyllum, Priva aspera
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an exceptionally large 3' single plant on eroded outcrop of rhyolitic tuff flow at roadside. Scale provided by Ms. Patty Manning, Sul Ross State University, Alpine TX
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Note clasping auricules. Plants in semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Adenophyllum porophyllum, Priva aspera
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an exceptionally large 3' single plant on eroded outcrop of rhyolitic tuff flow at roadside.
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Plants in semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Adenophyllum porophyllum, Priva aspera
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an exceptionally large 3' single plant on eroded outcrop of rhyolitic tuff flow at roadside.
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Plants in semi-shaded Quercus oblongifolia understory on volcanic alluvial substrate at mid canyon below western rim of Barranca Sirupa with Zinnia peruviana, Adenophyllum porophyllum, Priva aspera
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flowers on an exceptionally large 3' single plant on eroded outcrop of rhyolitic tuff flow at roadside.