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Willoway Brook through the Schulenberg PrairieSeptember 7 2003
Armstrong, Patricia K.
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Willoway Brook through the Schulenberg PrairieSeptember 7 2003
Armstrong, Patricia K.
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Willoway Brook through the Schulenberg PrairieSeptember 7 2003
Armstrong, Patricia K.
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Willoway Brook through the Schulenberg PrairieSeptember 7 2003
Armstrong, Patricia K.
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Volunteers Planting Seed and Spreading Chaff October 25 1981
Armstrong, Patricia K.
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Viola pedata L. (bird’s foot violet), flowers, habitMay 12 1973
Armstrong, Patricia K.
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The Morton Arboretum Prairie Restoration SignDecember 12 1980
Armstrong, Patricia K.
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The Morton Arboretum patch
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Tetraneuris herbacea Greene (lakeside daisy), plant habitApril 23 2002
Armstrong, Patricia K.
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Teaching Environmental Awareness Program Participants at the West Chicago Prairie September 26 1977
Armstrong, Patricia K.
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Teaching Environmental Awareness Program Participants at the Markham PrairieSeptember 27 1976
Armstrong, Patricia K.
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Symphyotrichum novae-angliae (L.) G.L.Nesom (New England aster), habit, habitatNovember 6 1976
Armstrong, Patricia K.
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Symphyotrichum novae-angliae (L.) G.L.Nesom (New England aster), flowers hosting a butterflySeptember 1974
Armstrong, Patricia K.