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Symphyotrichum novae-angliae (L.) G.L.Nesom (New England aster), flowers hosting a butterflySeptember 1974
Armstrong, Patricia K.
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Andropogon gerardii Vitman (big bluestem), habitSeptember 1974
Armstrong, Patricia K.
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Andropogon gerardii Vitman (big bluestem), seeds on stem
September 1974
Armstrong, Patricia K.
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Andropogon gerardii Vitman (big bluestem), seeds on stemsSeptember 1974
Armstrong, Patricia K.
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Sorghastrum nutans (L.) Nash (Indian grass), seeds on stemsSeptember 1974
Armstrong, Patricia K.
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Sorghastrum nutans (L.) Nash (Indian grass), seeds September 1974
Armstrong, Patricia K.
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Filipendula rubra (Hill) B. L. Robins. (queen of the prairie), flowersJuly 8 1974
Armstrong, Patricia K.
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Arctostaphylos alpina (L.) Spreng. (alpine bearberry), fruit and leavesAugust 1974
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Arisaema triphyllum (L.) Schott (Jack-in-the-pulpit), hooded bloom on stalk
May 1974
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Arisaema triphyllum (L.) Schott (Jack-in-the-pulpit), flowerhead May 1 1974
Shouba, Jack
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Aristolochia manshuriensis Komar. (Manchurian pipe vine), flower and leaf June 1974
Kohout, John
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Armeria maritima (Mill.) Willd. ssp. sibirica (Turcz. ex Boiss.) Nyman (Siberian sea thrift), stems and flowers
September 1974
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Asarum canadense L. (wild-ginger), pair of leaves with flower at baseMay 1974
Schrattenholzer, Friedrich
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Asclepias curassavica L. (blood flower milkweed), flower with stem and leavesDecember 24 1974
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Asclepias hirtella (Pennell) Woodson (tall green milkweed), flowers and leaves on stemMarch 1974
Halama, Jeanne
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Asclepias syriaca (common milkweed), close-up of split follicle with dispersing seeds with hairs attachedOctober 1974