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Arisaema triphyllum (L.) Schott (Jack-in-the-pulpit), close-up of fruit September 1971
Gutenstein, Hanns
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Asclepias tuberosa L. (butterfly weed), close-up of habitJuly 23 1990
Gutenstein, Hanns
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Salt Study, comparison of three pine needle samples from S1, S2, and H1June 1989
Gutenstein, Hanns
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Aesculus parviflora (bottlebrush buckeye), inflorescence July 1958
Gutenstein, Hanns