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Agastache scrophulariifolia (Willd.) Kuntze (purple giant-hyssop), habitSeptember 1978
Dritz, Ken
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Agastache scrophulariifolia (Willd.) Kuntze (purple giant-hyssop), stem, flowerSeptember 1978
Dritz, Ken
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Ailanthus altissima (Mill.) Swingle (tree of heaven), close-up of flowerJuly 1982
Dritz, Ken
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Alnus glutinosa (L.) Gaertn. (European black alder), close-up of catkinsMay 1976
Dritz, Ken
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Amaranthus powellii S.Wats. (Powell's amaranth), close-up of inflorescenceSeptember 1978
Dritz, Ken
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Amaranthus powellii S.Wats. (Powell's amaranth), stalk with inflorescence June 1980
Dritz, Ken
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Amaranthus tuberculatus (Moq.) Sauer (roughfruit amaranth), seedsSeptember 1978
Dritz, Ken
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Amelanchier humilis Wiegand (low serviceberry), close-up of flowersMay 1984
Dritz, Ken
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Ammophila breviligulata Fern. (American beachgrass), close-up of spikeletsAugust 1979
Dritz, Ken
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Ammophila breviligulata Fern. (American beachgrass), spike-like flower with spikelets (flower clusters)June 1980
Dritz, Ken
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Amorpha fruticosa L. (indigo-bush), close-up of inflorescence in budDecember 1980
Dritz, Ken
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Anthemis arvensis var. agrestis (Wallr.) DC (corn chamomile), habitDecember 1980
Dritz, Ken
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Anthoxanthum odoratum L. (sweet vernal grass), close-up of inflorescenceMay 1983
Dritz, Ken
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Anthriscus caucalis M. Bieb. (burr chervil), close-up of umbel June 1979
Dritz, Ken