Photographic image
Agave palmeri Engelm. (Palmer's century plant), flowersJuly 17 1959
Lamp, Herbert F.
Photographic image
Agastache scrophulariifolia (Willd.) Kuntze (purple giant-hyssop), stem, flowerSeptember 1978
Dritz, Ken
Photographic image
Aconitum columbianum Nutt. (Columbian monkshood), flowersAugust 1988
Coulter, Ronald M.
Photographic image
Achillea millefolium (yarrow), close-up of white corymb
Photographic image
Achillea millefolium (yarrow), close-up of umbel inflorescence clusterJuly 1973
Lamp, Herbert F.
Photographic image
Achillea millefolium (yarrow), close-up of flowers
Photographic image
Achillea millefolium lanulosa 'Mountain yarrow', flowers
July 1977
Coulter, Ronald M.