Acer platanoides (Norway maple), flowers (3.38069)
Date: May 1980Creator: Dritz, Ken
Type: Photographic image
Description:Acer platanoides (Norway maple), closeup detail of bright yellow-green flowers in erect rounded cluster
Extent: 1 slide
Acer rubrum (red maple), flowers (3.38162)
Date: May 1984Creator: Dritz, Ken
Type: Photographic image
Description:Acer rubrum (red maple), closeup detail of slightly yellowish male flowers
Extent: 1 slide
Acer rubrum (red maple), flowers (3.38167)
Date: May 1984Creator: Dritz, Ken
Type: Photographic image
Description:Acer rubrum (red maple), closeup detail of clusters of red female flowers budding from twig
Extent: 1 slide
Acer saccharum ssp. nigrum (black maple), flower (3.37555)
Date: May 1980Creator: Dritz, Ken
Type: Photographic image
Description:Acer saccharum ssp. nigrum (black maple), closeup detail of small flower in pendulous cluster
Extent: 1 slide
Acer saccharum ssp. nigrum (black maple), flowers (3.37556)
Date: May 1980Creator: Dritz, Ken
Type: Photographic image
Description:Acer saccharum ssp. nigrum (black maple), closeup detail of two small flowers in pendulous clusters
Extent: 1 slide
Agastache scrophulariifolia (Willd.) Kuntze (purple giant-hyssop), habit (3.82781)
Date: September 1978Creator: Dritz, Ken
Type: Photographic image
Description:Agastache scrophulariifolia (Willd.) Kuntze (purple giant-hyssop), dentated arrow head leaves, opposite leaves, tubular pink to purple color flower with stamens, long stems
Extent: 1 slide
Agastache scrophulariifolia (Willd.) Kuntze (purple giant-hyssop), stem, flower (3.82782)
Date: September 1978Creator: Dritz, Ken
Type: Photographic image
Description:Agastache scrophulariifolia (Willd.) Kuntze (purple giant-hyssop), tubular purple flower with stamen, dentated oval shaped pointed leave, green stem covered with short white hairs
Extent: 1 slide
Agrimonia parviflora Aiton (Swamp Agrimony), habit (3.82812)
Date: June 1980Creator: Dritz, Ken
Type: Photographic image
Description:Agrimonia parviflora Aiton (Swamp Agrimony), plant, yellow flowers, buds, long green stems, stipules leafike elliptical toothed leaves, green and brown grass at the background
Extent: 1 slide
Agrostis alba L. (redtop), habitat (3.82832)
Date: July 1984Creator: Dritz, Ken
Type: Photographic image
Description:Agrostis alba L. (redtop), long green stalk with yellow-brown and pink-purple panicle, green narrow foliage
Extent: 1 slide
Agrostis alba L. (redtop), spikelet (3.82837)
Date: July 1978Creator: Dritz, Ken
Type: Photographic image
Description:Agrostis alba L. (redtop), empty purple gumes, full spikelet, pedical
Extent: 1 slide
Agrostis perennans (Walter) Tuck. (upland bentgrass), foliage (3.82838)
Date: June 1980Creator: Dritz, Ken
Type: Photographic image
Description:Agrostis perennans (Walter) Tuck. (upland bentgrass), green foliage, drooped long stalk, white-yellow spikelets
Extent: 1 slide
Ailanthus altissima (Mill.) Swingle (tree of heaven), close-up of flower (3.82848)
Date: July 1982Creator: Dritz, Ken
Type: Photographic image
Description:Ailanthus altissima (Mill.) Swingle (tree of heaven), close-up of flower.
Extent: 1 slide
Aira caryophyllea L. (silver hairgrass), habit (3.82855)
Date: June 1983Creator: Dritz, Ken
Type: Photographic image
Description:Aira caryophyllea L. (silver hairgrass), habit, leaves, flowers.
Extent: 1 slide
Allium fistulosum L. (welsh onion), close-up of flowers (3.83268)
Creator: Dritz, Ken
Type: Photographic image
Description:Allium fistulosum L. (welsh onion), close-up of white flowers in an umbel; both pistils and stamens visible
Extent: 1 slide
Allium fistulosum L. (welsh onion), flowers and leaves (3.83266)
Date: June 1980Creator: Dritz, Ken
Type: Photographic image
Description:Allium fistulosum L. (welsh onion), white flowers, linear leaves
Extent: 1 slide
Alnus glutinosa (L.) Gaertn. (European black alder), catkins and twigs (3.83300)
Creator: Dritz, Ken
Type: Photographic image
Description:Alnus glutinosa (L.) Gaertn. (European black alder), male catkins, twigs, and developing fruits and leaves
Extent: 1 slide
Alnus glutinosa (L.) Gaertn. (European black alder), close-up of catkins (3.83310)
Date: May 1976Creator: Dritz, Ken
Type: Photographic image
Description:Alnus glutinosa (L.) Gaertn. (European black alder), close-up of two catkins
Extent: 1 slide
Alopecurus aequalis Sobol. (shortawn foxtail), flowers on stem (3.83374)
Date: May 1985Creator: Dritz, Ken
Type: Photographic image
Description:Alopecurus aequalis Sobol. (shortawn foxtail), grass flowers along stem
Extent: 1 slide
Alopecurus geniculatus L. (water foxtail), flowering stalk (3.83378)
Creator: Dritz, Ken
Type: Photographic image
Description:Alopecurus geniculatus L. (water foxtail), flowering stalk
Extent: 1 slide
Alopecurus pratensis L. (meadow foxtail), flower stalk (3.83381)
Date: May 1983Creator: Dritz, Ken
Type: Photographic image
Description:Alopecurus pratensis L. (meadow foxtail), flower stalk; stamens and pistils visible
Extent: 1 slide
Amaranthus cruentus L. (red amaranth), flowers and leaves (3.83395)
Date: August 1987Creator: Dritz, Ken
Type: Photographic image
Description:Amaranthus cruentus L. (red amaranth), habit; inflorescence composed of many spikes of purple-red flowers; alternately arranged green leaves
Extent: 1 slide
Amaranthus powellii S.Wats. (Powell's amaranth), close-up of inflorescence (3.100935)
Date: September 1978Creator: Dritz, Ken
Type: Photographic image
Description:Amaranthus powellii S.Wats. (Powell's amaranth), close-up of pale green inflorescence
Extent: 1 slide
Amaranthus powellii S.Wats. (Powell's amaranth), stalk with inflorescence (3.100937)
Date: June 1980Creator: Dritz, Ken
Type: Photographic image
Description:Amaranthus powellii S.Wats. (Powell's amaranth), stalk with inflorescence
Extent: 1 slide
Amaranthus tuberculatus (Moq.) Sauer (roughfruit amaranth), habit (3.82418)
Creator: Dritz, Ken
Type: Photographic image
Description:Amaranthus tuberculatus (Moq.) Sauer (roughfruit amaranth), close-up view of several stalks, with leaves, and mature and immature fruiting bodies
Extent: 1 slide
Amaranthus tuberculatus (Moq.) Sauer (roughfruit amaranth), seeds (3.82419)
Date: September 1978Creator: Dritz, Ken
Type: Photographic image
Description:Amaranthus tuberculatus (Moq.) Sauer (roughfruit amaranth), close-up view of seed pods opened on one stalk
Extent: 1 slide
Amelanchier humilis Wiegand (low serviceberry), close-up of flowers (3.83462)
Date: May 1984Creator: Dritz, Ken
Type: Photographic image
Description:Amelanchier humilis Wiegand (low serviceberry), close-up of white flowers.
Extent: 1 slide
Ammophila breviligulata Fern. (American beachgrass), close-up of spikelets (3.83504)
Date: August 1979Creator: Dritz, Ken
Type: Photographic image
Description:Ammophila breviligulata Fern. (American beachgrass), close-up of spikelets
Extent: 1 slide
Ammophila breviligulata Fern. (American beachgrass), spike-like flower with spikelets (flower clusters) (3.83502)
Date: June 1980Creator: Dritz, Ken
Type: Photographic image
Description:Ammophila breviligulata Fern. (American beachgrass), spike-like flower with spikelets (flower clusters)
Extent: 1 slide
Amorpha fruticosa L. (indigo-bush), close-up of inflorescence in bud (3.83538)
Date: December 1980Creator: Dritz, Ken
Type: Photographic image
Description:Amorpha fruticosa L. (indigo-bush), close-up of inflorescence in bud
Extent: 1 slide
Amorpha fruticosa L. (indigo-bush), habit (3.83539)
Date: December 1980Creator: Dritz, Ken
Type: Photographic image
Description:Amorpha fruticosa L. (indigo-bush), habit, leaves and inflorescence;
Extent: 1 slide
Antennaria neglecta Greene (cat's foot), habit (3.99230)
Date: December 1980Creator: Dritz, Ken
Type: Photographic image
Description:Antennaria neglecta Greene (cat's foot), habit, leaves, stems, and white flowers, road, acorn caps, fallen leaves, and other plants in background.
Extent: 1 slide
Antennaria neglecta Greene (cat's foot), habit (3.99231)
Date: December 1980Creator: Dritz, Ken
Type: Photographic image
Description:Antennaria neglecta Greene (cat's foot), habit, leaves, stems, and white flowerheads with grass in background
Extent: 1 slide
Anthemis arvensis var. agrestis (Wallr.) DC (corn chamomile), habit (3.99268)
Date: December 1980Creator: Dritz, Ken
Type: Photographic image
Description:Anthemis arvensis var. agrestis (Wallr.) DC (corn chamomile), habit, white flower, stem, and leaves with other plants in background
Extent: 1 slide
Anthoxanthum odoratum L. (sweet vernal grass), close-up of inflorescence (3.99274)
Date: May 1983Creator: Dritz, Ken
Type: Photographic image
Description:Anthoxanthum odoratum L. (sweet vernal grass), close-up of inflorescence
Extent: 1 slide
Anthoxanthum odoratum L. (sweet vernal grass), habit (3.99275)
Date: May 1983Creator: Dritz, Ken
Type: Photographic image
Description:Anthoxanthum odoratum L. (sweet vernal grass), habit
Extent: 1 slide
Anthriscus caucalis M. Bieb. (burr chervil), close-up of umbel (3.99280)
Date: June 1979Creator: Dritz, Ken
Type: Photographic image
Description:Anthriscus caucalis M. Bieb. (burr chervil), close-up of umbel with white flowers with stem and leaves in background
Extent: 1 slide