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Family

Genus

Common name

Noxious Weed Seed

AOSA Examination List

Species Category

Disseminule/Planting Unit

Shape

Seed length

Seed width

Seed thickness

Color

Texture

Other structures

 

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Salvia leucophylla. Nutlets with the ventral side that has two flat sides separated by a ridge. Salvia leucophylla. Nutlets with the ventral side that has two flat sides separated by a ridge.
Salvia leucophylla
Salvia leucophylla. Nutlets with the ventral side that has two flat sides separated by a ridge.
Salvia mellifera. Nutlets with black reticulations. Salvia mellifera. Nutlets with black reticulations.
Salvia mellifera
Salvia mellifera. Nutlets with black reticulations.
Salvia officinalis. Spherical nutlets with a circular hilum enclosed in a collar.  Salvia officinalis. Spherical nutlets with a circular hilum enclosed in a collar. 
Salvia officinalis
Salvia officinalis. Spherical nutlets with a circular hilum enclosed in a collar. 
From Left to Right: 1. Salvia azurea var. grandiflora 2. Dracocephalum parviflorum 3. Salvia reflexa 4 . Nepeta cataria 5. Monarda punctata 6. Mentha arvensis . Nutlets with a double scar area at the base are as wide as the nutlet.  From Left to Right: 1. Salvia azurea var. grandiflora 2. Dracocephalum parviflorum 3. Salvia reflexa 4. Nepeta cataria 5. Monarda punctata 6. Mentha arvensis. Nutlets with a double scar area at the base are as wide as the nutlet. 
Salvia reflexa
From Left to Right: 1. Salvia azurea var. grandiflora 2. Dracocephalum parviflorum 3. Salvia reflexa 4. Nepeta cataria 5. Monarda punctata 6. Mentha arvensis. Nutlets with a double scar area at the base are as wide as the nutlet. 

Salvia splendens . Nutlets with a lumpy apex and a hilum on a truncated base. Salvia splendens. Nutlets with a lumpy apex and a hilum on a truncated base.
Salvia splendens
Salvia splendens. Nutlets with a lumpy apex and a hilum on a truncated base.
Salvia tiliifolia. Nutlets with rounded dorsal and ventral sides. Salvia tiliifolia. Nutlets with rounded dorsal and ventral sides.
Salvia tiliifolia
Salvia tiliifolia. Nutlets with rounded dorsal and ventral sides.
Salvinia molesta . Photo by Julia Scher, USDA-APHIS-PPQ. Salvinia molesta. Photo by Julia Scher, USDA-APHIS-PPQ.
Salvinia molesta
Salvinia molesta. Photo by Julia Scher, USDA-APHIS-PPQ.
Salvinia molesta . Photo by Julia Scher, USDA-APHIS-PPQ. Salvinia molesta. Photo by Julia Scher, USDA-APHIS-PPQ.
Salvinia molesta
Salvinia molesta. Photo by Julia Scher, USDA-APHIS-PPQ.

Salvinia molesta . Photo by Julia Scher, USDA-APHIS-PPQ. Salvinia molesta. Photo by Julia Scher, USDA-APHIS-PPQ.
Salvinia molesta
Salvinia molesta. Photo by Julia Scher, USDA-APHIS-PPQ.
Salvinia molesta . Photo by Julia Scher, USDA-APHIS-PPQ. Salvinia molesta. Photo by Julia Scher, USDA-APHIS-PPQ.
Salvinia molesta
Salvinia molesta. Photo by Julia Scher, USDA-APHIS-PPQ.
Salvinia molesta . Photo by Julia Scher, USDA-APHIS-PPQ. Salvinia molesta. Photo by Julia Scher, USDA-APHIS-PPQ.
Salvinia molesta
Salvinia molesta. Photo by Julia Scher, USDA-APHIS-PPQ.
Sambucus nigra ssp. cerulea. True seeds with irregular transverse ribs. Sambucus nigra ssp. cerulea. True seeds with irregular transverse ribs.
Sambucus nigra subsp. cerulea
Sambucus nigra ssp. cerulea. True seeds with irregular transverse ribs.

Sanguisorba minor. Achenes with jagged and complete longitudinal ridges.  Sanguisorba minor. Achenes with jagged and complete longitudinal ridges. 
Sanguisorba minor
Sanguisorba minor. Achenes with jagged and complete longitudinal ridges. 
Sanvitalia procumbens.  Achenes with wings that have vertical cuts and are attached to the margin, but not at the pappus crown.  Sanvitalia procumbens.  Achenes with wings that have vertical cuts and are attached to the margin, but not at the pappus crown. 
Sanvitalia procumbens
Sanvitalia procumbens.  Achenes with wings that have vertical cuts and are attached to the margin, but not at the pappus crown. 
Saponaria ocymoides. True seeds with a hilum that is on raised tissue on the margin. Saponaria ocymoides. True seeds with a hilum that is on raised tissue on the margin.
Saponaria ocymoides
Saponaria ocymoides. True seeds with a hilum that is on raised tissue on the margin.
Saponaria officinalis. True seeds with very well-organized rows of tubercles that originate and end at the hilum. Saponaria officinalis. True seeds with very well-organized rows of tubercles that originate and end at the hilum.
Saponaria officinalis
Saponaria officinalis. True seeds with very well-organized rows of tubercles that originate and end at the hilum.

Sarcobatus vermiculatus.  The seed unit is found mostly as a complete flower with attached sepal lobes; the term nutlet is used because the seed is enclosed in a hard fruit coat.  Sarcobatus vermiculatus. The seed unit is found mostly as a complete flower with attached sepal lobes; the term nutlet is used because the seed is enclosed in a hard fruit coat. 
Sarcobatus vermiculatus
Sarcobatus vermiculatus. The seed unit is found mostly as a complete flower with attached sepal lobes; the term nutlet is used because the seed is enclosed in a hard fruit coat. 
Satureja hortensis. Nutlets that are broader near the base. Satureja hortensis. Nutlets that are broader near the base.
Satureja hortensis
Satureja hortensis. Nutlets that are broader near the base.
Satureja hortensis. Nutlets that are broader near the base because of the attachment area. Satureja hortensis. Nutlets that are broader near the base because of the attachment area.
Satureja hortensis
Satureja hortensis. Nutlets that are broader near the base because of the attachment area.
Sixalix atropurpurea. Achenes with a papery surface often flake off, and the pistil may stay attached. Sixalix atropurpurea. Achenes with a papery surface often flake off, and the pistil may stay attached.
Scabiosa atropurpurea
Sixalix atropurpurea. Achenes with a papery surface often flake off, and the pistil may stay attached.

Scabiosa. Achenes with longitudinal holes in the calyx lobes. Scabiosa. Achenes with longitudinal holes in the calyx lobes.
Scabiosa sp.
Scabiosa. Achenes with longitudinal holes in the calyx lobes.
Schedonorus arundinaceus. Florets with a thick caryopsis that has a dark colored pericarp. Schedonorus arundinaceus. Florets with a thick caryopsis that has a dark colored pericarp.
Schedonorus arundinaceus
Schedonorus arundinaceus. Florets with a thick caryopsis that has a dark colored pericarp.
Schedonorus arundinaceus. Awnless florets. Schedonorus arundinaceus. Awnless florets.
Schedonorus arundinaceus
Schedonorus arundinaceus. Awnless florets.
From Left to Right: 1. Schedonorus arundinacea 2. Schedonorus pratensis . From Left to Right: 1. Schedonorus arundinacea 2. Schedonorus pratensis .
Schedonorus arundinaceus
From Left to Right: 1. Schedonorus arundinacea 2. Schedonorus pratensis .

Schedonorus pratensis.  The caryopsis pericarp is lighter brown. The surface texture is smooth and glabrous. Schedonorus pratensis. The caryopsis pericarp is lighter brown. The surface texture is smooth and glabrous.
Schedonorus pratensis
Schedonorus pratensis. The caryopsis pericarp is lighter brown. The surface texture is smooth and glabrous.
Schedonorus pratensis. Florets with a light brown caryopsis. Schedonorus pratensis. Florets with a light brown caryopsis.
Schedonorus pratensis
Schedonorus pratensis. Florets with a light brown caryopsis.
From Left to Right: 1. Schedonorus arundinacea 2. Schedonorus pratensis . From Left to Right: 1. Schedonorus arundinacea 2. Schedonorus pratensis.
Schedonorus pratensis
From Left to Right: 1. Schedonorus arundinacea 2. Schedonorus pratensis.
Schizachyrium scoparium. Spikelets with an awn from the lemma protruding out through the tips of the glumes.  Schizachyrium scoparium. Spikelets with an awn from the lemma protruding out through the tips of the glumes. 
Schizachyrium scoparium
Schizachyrium scoparium. Spikelets with an awn from the lemma protruding out through the tips of the glumes. 

From Left to Right: 1. Andropogon gerardii 2. Andropogon hallii 3. Sorghastrum nutans 4. Schizachyrium scoparium 5, Bothriochloa ischaemum . From Left to Right: 1. Andropogon gerardii 2. Andropogon hallii 3. Sorghastrum nutans 4. Schizachyrium scoparium 5, Bothriochloa ischaemum.
Schizachyrium scoparium
From Left to Right: 1. Andropogon gerardii 2. Andropogon hallii 3. Sorghastrum nutans 4. Schizachyrium scoparium 5, Bothriochloa ischaemum.
Schizanthus pinnatus.  True seeds with an inconspicuous hilum on the ventral side. Schizanthus pinnatus. True seeds with an inconspicuous hilum on the ventral side.
Schizanthus pinnatus
Schizanthus pinnatus. True seeds with an inconspicuous hilum on the ventral side.
Schoenoplectus acutus. Achenes with the base of the style remaining on the apical end. Schoenoplectus acutus. Achenes with the base of the style remaining on the apical end.
Schoenoplectus acutus
Schoenoplectus acutus. Achenes with the base of the style remaining on the apical end.
From Left to Right:  1. Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus tabernaemontani .   Schoenoplectus americanus is the lightest brown and largest of the three species shown in the photo. Its shape approaches a rounded triangle. From Left to Right:  1. Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus tabernaemontani.  Schoenoplectus americanus is the lightest brown and largest of the three species shown in the photo. Its shape approaches a rounded triangle.
Schoenoplectus americanus
From Left to Right:  1. Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus tabernaemontani.  Schoenoplectus americanus is the lightest brown and largest of the three species shown in the photo. Its shape approaches a rounded triangle.

Schoenoplectus tabernaemontani. Achenes with two rounded sides and bristled hairs from the base. Schoenoplectus tabernaemontani. Achenes with two rounded sides and bristled hairs from the base.
Schoenoplectus tabernaemontani
Schoenoplectus tabernaemontani. Achenes with two rounded sides and bristled hairs from the base.
From Left to Right:  1. Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus tabernaemontani .  Schoenoplectus tabernaemontani is the smallest species shown in the photo. Achenes with straplike appendages from the base.  From Left to Right:  1. Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus tabernaemontani. Schoenoplectus tabernaemontani is the smallest species shown in the photo. Achenes with straplike appendages from the base. 
Schoenoplectus tabernaemontani
From Left to Right:  1. Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus tabernaemontani. Schoenoplectus tabernaemontani is the smallest species shown in the photo. Achenes with straplike appendages from the base. 
Scirpus atrovirens. Achenes that have one totally flat side and a side with two flat surfaces separated by a ridge. Scirpus atrovirens. Achenes that have one totally flat side and a side with two flat surfaces separated by a ridge.
Scirpus atrovirens
Scirpus atrovirens. Achenes that have one totally flat side and a side with two flat surfaces separated by a ridge.
Scirpus cyperinus. Three-sided achenes with a ridge between the sides.  Scirpus cyperinus. Three-sided achenes with a ridge between the sides. 
Scirpus cyperinus
Scirpus cyperinus. Three-sided achenes with a ridge between the sides. 

Scirpus microcarpus. Achenes with two rounded sides with a ridge for a margin. Scirpus microcarpus. Achenes with two rounded sides with a ridge for a margin.
Scirpus microcarpus
Scirpus microcarpus. Achenes with two rounded sides with a ridge for a margin.
Scirpus pendulus. Achenes that often have smooth hairs from the base. Scirpus pendulus. Achenes that often have smooth hairs from the base.
Scirpus pendulus
Scirpus pendulus. Achenes that often have smooth hairs from the base.
Scirpus pendulus. Achenes that have three sides with a ridge between the sides.. Scirpus pendulus. Achenes that have three sides with a ridge between the sides..
Scirpus pendulus
Scirpus pendulus. Achenes that have three sides with a ridge between the sides..
Scolymus hispanicus. Achenes enclosed by a winged receptacle.  Scolymus hispanicus. Achenes enclosed by a winged receptacle. 
Scolymus hispanicus
Scolymus hispanicus. Achenes enclosed by a winged receptacle.