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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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Prosopis ruscifolia. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis ruscifolia. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis ruscifolia
Prosopis ruscifolia. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis ruscifolia. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis ruscifolia. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis ruscifolia
Prosopis ruscifolia. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis sericantha . True seeds with a circular line between the margin and center. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis sericantha. True seeds with a circular line between the margin and center. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis sericantha
Prosopis sericantha. True seeds with a circular line between the margin and center. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis sericantha . True seeds with a protruding hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis sericantha. True seeds with a protruding hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis sericantha
Prosopis sericantha. True seeds with a protruding hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.

Prosopis sericantha . True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis sericantha. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis sericantha
Prosopis sericantha. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis strombulifera. True seeds with a yellow circular line between the margin and center. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis strombulifera. True seeds with a yellow circular line between the margin and center. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis strombulifera
Prosopis strombulifera. True seeds with a yellow circular line between the margin and center. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis strombulifera. True seeds with a protruding hilum. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis strombulifera. True seeds with a protruding hilum. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis strombulifera
Prosopis strombulifera. True seeds with a protruding hilum. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis strombulifera. True seeds in oddly-shaped pods. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis strombulifera. True seeds in oddly-shaped pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis strombulifera
Prosopis strombulifera. True seeds in oddly-shaped pods. Photo by Julia Scher, USDA-APHIS-PPQ.

Prosopis strombulifera. True seeds in oddly-shaped pods. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis strombulifera. True seeds in oddly-shaped pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis strombulifera
Prosopis strombulifera. True seeds in oddly-shaped pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata
Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata
Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata
Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ.

Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata
Prosopis torquata. True seeds with the hilum at the base and are a small lateral protrusion. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis torquata. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata
Prosopis torquata. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ. Prosopis torquata. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prosopis torquata
Prosopis torquata. True seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.
Prunella vulgaris. Nutlets with brown with dark brown lines.  Prunella vulgaris. Nutlets with brown with dark brown lines. 
Prunella vulgaris
Prunella vulgaris. Nutlets with brown with dark brown lines. 

Prunus minutiflora . Pits that are a seed enclosed in the inner part (endocarp) of the fruit coat. Prunus minutiflora. Pits that are a seed enclosed in the inner part (endocarp) of the fruit coat.
Prunus minutiflora
Prunus minutiflora. Pits that are a seed enclosed in the inner part (endocarp) of the fruit coat.
Prunus virginiana. Pits that are seeds enclosed in the hard inner part (endocarp) of the fruit coat. Prunus virginiana. Pits that are seeds enclosed in the hard inner part (endocarp) of the fruit coat.
Prunus virginiana
Prunus virginiana. Pits that are seeds enclosed in the hard inner part (endocarp) of the fruit coat.
Psathyrostachys juncea. Florets with all parts have some degree of pubescence. Psathyrostachys juncea. Florets with all parts have some degree of pubescence.
Psathyrostachys juncea
Psathyrostachys juncea. Florets with all parts have some degree of pubescence.
Pseudoroegneria spicata . Florets with strong awns and a long, V-shaped rachilla. Pseudoroegneria spicata. Florets with strong awns and a long, V-shaped rachilla.
Pseudoroegneria spicata
Pseudoroegneria spicata. Florets with strong awns and a long, V-shaped rachilla.

Pseudoroegneria spicata (Pursh) Á. Löve ssp. inermis . Florets with double gray transverse lines on the lemma. Pseudoroegneria spicata (Pursh) Á. Löve ssp. inermis. Florets with double gray transverse lines on the lemma.
Pseudoroegneria spicata subsp. inermis
Pseudoroegneria spicata (Pursh) Á. Löve ssp. inermis. Florets with double gray transverse lines on the lemma.
Pseudotsuga menziesii. True seeds that are enclosed in wing fragments that are irregularly triangular.  Pseudotsuga menziesii. True seeds that are enclosed in wing fragments that are irregularly triangular. 
Pseudotsuga menziesii
Pseudotsuga menziesii. True seeds that are enclosed in wing fragments that are irregularly triangular. 
Psoralidium tenuiflorum. True seeds that are borne singly in a pod that is white with dark spots. Psoralidium tenuiflorum. True seeds that are borne singly in a pod that is white with dark spots.
Psoralidium tenuiflorum
Psoralidium tenuiflorum. True seeds that are borne singly in a pod that is white with dark spots.
Puccinellia distans. Florets with a dark brown caryopsis with a striate surface.  Puccinellia distans. Florets with a dark brown caryopsis with a striate surface. 
Puccinellia distans
Puccinellia distans. Florets with a dark brown caryopsis with a striate surface. 

Pueraria montana  var. lobata  True seeds with the hilum on the long margin, with a white corky collar.  Pueraria montana var. lobata True seeds with the hilum on the long margin, with a white corky collar. 
Pueraria montana var. lobata
Pueraria montana var. lobata True seeds with the hilum on the long margin, with a white corky collar. 
Pueraria phaseoloides. Seeds with a white collar around the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Pueraria phaseoloides. Seeds with a white collar around the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Pueraria phaseoloides
Pueraria phaseoloides. Seeds with a white collar around the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Pulsatilla patens  ssp. patens.  Long, narrow apical style. Pulsatilla patens ssp. patens. Long, narrow apical style.
Pulsatilla patens subsp. patens
Pulsatilla patens ssp. patens. Long, narrow apical style.
Anemone pulsatilla.  Apex has long awn with coils. The base has a sharp and curved point. Anemone pulsatilla. Apex has long awn with coils. The base has a sharp and curved point.
Pulsatilla vulgaris
Anemone pulsatilla. Apex has long awn with coils. The base has a sharp and curved point.

Purshia mexicana. Achenes with many large longitudinal ribs. Purshia mexicana. Achenes with many large longitudinal ribs.
Purshia mexicana
Purshia mexicana. Achenes with many large longitudinal ribs.
Purshia mexicana. Achenes with a segment of the style that remains attached to the apex.  Purshia mexicana. Achenes with a segment of the style that remains attached to the apex. 
Purshia mexicana
Purshia mexicana. Achenes with a segment of the style that remains attached to the apex. 
Purshia tridentata. Achenes with a pointed basal end and a round apex. Purshia tridentata. Achenes with a pointed basal end and a round apex.
Purshia tridentata
Purshia tridentata. Achenes with a pointed basal end and a round apex.
Pycnanthemum flexuosum. Nutlets that are rounded on the dorsal side and flat on the ventral side.  Pycnanthemum flexuosum. Nutlets that are rounded on the dorsal side and flat on the ventral side. 
Pycnanthemum flexuosum
Pycnanthemum flexuosum. Nutlets that are rounded on the dorsal side and flat on the ventral side. 

Pycnanthemum pilosum. Nutlets with a large V-shaped attachment area at the base.  Pycnanthemum pilosum. Nutlets with a large V-shaped attachment area at the base. 
Pycnanthemum pilosum
Pycnanthemum pilosum. Nutlets with a large V-shaped attachment area at the base. 
From Left to Right: 1. Quincula lobata 2 . Solanum rostratum.  True seeds with a honeycomb surface, and the margin is very deeply indented but rounded laterally.   From Left to Right: 1. Quincula lobata 2. Solanum rostratum. True seeds with a honeycomb surface, and the margin is very deeply indented but rounded laterally.  
Quincula lobata
From Left to Right: 1. Quincula lobata 2. Solanum rostratum. True seeds with a honeycomb surface, and the margin is very deeply indented but rounded laterally.  
Quincula lobata. Lenticular and lumpy true seeds. Quincula lobata. Lenticular and lumpy true seeds.
Quincula lobata
Quincula lobata. Lenticular and lumpy true seeds.
Ranunculus abortivus. True seeds with an indented ridge on the perimeter. Ranunculus abortivus. True seeds with an indented ridge on the perimeter.
Ranunculus abortivus
Ranunculus abortivus. True seeds with an indented ridge on the perimeter.

Ranunculus abortivus. True seeds that are lenticular by being convex on the two sides. The hilum is located on a slight rise on the seed edge.  Ranunculus abortivus. True seeds that are lenticular by being convex on the two sides. The hilum is located on a slight rise on the seed edge. 
Ranunculus abortivus
Ranunculus abortivus. True seeds that are lenticular by being convex on the two sides. The hilum is located on a slight rise on the seed edge. 
Ranunculus asiaticus. The dark brown seed is small and quite visible inside the fruit walls.  Ranunculus asiaticus. The dark brown seed is small and quite visible inside the fruit walls. 
Ranunculus asiaticus
Ranunculus asiaticus. The dark brown seed is small and quite visible inside the fruit walls. 
Raphanus raphanistrum. Pod segments that break up at maturity on the constrictions between the seeds into cylindrical segments. Raphanus raphanistrum. Pod segments that break up at maturity on the constrictions between the seeds into cylindrical segments.
Raphanus raphanistrum
Raphanus raphanistrum. Pod segments that break up at maturity on the constrictions between the seeds into cylindrical segments.
Raphanus sativus. True seed with spongy pods that break open easily in conditioning, and the seed unit is the hulled seed. Raphanus sativus. True seed with spongy pods that break open easily in conditioning, and the seed unit is the hulled seed.
Raphanus sativus
Raphanus sativus. True seed with spongy pods that break open easily in conditioning, and the seed unit is the hulled seed.