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Common name

Noxious Weed Seed

AOSA Examination List

Species Category

Disseminule/Planting Unit

Shape

Seed length

Seed width

Seed thickness

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Papaver nudicaule. True seeds with longitudinal lines the length of the seed.  Papaver nudicaule. True seeds with longitudinal lines the length of the seed. 
Papaver nudicaule
Papaver nudicaule. True seeds with longitudinal lines the length of the seed. 
Papaver nudicaule. True seeds that are semi-coiled obovate (paisley) with a shallow reticulum with irregular interspaces. Papaver nudicaule. True seeds that are semi-coiled obovate (paisley) with a shallow reticulum with irregular interspaces.
Papaver nudicaule
Papaver nudicaule. True seeds that are semi-coiled obovate (paisley) with a shallow reticulum with irregular interspaces.
Papaver orientale. Dark brown true seeds with the hilum on the inside curve. Papaver orientale. Dark brown true seeds with the hilum on the inside curve.
Papaver orientale
Papaver orientale. Dark brown true seeds with the hilum on the inside curve.
Papaver rhoeas. True seeds with a shallow reticulum with small stippled interspaces.  Papaver rhoeas. True seeds with a shallow reticulum with small stippled interspaces. 
Papaver rhoeas
Papaver rhoeas. True seeds with a shallow reticulum with small stippled interspaces. 

Papaver rhoeas. True seeds with a shallow reticulum that has a pattern of unilateral interspaces that vary from round to square. Papaver rhoeas. True seeds with a shallow reticulum that has a pattern of unilateral interspaces that vary from round to square.
Papaver rhoeas
Papaver rhoeas. True seeds with a shallow reticulum that has a pattern of unilateral interspaces that vary from round to square.
Parkinsonia aculeata. True seeds with mottling that have both longitudinal lines and small flecks. Parkinsonia aculeata. True seeds with mottling that have both longitudinal lines and small flecks.
Parkinsonia aculeata
Parkinsonia aculeata. True seeds with mottling that have both longitudinal lines and small flecks.
Parthenium integrifolium. Achenes enclosed within attachments. Parthenium integrifolium. Achenes enclosed within attachments.
Parthenium integrifolium
Parthenium integrifolium. Achenes enclosed within attachments.
Pascopyrum smithii. Scurfy and sparsely pubescent florets with hairs on the lateral sides of the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Pascopyrum smithii. Scurfy and sparsely pubescent florets with hairs on the lateral sides of the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Pascopyrum smithii
Pascopyrum smithii. Scurfy and sparsely pubescent florets with hairs on the lateral sides of the callus. Photo by Julia Scher, USDA-APHIS-PPQ.

Pascopyrum smithii. Scurfy and sparsely pubescent florets with hairs on the lateral sides of the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Pascopyrum smithii. Scurfy and sparsely pubescent florets with hairs on the lateral sides of the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Pascopyrum smithii
Pascopyrum smithii. Scurfy and sparsely pubescent florets with hairs on the lateral sides of the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Pascopyrum smithii. Rachilla V-shaped at the sinus.  Pascopyrum smithii. Rachilla V-shaped at the sinus. 
Pascopyrum smithii
Pascopyrum smithii. Rachilla V-shaped at the sinus. 
Paspalum boscianum . Smooth spikelets with a glabrous central vein. Paspalum boscianum. Smooth spikelets with a glabrous central vein.
Paspalum boscianum
Paspalum boscianum. Smooth spikelets with a glabrous central vein.
From Left to Right: 1. Paspalum boscianum  2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum . The spikelet is missing the first glume. From Left to Right: 1. Paspalum boscianum 2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum. The spikelet is missing the first glume.
Paspalum boscianum
From Left to Right: 1. Paspalum boscianum 2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum. The spikelet is missing the first glume.

Paspalum dilatatum. The glume and sterile Lemma are finely pubescent along the top and sides.  Paspalum dilatatum. The glume and sterile Lemma are finely pubescent along the top and sides. 
Paspalum dilatatum
Paspalum dilatatum. The glume and sterile Lemma are finely pubescent along the top and sides. 
From Left to Right: 1. Paspalum scrobiculatum  2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var . stramineum . Flattish spikelets. From Left to Right: 1. Paspalum scrobiculatum 2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum. Flattish spikelets.
Paspalum dilatatum
From Left to Right: 1. Paspalum scrobiculatum 2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum. Flattish spikelets.
Paspalum laeve . Spikelets with a missing first glume. Paspalum laeve. Spikelets with a missing first glume.
Paspalum laeve
Paspalum laeve. Spikelets with a missing first glume.
From Left to Right: 1. Paspalum scrobiculatum  2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var . stramineum . Spikelets are strongly arched with nerves in distinct lines. From Left to Right: 1. Paspalum scrobiculatum 2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum. Spikelets are strongly arched with nerves in distinct lines.
Paspalum laeve
From Left to Right: 1. Paspalum scrobiculatum 2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum. Spikelets are strongly arched with nerves in distinct lines.

Paspalum notatum . Spikelets are smooth and coarsely wrinkled. Paspalum notatum. Spikelets are smooth and coarsely wrinkled.
Paspalum notatum
Paspalum notatum. Spikelets are smooth and coarsely wrinkled.
From Left to Right: 1. Paspalum scrobiculatum  2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum . Spikelets are strongly arched with a very weak central nerve. From Left to Right: 1. Paspalum scrobiculatum 2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum. Spikelets are strongly arched with a very weak central nerve.
Paspalum notatum
From Left to Right: 1. Paspalum scrobiculatum 2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum. Spikelets are strongly arched with a very weak central nerve.
Paspalum scrobiciulatum . Florets with fragments of the glumes are often attached to the base of the floret. Paspalum scrobiciulatum. Florets with fragments of the glumes are often attached to the base of the floret.
Paspalum scrobiculatum
Paspalum scrobiciulatum. Florets with fragments of the glumes are often attached to the base of the floret.
Paspalum scrobiciulatum . Florets with fragments of the glumes are often attached to the base of the floret. Paspalum scrobiciulatum. Florets with fragments of the glumes are often attached to the base of the floret.
Paspalum scrobiculatum
Paspalum scrobiciulatum. Florets with fragments of the glumes are often attached to the base of the floret.

Paspalum scrobiciulatum . Florets with fragments of the glumes are often attached to the base of the floret. Paspalum scrobiciulatum. Florets with fragments of the glumes are often attached to the base of the floret.
Paspalum scrobiculatum
Paspalum scrobiciulatum. Florets with fragments of the glumes are often attached to the base of the floret.
Paspalum scrobiciulatum . Florets with fragments of the glumes are often attached to the base of the floret. Paspalum scrobiciulatum. Florets with fragments of the glumes are often attached to the base of the floret.
Paspalum scrobiculatum
Paspalum scrobiciulatum. Florets with fragments of the glumes are often attached to the base of the floret.
Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ. Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ.
Paspalum scrobiculatum
Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ.
Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ. Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ.
Paspalum scrobiculatum
Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ.

Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ. Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ.
Paspalum scrobiculatum
Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ.
Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ. Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ.
Paspalum scrobiculatum
Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ.
Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ. Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ.
Paspalum scrobiculatum
Paspalum scrobiciulatum. Florets with papery glumes are often attached. Photo by Julia Scher, USDA-APHIS-PPQ.
Paspalum setaceum var. stramineum . Smooth seeds with only a trace of a central nerve. Paspalum setaceum var. stramineum. Smooth seeds with only a trace of a central nerve.
Paspalum setaceum
Paspalum setaceum var. stramineum. Smooth seeds with only a trace of a central nerve.

From Left to Right: 1. Paspalum scrobiculatum  2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum . Has tight-fitting glumes that just cover the floret. From Left to Right: 1. Paspalum scrobiculatum 2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum. Has tight-fitting glumes that just cover the floret.
Paspalum setaceum
From Left to Right: 1. Paspalum scrobiculatum 2. Paspalum dilatatum 3. Paspalum laeve 4. Paspalum notatum 5. Paspalum setaceum var. stramineum. Has tight-fitting glumes that just cover the floret.
Passiflora bicornis. True seeds with a rough surface that is covered with scabrous material.  Passiflora bicornis. True seeds with a rough surface that is covered with scabrous material. 
Passiflora bicornis
Passiflora bicornis. True seeds with a rough surface that is covered with scabrous material. 
Passiflora incarnata. True seeds with interspaces that are sometimes brown. Passiflora incarnata. True seeds with interspaces that are sometimes brown.
Passiflora incarnata
Passiflora incarnata. True seeds with interspaces that are sometimes brown.
Passiflora tripartita var. mollissima. True seeds that are shiny with a strong reticulum, with round interspaces.  Passiflora tripartita var. mollissima. True seeds that are shiny with a strong reticulum, with round interspaces. 
Passiflora tripartita var. mollissima
Passiflora tripartita var. mollissima. True seeds that are shiny with a strong reticulum, with round interspaces. 

Pastinaca sativa.  Mericarps with faint longitudinal lines. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Pastinaca sativa. Mericarps with faint longitudinal lines. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Pastinaca sativa
Pastinaca sativa. Mericarps with faint longitudinal lines. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Pavonia lasiopetala.  True seeds with a sharp ridge following the center of the rounded part of the margin.  Pavonia lasiopetala. True seeds with a sharp ridge following the center of the rounded part of the margin. 
Pavonia lasiopetala
Pavonia lasiopetala. True seeds with a sharp ridge following the center of the rounded part of the margin. 
Pediomelum esculentum. Seeds are borne singly in a pod that is white with dark spots. Pediomelum esculentum. Seeds are borne singly in a pod that is white with dark spots.
Pediomelum esculentum
Pediomelum esculentum. Seeds are borne singly in a pod that is white with dark spots.
Peganum harmala. True seeds with tubercles and stipples present.  Peganum harmala. True seeds with tubercles and stipples present. 
Peganum harmala
Peganum harmala. True seeds with tubercles and stipples present. 

Peganum harmala. True seeds that are sometimes bent.  Peganum harmala. True seeds that are sometimes bent. 
Peganum harmala
Peganum harmala. True seeds that are sometimes bent. 
Pelargonium × hortorum. True seeds with a concave ventral side that contains a central radicle lobe. Pelargonium × hortorum. True seeds with a concave ventral side that contains a central radicle lobe.
Pelargonium ×hortorum
Pelargonium × hortorum. True seeds with a concave ventral side that contains a central radicle lobe.
Pelargonium sp. The distal end of the segment has a long, coiled awn.  Pelargonium sp. The distal end of the segment has a long, coiled awn. 
Pelargonium sp.
Pelargonium sp. The distal end of the segment has a long, coiled awn. 
Pennisetum ciliare. Fascicles that contain many spikelets. Pennisetum ciliare. Fascicles that contain many spikelets.
Pennisetum ciliare
Pennisetum ciliare. Fascicles that contain many spikelets.