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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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Other structures

 

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Pennisetum clandestinum. Caryopses.  Pennisetum clandestinum. Caryopses. 
Pennisetum clandestinum
Pennisetum clandestinum. Caryopses. 
Pennisetum clandestinum. Caryopses with florets.  Pennisetum clandestinum. Caryopses with florets. 
Pennisetum clandestinum
Pennisetum clandestinum. Caryopses with florets. 
Pennisetum clandestinum. Caryopses with the embryo on the ventral side at the basal end. Pennisetum clandestinum. Caryopses with the embryo on the ventral side at the basal end.
Pennisetum clandestinum
Pennisetum clandestinum. Caryopses with the embryo on the ventral side at the basal end.
Pennisetum clandestinum. Caryopses with the embryo on the ventral side at the basal end. Photo by Julia Scher, USDA-APHIS-PPQ. Pennisetum clandestinum. Caryopses with the embryo on the ventral side at the basal end. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum clandestinum
Pennisetum clandestinum. Caryopses with the embryo on the ventral side at the basal end. Photo by Julia Scher, USDA-APHIS-PPQ.

Pennisetum clandestinum. Florets. Photo by Julia Scher, USDA-APHIS-PPQ. Pennisetum clandestinum. Florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum clandestinum
Pennisetum clandestinum. Florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum clandestinum. Florets. Photo by Julia Scher, USDA-APHIS-PPQ. Pennisetum clandestinum. Florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum clandestinum
Pennisetum clandestinum. Florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum glaucum. Commercial seeds consist almost entirely of hulled caryopses, with many damaged by conditioning. Pennisetum glaucum. Commercial seeds consist almost entirely of hulled caryopses, with many damaged by conditioning.
Pennisetum glaucum
Pennisetum glaucum. Commercial seeds consist almost entirely of hulled caryopses, with many damaged by conditioning.
Pennisteum spp. (most likely P. glaucum ). Caryopses. Pennisteum spp. (most likely P. glaucum). Caryopses.
Pennisetum glaucum
Pennisteum spp. (most likely P. glaucum). Caryopses.

Pennisetum polystachion. Unconditioned seeds with feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Pennisetum polystachion. Unconditioned seeds with feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum polystachion
Pennisetum polystachion. Unconditioned seeds with feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum polystachion. Florets with a caryopsis that has an inconspicuous embryo. Photo by Julia Scher, USDA-APHIS-PPQ. Pennisetum polystachion. Florets with a caryopsis that has an inconspicuous embryo. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum polystachion
Pennisetum polystachion. Florets with a caryopsis that has an inconspicuous embryo. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum polystachion. Florets. Photo by Julia Scher, USDA-APHIS-PPQ. Pennisetum polystachion. Florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum polystachion
Pennisetum polystachion. Florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum polystachion. Unconditioned seeds with feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Pennisetum polystachion. Unconditioned seeds with feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum polystachion
Pennisetum polystachion. Unconditioned seeds with feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.

Pennisetum polystachion. Unconditioned seeds with feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Pennisetum polystachion. Unconditioned seeds with feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum polystachion
Pennisetum polystachion. Unconditioned seeds with feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum polystachion. Florets with a smooth, shiny lemma. Photo by Julia Scher, USDA-APHIS-PPQ. Pennisetum polystachion. Florets with a smooth, shiny lemma. Photo by Julia Scher, USDA-APHIS-PPQ.
Pennisetum polystachion
Pennisetum polystachion. Florets with a smooth, shiny lemma. Photo by Julia Scher, USDA-APHIS-PPQ.
Penstemon ambiguus. True seeds with flat surfaces that are joined by brown winged ridges.  Penstemon ambiguus. True seeds with flat surfaces that are joined by brown winged ridges. 
Penstemon ambiguus
Penstemon ambiguus. True seeds with flat surfaces that are joined by brown winged ridges. 
Penstemon angustifolius. True seeds with a ridge between the flat surfaces. Penstemon angustifolius. True seeds with a ridge between the flat surfaces.
Penstemon angustifolius
Penstemon angustifolius. True seeds with a ridge between the flat surfaces.

Penstemon angustifolius. True seeds with a wedged cross-section. Penstemon angustifolius. True seeds with a wedged cross-section.
Penstemon angustifolius
Penstemon angustifolius. True seeds with a wedged cross-section.
Penstemon barbatus . True seeds with very rough stipples and have various shades of brown. Penstemon barbatus. True seeds with very rough stipples and have various shades of brown.
Penstemon barbatus
Penstemon barbatus. True seeds with very rough stipples and have various shades of brown.
Penstemon barbatus . True seeds with very rough stipples and have various shades of brown. Penstemon barbatus. True seeds with very rough stipples and have various shades of brown.
Penstemon barbatus
Penstemon barbatus. True seeds with very rough stipples and have various shades of brown.
Penstemon digitalis. True seeds with a white outer coat and a black inner coat. Penstemon digitalis. True seeds with a white outer coat and a black inner coat.
Penstemon digitalis
Penstemon digitalis. True seeds with a white outer coat and a black inner coat.

Penstemon eatonii. Rough and stippled true seeds that are irregularly kidney-shaped. Penstemon eatonii. Rough and stippled true seeds that are irregularly kidney-shaped.
Penstemon eatonii
Penstemon eatonii. Rough and stippled true seeds that are irregularly kidney-shaped.
Penstemon glaber. True seeds with some ridges between the flat surfaces. Penstemon glaber. True seeds with some ridges between the flat surfaces.
Penstemon glaber
Penstemon glaber. True seeds with some ridges between the flat surfaces.
Penstemon grandiflorus. True seeds with some wavy shapes on the flat surfaces. Penstemon grandiflorus. True seeds with some wavy shapes on the flat surfaces.
Penstemon grandiflorus
Penstemon grandiflorus. True seeds with some wavy shapes on the flat surfaces.
Penstemon grandiflorus. Dark to medium brown true seeds. Penstemon grandiflorus. Dark to medium brown true seeds.
Penstemon grandiflorus
Penstemon grandiflorus. Dark to medium brown true seeds.

Penstemon palmeri. True seeds with weak flat surfaces. Penstemon palmeri. True seeds with weak flat surfaces.
Penstemon palmeri
Penstemon palmeri. True seeds with weak flat surfaces.
Penstemon rydbergii. True seeds that are black with brown between the flat surfaces.  Penstemon rydbergii. True seeds that are black with brown between the flat surfaces. 
Penstemon rydbergii
Penstemon rydbergii. True seeds that are black with brown between the flat surfaces. 
Penstemon spectabilis. Black true seeds with a very irregular shape. Penstemon spectabilis. Black true seeds with a very irregular shape.
Penstemon spectabilis
Penstemon spectabilis. Black true seeds with a very irregular shape.
Penstemon strictus. True seeds with a surface texture that appears crusty. Penstemon strictus. True seeds with a surface texture that appears crusty.
Penstemon strictus
Penstemon strictus. True seeds with a surface texture that appears crusty.

Penstemon virgatus. True seeds are often an irregular triangular shape. Penstemon virgatus. True seeds are often an irregular triangular shape.
Penstemon virgatus
Penstemon virgatus. True seeds are often an irregular triangular shape.
Perilla frutescens. Nutlets with a circular collar around the basal end. Perilla frutescens. Nutlets with a circular collar around the basal end.
Perilla frutescens
Perilla frutescens. Nutlets with a circular collar around the basal end.
Perilla frutescens. Nutlets with brown and black reticulations. Perilla frutescens. Nutlets with brown and black reticulations.
Perilla frutescens
Perilla frutescens. Nutlets with brown and black reticulations.
Polygonum amphibium var. emersum . Achenes with remnants of floral parts at the base and a pointed apex.  Polygonum amphibium var. emersum. Achenes with remnants of floral parts at the base and a pointed apex. 
Persicaria amphibiium var. emersum
Polygonum amphibium var. emersum. Achenes with remnants of floral parts at the base and a pointed apex. 

Polygonum lapathifolia. Reddish-brown achenes with a shrunken area in the center of each side.  Polygonum lapathifolia. Reddish-brown achenes with a shrunken area in the center of each side. 
Persicaria lapathifolia
Polygonum lapathifolia. Reddish-brown achenes with a shrunken area in the center of each side. 
Petroselinum crispum. Mericarps with well-developed stylopodia. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Petroselinum crispum. Mericarps with well-developed stylopodia. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Petroselinum crispum
Petroselinum crispum. Mericarps with well-developed stylopodia. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Petunia sp. True seeds with ridges of reticulations that are stippled.  Petunia sp. True seeds with ridges of reticulations that are stippled. 
Petunia sp.
Petunia sp. True seeds with ridges of reticulations that are stippled. 
Phacelia campanularia. True seeds with the appearance of a small honeycomb. Phacelia campanularia. True seeds with the appearance of a small honeycomb.
Phacelia campanularia
Phacelia campanularia. True seeds with the appearance of a small honeycomb.

Phalaris aquatica . Shiny florets. Phalaris aquatica. Shiny florets.
Phalaris aquatica
Phalaris aquatica. Shiny florets.
Phalaris aquatica. Florets with lemmas and paleas that have a few strong and longitudinal lines.  Phalaris aquatica. Florets with lemmas and paleas that have a few strong and longitudinal lines. 
Phalaris aquatica
Phalaris aquatica. Florets with lemmas and paleas that have a few strong and longitudinal lines. 
Phalaris arundinacea. Florets where aside from the pubescence, the surface is shiny and smooth.  Phalaris arundinacea. Florets where aside from the pubescence, the surface is shiny and smooth. 
Phalaris arundinacea
Phalaris arundinacea. Florets where aside from the pubescence, the surface is shiny and smooth. 
From Left to Right: 1. Phalaris arundinacea 2. Phalaris canariensis. Two short sterile lemmas on either edge of the floret.  From Left to Right: 1. Phalaris arundinacea 2. Phalaris canariensis. Two short sterile lemmas on either edge of the floret. 
Phalaris arundinacea
From Left to Right: 1. Phalaris arundinacea 2. Phalaris canariensis. Two short sterile lemmas on either edge of the floret.