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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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Rapistrum rugosum. Light brown seed in a silicle. Rapistrum rugosum. Light brown seed in a silicle.
Rapistrum rugosum
Rapistrum rugosum. Light brown seed in a silicle.
Ratibida columnifera. Achenes with a pappus crown that extends the full width of the achene. Ratibida columnifera. Achenes with a pappus crown that extends the full width of the achene.
Ratibida columnifera
Ratibida columnifera. Achenes with a pappus crown that extends the full width of the achene.
Ratibida pinnata. Achenes that are laterally compressed, producing a sharp margin on either side. Ratibida pinnata. Achenes that are laterally compressed, producing a sharp margin on either side.
Ratibida pinnata
Ratibida pinnata. Achenes that are laterally compressed, producing a sharp margin on either side.
Reseda odorata. True seeds with rugose ridges that are generally oriented transversely toward the hilum. Reseda odorata. True seeds with rugose ridges that are generally oriented transversely toward the hilum.
Reseda odorata
Reseda odorata. True seeds with rugose ridges that are generally oriented transversely toward the hilum.

Rhamnus crocea. True seeds that are borne singly in a fruit coat.  Rhamnus crocea. True seeds that are borne singly in a fruit coat. 
Rhamnus crocea
Rhamnus crocea. True seeds that are borne singly in a fruit coat. 
Rhaponticum repens. Achenes with the margin continually curved at both ends of the achene, with no angular shoulder at the stylar end.Photo by Julia Scher, USDA-APHIS-PPQ. Rhaponticum repens. Achenes with the margin continually curved at both ends of the achene, with no angular shoulder at the stylar end.Photo by Julia Scher, USDA-APHIS-PPQ.
Rhaponticum repens
Rhaponticum repens. Achenes with the margin continually curved at both ends of the achene, with no angular shoulder at the stylar end.Photo by Julia Scher, USDA-APHIS-PPQ.
Rhaponticum repens. Stylar lobe.Photo by Julia Scher, USDA-APHIS-PPQ. Rhaponticum repens. Stylar lobe.Photo by Julia Scher, USDA-APHIS-PPQ.
Rhaponticum repens
Rhaponticum repens. Stylar lobe.Photo by Julia Scher, USDA-APHIS-PPQ.
Rhaponticum repens. Smooth achenes.Photo by Julia Scher, USDA-APHIS-PPQ. Rhaponticum repens. Smooth achenes.Photo by Julia Scher, USDA-APHIS-PPQ.
Rhaponticum repens
Rhaponticum repens. Smooth achenes.Photo by Julia Scher, USDA-APHIS-PPQ.

Rhaponticum repens. Achenes that are obovate and semi-compressed longitudinally. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Rhaponticum repens. Achenes that are obovate and semi-compressed longitudinally. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Rhaponticum repens
Rhaponticum repens. Achenes that are obovate and semi-compressed longitudinally. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
From Left to Right: 1. Grindelia squarrosa 2.  Rhaponticum repens. Grendalia squarrosa on the left has more distinct longitudinal ridges and squared shoulders at the stylar end.  Rhaponticum repens  is smoother and rounded shoulders. From Left to Right: 1. Grindelia squarrosa 2. Rhaponticum repens. Grendalia squarrosa on the left has more distinct longitudinal ridges and squared shoulders at the stylar end. Rhaponticum repens is smoother and rounded shoulders.
Rhaponticum repens
From Left to Right: 1. Grindelia squarrosa 2. Rhaponticum repens. Grendalia squarrosa on the left has more distinct longitudinal ridges and squared shoulders at the stylar end. Rhaponticum repens is smoother and rounded shoulders.
Rheum rhabarbarum. Achenes are usually found covered with winged floral structures that adhere closely to the achene body.  Rheum rhabarbarum. Achenes are usually found covered with winged floral structures that adhere closely to the achene body. 
Rheum rhabarbarum
Rheum rhabarbarum. Achenes are usually found covered with winged floral structures that adhere closely to the achene body. 
Rhodochiton atrosanguineus. True seeds with a translucent, ray-like margin fringe.  Rhodochiton atrosanguineus. True seeds with a translucent, ray-like margin fringe. 
Rhodochiton atrosanguineus
Rhodochiton atrosanguineus. True seeds with a translucent, ray-like margin fringe. 

Rhodomyrtus tomentosa. True seeds with slightly rough lateral sides with some radial ridges. Rhodomyrtus tomentosa. True seeds with slightly rough lateral sides with some radial ridges.
Rhodomyrtus tomentosa
Rhodomyrtus tomentosa. True seeds with slightly rough lateral sides with some radial ridges.
Rhus glabra.  True seeds that are borne in single-seeded fruit pods. Rhus glabra. True seeds that are borne in single-seeded fruit pods.
Rhus glabra
Rhus glabra. True seeds that are borne in single-seeded fruit pods.
Rhus aromatica var. aromatica. True seeds that are often not free of fruit tissue.  Rhus aromatica var. aromatica. True seeds that are often not free of fruit tissue. 
Rhus trilobata var. trilobata
Rhus aromatica var. aromatica. True seeds that are often not free of fruit tissue. 
Rhynchospora sp. Achenes with a long, wide beak originating from the apex. Rhynchospora sp. Achenes with a long, wide beak originating from the apex.
Rhynchospora sp.
Rhynchospora sp. Achenes with a long, wide beak originating from the apex.

Richardia scabra. Mericarps that have seed coats (testas) with strigose hairs.  Richardia scabra. Mericarps that have seed coats (testas) with strigose hairs. 
Richardia scabra
Richardia scabra. Mericarps that have seed coats (testas) with strigose hairs. 
Richardia scabra. Mericarps with a scar that is a longitudinal indentation.  Richardia scabra. Mericarps with a scar that is a longitudinal indentation. 
Richardia scabra
Richardia scabra. Mericarps with a scar that is a longitudinal indentation. 
Ricinus communis. Mottled seeds with a well-developed caruncle.  Ricinus communis. Mottled seeds with a well-developed caruncle. 
Ricinus communis
Ricinus communis. Mottled seeds with a well-developed caruncle. 
Robinia hispida var . fertilis.  True seeds with a white hilum and chalaza. Robinia hispida var. fertilis. True seeds with a white hilum and chalaza.
Robinia hispida var. fertilis
Robinia hispida var. fertilis. True seeds with a white hilum and chalaza.

Rorippa austriaca. True seeds with square reticulations on the seed surface.  Rorippa austriaca. True seeds with square reticulations on the seed surface. 
Rorippa austriaca
Rorippa austriaca. True seeds with square reticulations on the seed surface. 
Rosa multiflora. Achenes with a cap on the apex. Rosa multiflora. Achenes with a cap on the apex.
Rosa multiflora
Rosa multiflora. Achenes with a cap on the apex.
Rosa multiflora. Achenes with a cap on the apex. Rosa multiflora. Achenes with a cap on the apex.
Rosa multiflora
Rosa multiflora. Achenes with a cap on the apex.
Rosa woodsii . Achenes with a visible longitudinal suture and flat facets. Rosa woodsii. Achenes with a visible longitudinal suture and flat facets.
Rosa woodsii
Rosa woodsii. Achenes with a visible longitudinal suture and flat facets.

Rosa woodsii . Achenes with scattered tubercles. Rosa woodsii. Achenes with scattered tubercles.
Rosa woodsii
Rosa woodsii. Achenes with scattered tubercles.
Rosmarinus officinalis. Nutlets with a Large, circular, and white nutlet attachment at the base.  Rosmarinus officinalis. Nutlets with a Large, circular, and white nutlet attachment at the base. 
Rosmarinus officinalis
Rosmarinus officinalis. Nutlets with a Large, circular, and white nutlet attachment at the base. 
Rosmarinus officinalis. Nutlets with a Large, circular, and white nutlet attachment at the base.  Rosmarinus officinalis. Nutlets with a Large, circular, and white nutlet attachment at the base. 
Rosmarinus officinalis
Rosmarinus officinalis. Nutlets with a Large, circular, and white nutlet attachment at the base. 
Rottboellia cochinchinensis. Rachis segments with a knob on the base. Photo by Julia Scher, USDA-APHIS-PPQ. Rottboellia cochinchinensis. Rachis segments with a knob on the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia cochinchinensis
Rottboellia cochinchinensis. Rachis segments with a knob on the base. Photo by Julia Scher, USDA-APHIS-PPQ.

Rottboellia cochinchinensis. Rachis segments with a knob on the base. Photo by Julia Scher, USDA-APHIS-PPQ. Rottboellia cochinchinensis. Rachis segments with a knob on the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia cochinchinensis
Rottboellia cochinchinensis. Rachis segments with a knob on the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia cochinchinensis. Rachis segments with a connective knob between in segments.Photo by Julia Scher, USDA-APHIS-PPQ. Rottboellia cochinchinensis. Rachis segments with a connective knob between in segments.Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia cochinchinensis
Rottboellia cochinchinensis. Rachis segments with a connective knob between in segments.Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia cochinchinensis. Rachis segments with a floret embedded in the unit. Photo by Julia Scher, USDA-APHIS-PPQ. Rottboellia cochinchinensis. Rachis segments with a floret embedded in the unit. Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia cochinchinensis
Rottboellia cochinchinensis. Rachis segments with a floret embedded in the unit. Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia cochinchinensis. Rachis segments. Photo by Julia Scher, USDA-APHIS-PPQ. Rottboellia cochinchinensis. Rachis segments. Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia cochinchinensis
Rottboellia cochinchinensis. Rachis segments. Photo by Julia Scher, USDA-APHIS-PPQ.

Rottboellia cochinchinensis. Rachis segments that disarticulate between each spikelet. Photo by Julia Scher, USDA-APHIS-PPQ. Rottboellia cochinchinensis. Rachis segments that disarticulate between each spikelet. Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia cochinchinensis
Rottboellia cochinchinensis. Rachis segments that disarticulate between each spikelet. Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia cochinchinensis. Rachis segments that form a cylinder with a knob on the base.  Rottboellia cochinchinensis. Rachis segments that form a cylinder with a knob on the base. 
Rottboellia cochinchinensis
Rottboellia cochinchinensis. Rachis segments that form a cylinder with a knob on the base. 
Mnesithea selloana.  Rachis segments. Photo by Julia Scher, USDA-APHIS-PPQ. Mnesithea selloana. Rachis segments. Photo by Julia Scher, USDA-APHIS-PPQ.
Rottboellia selloana
Mnesithea selloana. Rachis segments. Photo by Julia Scher, USDA-APHIS-PPQ.
Rubus allegheniensis. True seeds that are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ. Rubus allegheniensis. True seeds that are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ.
Rubus allegheniensis
Rubus allegheniensis. True seeds that are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ.

Rubus allegheniensis. True seeds that are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ. Rubus allegheniensis. True seeds that are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ.
Rubus allegheniensis
Rubus allegheniensis. True seeds that are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ.
Rubus argutus. True seeds with some coloration from the fruit stain and reticulations that are equilateral at the apical end but more longitudinal near the base.  Rubus argutus. True seeds with some coloration from the fruit stain and reticulations that are equilateral at the apical end but more longitudinal near the base. 
Rubus argutus
Rubus argutus. True seeds with some coloration from the fruit stain and reticulations that are equilateral at the apical end but more longitudinal near the base. 
Rubus armeniacus. True seed with fruit material. Photo by Julia Scher, USDA-APHIS-PPQ. Rubus armeniacus. True seed with fruit material. Photo by Julia Scher, USDA-APHIS-PPQ.
Rubus armeniacus
Rubus armeniacus. True seed with fruit material. Photo by Julia Scher, USDA-APHIS-PPQ.
Rubus chloocladus. True seeds that are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ. Rubus chloocladus. True seeds that are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ.
Rubus chloocladus
Rubus chloocladus. True seeds that are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ.