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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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Bottom row: Leucanthemum vulgare.  Top row:  Leucanthemum × superbum. Achenes with strong longitudinal ribs. Bottom row: Leucanthemum vulgare.  Top row:  Leucanthemum × superbum. Achenes with strong longitudinal ribs.
Leucanthemum × superbum
Bottom row: Leucanthemum vulgare.  Top row:  Leucanthemum × superbum. Achenes with strong longitudinal ribs.
Bottom row:  Leucanthemum vulgare .Top row: .  Achenes with a prominent stylar knob. Bottom row: Leucanthemum vulgare.Top row: .  Achenes with a prominent stylar knob.
Leucanthemum vulgare
Bottom row: Leucanthemum vulgare.Top row: .  Achenes with a prominent stylar knob.
Leucanthemum vulgare. Achenes with yellow ribs and black interspaces. Leucanthemum vulgare. Achenes with yellow ribs and black interspaces.
Leucanthemum vulgare
Leucanthemum vulgare. Achenes with yellow ribs and black interspaces.
Levisticum officinale. Mericarps with a large stigma structure on the basal end. Levisticum officinale. Mericarps with a large stigma structure on the basal end.
Levisticum officinale
Levisticum officinale. Mericarps with a large stigma structure on the basal end.

Leymus angustus. Florets with hairs on the upper margin of the callus.  Leymus angustus. Florets with hairs on the upper margin of the callus. 
Leymus angustus
Leymus angustus. Florets with hairs on the upper margin of the callus. 
Leymus cinereus. Florets with a sparsely hispid lemma that is villous along the sides and the base. Leymus cinereus. Florets with a sparsely hispid lemma that is villous along the sides and the base.
Leymus cinereus
Leymus cinereus. Florets with a sparsely hispid lemma that is villous along the sides and the base.
Leymus karelinii.  Florets with a V-shaped rachilla and appressed hairs. Leymus karelinii. Florets with a V-shaped rachilla and appressed hairs.
Leymus karelinii
Leymus karelinii. Florets with a V-shaped rachilla and appressed hairs.
Leymus racemosus. Florets with a V-shaped rachilla sinuses that are covered with long hair. Leymus racemosus. Florets with a V-shaped rachilla sinuses that are covered with long hair.
Leymus racemosus
Leymus racemosus. Florets with a V-shaped rachilla sinuses that are covered with long hair.

Leymus racemosus ssp. racemosus. The rachilla is wide at the apex and narrow at the base, with a groove over the callus.  Leymus racemosus ssp. racemosus. The rachilla is wide at the apex and narrow at the base, with a groove over the callus. 
Leymus racemosus subsp. racemosus
Leymus racemosus ssp. racemosus. The rachilla is wide at the apex and narrow at the base, with a groove over the callus. 
Leymus racemosus ssp. racemosus. The caryopsis is very hairy on the rachilla and on the lateral sides of the lemma on the basal half. Leymus racemosus ssp. racemosus. The caryopsis is very hairy on the rachilla and on the lateral sides of the lemma on the basal half.
Leymus racemosus subsp. racemosus
Leymus racemosus ssp. racemosus. The caryopsis is very hairy on the rachilla and on the lateral sides of the lemma on the basal half.
Liatris punctata. Achenes with a pointed basal end. Liatris punctata. Achenes with a pointed basal end.
Liatris punctata
Liatris punctata. Achenes with a pointed basal end.
Liatris pycnostachy. Achenes with thin longitudinal ribs with short hairs. Liatris pycnostachy. Achenes with thin longitudinal ribs with short hairs.
Liatris pycnostachy
Liatris pycnostachy. Achenes with thin longitudinal ribs with short hairs.

Liatris spicata. Achenes with an extensive featherlike pappus. Liatris spicata. Achenes with an extensive featherlike pappus.
Liatris spicata
Liatris spicata. Achenes with an extensive featherlike pappus.
Limnophila sessiliflora. Seeds with a hilum that is circular and square with the base. Photo by Julia Scher, USDA-APHIS-PPQ. Limnophila sessiliflora. Seeds with a hilum that is circular and square with the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Limnophila sessiliflora
Limnophila sessiliflora. Seeds with a hilum that is circular and square with the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Limnophila sessiliflora. Seed surface texture is shiny, even if highly reticulated. Photo by Julia Scher, USDA-APHIS-PPQ. Limnophila sessiliflora. Seed surface texture is shiny, even if highly reticulated. Photo by Julia Scher, USDA-APHIS-PPQ.
Limnophila sessiliflora
Limnophila sessiliflora. Seed surface texture is shiny, even if highly reticulated. Photo by Julia Scher, USDA-APHIS-PPQ.
Limnophila sessiliflora. Seeds in capsules. Photo by Julia Scher, USDA-APHIS-PPQ. Limnophila sessiliflora. Seeds in capsules. Photo by Julia Scher, USDA-APHIS-PPQ.
Limnophila sessiliflora
Limnophila sessiliflora. Seeds in capsules. Photo by Julia Scher, USDA-APHIS-PPQ.

Limonium sinuatum. Light brown in the center of the seeds. Limonium sinuatum. Light brown in the center of the seeds.
Limonium sinuatum
Limonium sinuatum. Light brown in the center of the seeds.
Linaria dalmatica. Seeds with strong meandering ridges and a light brown, translucent wing on the margin.  Linaria dalmatica. Seeds with strong meandering ridges and a light brown, translucent wing on the margin. 
Linaria dalmatica
Linaria dalmatica. Seeds with strong meandering ridges and a light brown, translucent wing on the margin. 
Linaria maroccana.  Irregularly shaped seeds with large transverse ridges covered with small tubercles.  Linaria maroccana. Irregularly shaped seeds with large transverse ridges covered with small tubercles. 
Linaria maroccana
Linaria maroccana. Irregularly shaped seeds with large transverse ridges covered with small tubercles. 
Linaria maroccana. Seeds with large transverse ridges covered with small tubercles.  Linaria maroccana. Seeds with large transverse ridges covered with small tubercles. 
Linaria maroccana
Linaria maroccana. Seeds with large transverse ridges covered with small tubercles. 

Linaria vulgaris . Discoid seed surrounded by a wing. Linaria vulgaris. Discoid seed surrounded by a wing.
Linaria vulgaris
Linaria vulgaris. Discoid seed surrounded by a wing.
Linum grandiflorum. Seeds with a thin margin. Linum grandiflorum. Seeds with a thin margin.
Linum grandiflorum
Linum grandiflorum. Seeds with a thin margin.
Linum lewisii. Wrinkled seeds with fine stipples. Linum lewisii. Wrinkled seeds with fine stipples.
Linum lewisii
Linum lewisii. Wrinkled seeds with fine stipples.
Linum perenne. Wrinkled seeds with a sharp margin and small tubercles. Linum perenne. Wrinkled seeds with a sharp margin and small tubercles.
Linum perenne
Linum perenne. Wrinkled seeds with a sharp margin and small tubercles.

Linum usitatissimum . Hilum at indentation just lateral to the seed base. Linum usitatissimum. Hilum at indentation just lateral to the seed base.
Linum usitatissimum
Linum usitatissimum. Hilum at indentation just lateral to the seed base.
Lithospermum ruderale. Shiny and porcelain-like nutlets with an apex with a crown. Lithospermum ruderale. Shiny and porcelain-like nutlets with an apex with a crown.
Lithospermum ruderale
Lithospermum ruderale. Shiny and porcelain-like nutlets with an apex with a crown.
Lobelia erinus. Shiny and striate seeds that can form clumps. Lobelia erinus. Shiny and striate seeds that can form clumps.
Lobelia erinus
Lobelia erinus. Shiny and striate seeds that can form clumps.
Lobelia sp. Shiny and striate seeds in various shades of brown. Lobelia sp. Shiny and striate seeds in various shades of brown.
Lobelia sp.
Lobelia sp. Shiny and striate seeds in various shades of brown.

Lobularia maritima. Seeds with a narrow and transparent wing for a margin. Lobularia maritima. Seeds with a narrow and transparent wing for a margin.
Lobularia maritima
Lobularia maritima. Seeds with a narrow and transparent wing for a margin.
From Left to Right: 1.   Lolium perenne  ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum . Caryopses with a straight and wide callus.  From Left to Right: 1.  Lolium perenne ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum. Caryopses with a straight and wide callus. 
Lolium perenne
From Left to Right: 1.  Lolium perenne ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum. Caryopses with a straight and wide callus. 
Lolium perenne. Florets with no awns and shiny palea and lemma surfaces. Lolium perenne. Florets with no awns and shiny palea and lemma surfaces.
Lolium perenne
Lolium perenne. Florets with no awns and shiny palea and lemma surfaces.
From Left to Right: 1. Lolium perenne ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum . Caryopses with a flat rachilla. From Left to Right: 1. Lolium perenne ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum. Caryopses with a flat rachilla.
Lolium perenne subsp. multiflorum
From Left to Right: 1. Lolium perenne ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum. Caryopses with a flat rachilla.

Lolium perenne ssp. multiflorum. Florets with no awns and shiny palea and lemma surfaces. Lolium perenne ssp. multiflorum. Florets with no awns and shiny palea and lemma surfaces.
Lolium perenne subsp. multiflorum
Lolium perenne ssp. multiflorum. Florets with no awns and shiny palea and lemma surfaces.
From Left to Right: 1. Lolium perenne  ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum. Florets with a slender and brittle awn.  From Left to Right: 1. Lolium perenne ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum. Florets with a slender and brittle awn. 
Lolium persicum
From Left to Right: 1. Lolium perenne ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum. Florets with a slender and brittle awn. 
Lolium persicum. Long florets. Lolium persicum. Long florets.
Lolium persicum
Lolium persicum. Long florets.
From Left to Right: 1.   Lolium perenne  ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum.  Florets that are the widest in the middle. From Left to Right: 1.  Lolium perenne ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum. Florets that are the widest in the middle.
Lolium temulentum
From Left to Right: 1.  Lolium perenne ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum. Florets that are the widest in the middle.

Lolium temulentum. Florets with a wide callus. Lolium temulentum. Florets with a wide callus.
Lolium temulentum
Lolium temulentum. Florets with a wide callus.
Lotus corniculatus.  Olive brown seeds that are often flecked with dark or light colors. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Lotus corniculatus. Olive brown seeds that are often flecked with dark or light colors. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lotus corniculatus
Lotus corniculatus. Olive brown seeds that are often flecked with dark or light colors. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lotus pedunculatus. Seeds with no white collar around the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Lotus pedunculatus. Seeds with no white collar around the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lotus pedunculatus
Lotus pedunculatus. Seeds with no white collar around the hilum. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Lunaria annua . Seeds with a few lines radiating from the hilum. Lunaria annua. Seeds with a few lines radiating from the hilum.
Lunaria annua
Lunaria annua. Seeds with a few lines radiating from the hilum.