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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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Medicago murex. Seeds with a sharp hilum indentation at the radicle lobe end. Medicago murex. Seeds with a sharp hilum indentation at the radicle lobe end.
Medicago murex
Medicago murex. Seeds with a sharp hilum indentation at the radicle lobe end.
Medicago orbicularis. Seeds with a deep groove between the radicle and the cotyledon lobes, with the hilum at the tips of the radicle. Medicago orbicularis. Seeds with a deep groove between the radicle and the cotyledon lobes, with the hilum at the tips of the radicle.
Medicago orbicularis
Medicago orbicularis. Seeds with a deep groove between the radicle and the cotyledon lobes, with the hilum at the tips of the radicle.
Medicago polyceratia. Yellow seeds with black tubercles. Medicago polyceratia. Yellow seeds with black tubercles.
Medicago polyceratia
Medicago polyceratia. Yellow seeds with black tubercles.
Medicago polymorpha. Seeds with a shallow notch as the hilum. Medicago polymorpha. Seeds with a shallow notch as the hilum.
Medicago polymorpha
Medicago polymorpha. Seeds with a shallow notch as the hilum.

Medicago rigidula. Seeds with a weak line between the radicle and cotyledon lobes. Medicago rigidula. Seeds with a weak line between the radicle and cotyledon lobes.
Medicago rigidula
Medicago rigidula. Seeds with a weak line between the radicle and cotyledon lobes.
Medicago sativa. Seeds that are yellowish to tan to brown (immature seeds may be yellowish- green). Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Medicago sativa. Seeds that are yellowish to tan to brown (immature seeds may be yellowish- green). Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Medicago sativa
Medicago sativa. Seeds that are yellowish to tan to brown (immature seeds may be yellowish- green). Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Medicago tenoreana. Seeds with the hilum in the middle of the concave margin. Medicago tenoreana. Seeds with the hilum in the middle of the concave margin.
Medicago tenoreana
Medicago tenoreana. Seeds with the hilum in the middle of the concave margin.
Megathyrsus maximus. Yellow florets with dark brown tips. Megathyrsus maximus. Yellow florets with dark brown tips.
Megathyrsus maximus
Megathyrsus maximus. Yellow florets with dark brown tips.

Melaleuca ericifolia. Seeds with a white hilum that is slightly diagonal to the base. Photo by Julia Scher, USDA-APHIS-PPQ. Melaleuca ericifolia. Seeds with a white hilum that is slightly diagonal to the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Melaleuca ericifolia
Melaleuca ericifolia. Seeds with a white hilum that is slightly diagonal to the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Melaleuca hypericifolia. Seeds with a brown hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ. Melaleuca hypericifolia. Seeds with a brown hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Melaleuca hypericifolia
Melaleuca hypericifolia. Seeds with a brown hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Melaleuca quinquenervia. Brown to white seeds. Photo by Julia Scher, USDA-APHIS-PPQ. Melaleuca quinquenervia. Brown to white seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Melaleuca quinquenervia
Melaleuca quinquenervia. Brown to white seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Melaleuca quinquenervia. Seeds with a white or brown hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ. Melaleuca quinquenervia. Seeds with a white or brown hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Melaleuca quinquenervia
Melaleuca quinquenervia. Seeds with a white or brown hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.

Melampodium leucanthum. Achenes with large longitudinal ribs with roughness in between them. Melampodium leucanthum. Achenes with large longitudinal ribs with roughness in between them.
Melampodium leucanthum
Melampodium leucanthum. Achenes with large longitudinal ribs with roughness in between them.
Melastoma malabathricum.  Immature and aborted seeds are dark brown to black in color. Photo by Julia Scher, USDA-APHIS-PPQ. Melastoma malabathricum. Immature and aborted seeds are dark brown to black in color. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum
Melastoma malabathricum. Immature and aborted seeds are dark brown to black in color. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum. Hilum is wide and round and is lateral to the base of the seed. Photo by Julia Scher, USDA-APHIS-PPQ. Melastoma malabathricum. Hilum is wide and round and is lateral to the base of the seed. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum
Melastoma malabathricum. Hilum is wide and round and is lateral to the base of the seed. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum.  The seed embryo lies in a partial coil with the wide end terminating in the back of the hilum. Photo by Julia Scher, USDA-APHIS-PPQ. Melastoma malabathricum. The seed embryo lies in a partial coil with the wide end terminating in the back of the hilum. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum
Melastoma malabathricum. The seed embryo lies in a partial coil with the wide end terminating in the back of the hilum. Photo by Julia Scher, USDA-APHIS-PPQ.

Melastoma malabathricum . Seeds are covered with concentric rows of tubercles. Photo by Julia Scher, USDA-APHIS-PPQ. Melastoma malabathricum. Seeds are covered with concentric rows of tubercles. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum
Melastoma malabathricum. Seeds are covered with concentric rows of tubercles. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum.  The seed embryo lies in a partial coil with the wide end terminating in the back of the hilum. Photo by Julia Scher, USDA-APHIS-PPQ. Melastoma malabathricum. The seed embryo lies in a partial coil with the wide end terminating in the back of the hilum. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum
Melastoma malabathricum. The seed embryo lies in a partial coil with the wide end terminating in the back of the hilum. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum. Light brown to black seeds. Melastoma malabathricum. Light brown to black seeds.
Melastoma malabathricum
Melastoma malabathricum. Light brown to black seeds.
Melastoma malabathricum. Seed capsules. Photo by Julia Scher, USDA-APHIS-PPQ. Melastoma malabathricum. Seed capsules. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum
Melastoma malabathricum. Seed capsules. Photo by Julia Scher, USDA-APHIS-PPQ.

Melastoma malabathricum.  Young seed in capsule. Photo by Julia Scher, USDA-APHIS-PPQ. Melastoma malabathricum. Young seed in capsule. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma malabathricum
Melastoma malabathricum. Young seed in capsule. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma sanguineum. Reticulated seeds. Photo by Julia Scher, USDA-APHIS-PPQ. Melastoma sanguineum. Reticulated seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma sanguineum
Melastoma sanguineum. Reticulated seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma sanguineum. The hilum is the full width of the seed. Photo by Julia Scher, USDA-APHIS-PPQ. Melastoma sanguineum. The hilum is the full width of the seed. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma sanguineum
Melastoma sanguineum. The hilum is the full width of the seed. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma sanguineum. The hilum is the full width of the seed. Photo by Julia Scher, USDA-APHIS-PPQ. Melastoma sanguineum. The hilum is the full width of the seed. Photo by Julia Scher, USDA-APHIS-PPQ.
Melastoma sanguineum
Melastoma sanguineum. The hilum is the full width of the seed. Photo by Julia Scher, USDA-APHIS-PPQ.

Melica californica. Lemma has seven longitudinal ribs. Melica californica. Lemma has seven longitudinal ribs.
Melica californica
Melica californica. Lemma has seven longitudinal ribs.
Melica californica. Florets with a brown caryopsis. Melica californica. Florets with a brown caryopsis.
Melica californica
Melica californica. Florets with a brown caryopsis.
Melica imperfecta. Florets often have a sterile floret attached to the rachilla.  Melica imperfecta. Florets often have a sterile floret attached to the rachilla. 
Melica imperfecta
Melica imperfecta. Florets often have a sterile floret attached to the rachilla. 
Melica imperfecta. Brown awnless florets.  Melica imperfecta. Brown awnless florets. 
Melica imperfecta
Melica imperfecta. Brown awnless florets. 

Melilotus albus. Seeds are yellow to tan to greenish-tan with no mottling. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Melilotus albus. Seeds are yellow to tan to greenish-tan with no mottling. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Melilotus albus
Melilotus albus. Seeds are yellow to tan to greenish-tan with no mottling. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Melilotus indicus. Seeds with a rough seed coat and a dark color. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Melilotus indicus. Seeds with a rough seed coat and a dark color. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Melilotus indicus
Melilotus indicus. Seeds with a rough seed coat and a dark color. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Melilotus officinalis. Seeds that are yellow to tan to greenish-tan, with some seeds mottled with red and purple. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences. Melilotus officinalis. Seeds that are yellow to tan to greenish-tan, with some seeds mottled with red and purple. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Melilotus officinalis
Melilotus officinalis. Seeds that are yellow to tan to greenish-tan, with some seeds mottled with red and purple. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Melissa officinalis. Nutlets with a white basal end and a transversely rounded side. Melissa officinalis. Nutlets with a white basal end and a transversely rounded side.
Melissa officinalis
Melissa officinalis. Nutlets with a white basal end and a transversely rounded side.

Comparison of Asperugo procumbens and Melissa officinalis.  Photo by Michael K. Kirkpatrick, USDA-APHIS-PPQ. Comparison of Asperugo procumbens and Melissa officinalis. Photo by Michael K. Kirkpatrick, USDA-APHIS-PPQ.
Melissa officinalis
Comparison of Asperugo procumbens and Melissa officinalis. Photo by Michael K. Kirkpatrick, USDA-APHIS-PPQ.
Mentha X piperita. Nutlets with proportionately large joining scars at the base.  Mentha X piperita. Nutlets with proportionately large joining scars at the base. 
Mentha × piperita
Mentha X piperita. Nutlets with proportionately large joining scars at the base. 
From Left to Right: 1. Salvia azurea var . grandiflora 2. Dracocephalum parviflora 3. Salvia reflexa 4. Nepeta cataria 5. Monarda punctata 6. Mentha arvensis. Nutlets with two points of attachment to the flower base. From Left to Right: 1. Salvia azurea var. grandiflora 2. Dracocephalum parviflora 3. Salvia reflexa 4. Nepeta cataria 5. Monarda punctata 6. Mentha arvensis. Nutlets with two points of attachment to the flower base.
Mentha arvensis
From Left to Right: 1. Salvia azurea var. grandiflora 2. Dracocephalum parviflora 3. Salvia reflexa 4. Nepeta cataria 5. Monarda punctata 6. Mentha arvensis. Nutlets with two points of attachment to the flower base.
Mentha pulegium. Granular nutlets with two flat surfaces on the ventral side, with a rib.  Mentha pulegium. Granular nutlets with two flat surfaces on the ventral side, with a rib. 
Mentha pulegium
Mentha pulegium. Granular nutlets with two flat surfaces on the ventral side, with a rib. 

Mentha spicata . Stippled nutlets with a basal attachment with two lateral indentations. Mentha spicata. Stippled nutlets with a basal attachment with two lateral indentations.
Mentha spicata
Mentha spicata. Stippled nutlets with a basal attachment with two lateral indentations.
Mentzelia lindleyi. Seeds that are uniformly covered with regular tubercles. Mentzelia lindleyi. Seeds that are uniformly covered with regular tubercles.
Mentzelia lindleyi
Mentzelia lindleyi. Seeds that are uniformly covered with regular tubercles.
Miconia calvescens.  Utricles with a collar at the apical end. Miconia calvescens. Utricles with a collar at the apical end.
Miconia calvescens
Miconia calvescens. Utricles with a collar at the apical end.
Mikania cordata. Achenes with a pappus of many white and rough hairs. Photo by Julia Scher, USDA-APHIS-PPQ. Mikania cordata. Achenes with a pappus of many white and rough hairs. Photo by Julia Scher, USDA-APHIS-PPQ.
Mikania cordata
Mikania cordata. Achenes with a pappus of many white and rough hairs. Photo by Julia Scher, USDA-APHIS-PPQ.