Gallery

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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Poa napensis. Florets with lemma nerves that are not hairy.

Poa napensis
Poa napensis. Florets with lemma nerves that are not hairy.

From Left to Right: 1. Poa annua 2. Poa compressa 3. Poa nemoralis 4. Poa pratensis 5. Poa trivialis. Florets with stiff and bristly rachilla hairs.

Poa nemoralis
From Left to Right: 1. Poa annua 2. Poa compressa 3. Poa nemoralis 4. Poa pratensis 5. Poa trivialis. Florets with stiff and bristly rachilla hairs.

Poa nemoralis. Florets with midnerves on the lemma that are absent or only on the basal half.

Poa nemoralis
Poa nemoralis. Florets with midnerves on the lemma that are absent or only on the basal half.

Poa palustris. Florets that are bronze at the apex.

Poa palustris
Poa palustris. Florets that are bronze at the apex.

Poa palustris. Florets with webbing and hair on nerves are often removed by processing.

Poa palustris
Poa palustris. Florets with webbing and hair on nerves are often removed by processing.

From Left to Right: 1. Poa annua 2. Poa compressa 3. Poa nemoralis 4. Poa pratensis 5. Poa trivialis. Florets with coarse and wide-spaced teeth on the palea margins.

Poa pratensis
From Left to Right: 1. Poa annua 2. Poa compressa 3. Poa nemoralis 4. Poa pratensis 5. Poa trivialis. Florets with coarse and wide-spaced teeth on the palea margins.

Poa pratensis. Florets with strong intermediate nerves and a dark brown base on the lemma.

Poa pratensis
Poa pratensis. Florets with strong intermediate nerves and a dark brown base on the lemma.

Poa secunda. Florets with no apparent webbing on the lemma or the base.

Poa secunda
Poa secunda. Florets with no apparent webbing on the lemma or the base.

Poa supina. Florets with a woolly central lemma and marginal nerves , and a lemma apex that is sometimes transparent.

Poa supina
Poa supina. Florets with a woolly central lemma and marginal nerves , and a lemma apex that is sometimes transparent.

From Left to Right: 1. Poa annua 2. Poa compressa 3. Poa nemoralis 4. Poa pratensis 5. Poa trivialis. Florets with pubescence on the lower half of the lemma nerves.

Poa trivialis
From Left to Right: 1. Poa annua 2. Poa compressa 3. Poa nemoralis 4. Poa pratensis 5. Poa trivialis. Florets with pubescence on the lower half of the lemma nerves.

Poa trivialis. Florets with short pubescence on the lower half of the lemma nerves.

Poa trivialis
Poa trivialis. Florets with short pubescence on the lower half of the lemma nerves.

Poa trivialis. Florets with a dorsal side that tends to be strongly arched, while the ventral side is straight.

Poa trivialis
Poa trivialis. Florets with a dorsal side that tends to be strongly arched, while the ventral side is straight.

Polygonum argyrocoleon. Achenes with a pointed apex.

Polygonum argyrocoleon
Polygonum argyrocoleon. Achenes with a pointed apex.

Polygonum argyrocoleon. Achenes with two sides that are slightly smaller than the third.

Polygonum argyrocoleon
Polygonum argyrocoleon. Achenes with two sides that are slightly smaller than the third.

Polygonum aviculare. Reddish-brown achenes with rough sides and smooth edges. Remnants or entire floral parts present.

Polygonum aviculare
Polygonum aviculare. Reddish-brown achenes with rough sides and smooth edges. Remnants or entire floral parts present.

Polygonum convolvulus var. convolvulus. Achenes with remnants of the floral parts are present.

Polygonum convolvulus var. convolvulus
Polygonum convolvulus var. convolvulus. Achenes with remnants of the floral parts are present.

Polygonum cuspidatum. Black achenes that are partly or wholly enclosed by sepals.

Polygonum cuspidatum
Polygonum cuspidatum. Black achenes that are partly or wholly enclosed by sepals.

Polygonum hydropiper. Achenes with remnants of speckled floral parts.

Polygonum hydropiper
Polygonum hydropiper. Achenes with remnants of speckled floral parts.

Polygonum orientale. Achenes with a small hump on the apex and a large hump on the base.

Polygonum orientale
Polygonum orientale. Achenes with a small hump on the apex and a large hump on the base.

Polygonum pensylvanica. Two-sided achenes that are slightly convex on each side.

Polygonum pensylvanicum
Polygonum pensylvanica. Two-sided achenes that are slightly convex on each side.

Polygonum perfoliata. Achenes with various amounts of floral structures are attached to their bases.

Polygonum perfoliatum
Polygonum perfoliata. Achenes with various amounts of floral structures are attached to their bases.

Polygonum persicaria. Smooth and shiny achenes with remnants of the floral structures attached to the base.

Polygonum persicaria
Polygonum persicaria. Smooth and shiny achenes with remnants of the floral structures attached to the base.

Polygonum punctatum var. punctatum. Achenes with a small point on the apex and a large hump on the base.

Polygonum punctatum var. punctatum
Polygonum punctatum var. punctatum. Achenes with a small point on the apex and a large hump on the base.

Polygonum ramosissimum. Achenes that may be covered with sepals that are not winged.

Polygonum ramosissimum
Polygonum ramosissimum. Achenes that may be covered with sepals that are not winged.

Polypogon monspeliensis. Florets with long, hairy, and awned glumes.

Polypogon monspeliensis
Polypogon monspeliensis. Florets with long, hairy, and awned glumes.

Portulaca oleracea. Silvery black true seeds with Tubercles arranged in rows parallel to the margin.

Portulaca oleracea
Portulaca oleracea. Silvery black true seeds with Tubercles arranged in rows parallel to the margin.

Potentilla argentea. Achenes with the hilum, often with a spur.

Potentilla argentea
Potentilla argentea. Achenes with the hilum, often with a spur.

Potentilla canadensis. True seeds with yellow ridges that tend to be arranged parallel to the straight part of the margin.

Potentilla canadensis
Potentilla canadensis. True seeds with yellow ridges that tend to be arranged parallel to the straight part of the margin.

Potentilla nepalensis. Achenes with the concave part of the margin filled with a hump.

Potentilla nepalensis
Potentilla nepalensis. Achenes with the concave part of the margin filled with a hump.

Potentilla norvegica. True seeds with rounded ridges that tend to be parallel to the straight portion of the margin.

Potentilla norvegica
Potentilla norvegica. True seeds with rounded ridges that tend to be parallel to the straight portion of the margin.

Potentilla recta. Seeds with seed ridges that tend to be parallel to the straight portion of the margin containing the hilum.

Potentilla recta
Potentilla recta. Seeds with seed ridges that tend to be parallel to the straight portion of the margin containing the hilum.

Primula sp. True seeds that are extremely fuzzy because of the high edges of the reticulum.

Primula sp.
Primula sp. True seeds that are extremely fuzzy because of the high edges of the reticulum.

Primula sp. Box-like true seeds with the hilum at the center of a flat surface.

Primula sp.
Primula sp. Box-like true seeds with the hilum at the center of a flat surface.

Proboscidea sp. Black and white true seeds with large and irregular reticulations with stipples.

Proboscidea sp.
Proboscidea sp. Black and white true seeds with large and irregular reticulations with stipples.

Prosopis alpataco. Light brown, oval-shaped seeds. Photo by Julia Scher, USDA-APHIS-PPQ.

Prosopis alpataco
Prosopis alpataco. Light brown, oval-shaped seeds. Photo by Julia Scher, USDA-APHIS-PPQ.

Prosopis alpataco. Hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.

Prosopis alpataco
Prosopis alpataco. Hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.

Prosopis alpataco. Seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.

Prosopis alpataco
Prosopis alpataco. Seeds in pods. Photo by Julia Scher, USDA-APHIS-PPQ.