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Common name

Noxious Weed Seed

AOSA Examination List

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Disseminule/Planting Unit

Shape

Seed length

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Brassica oleracea var. gemmifera. Seeds with a hilum that rises slightly above the seed surface.  Brassica oleracea var. gemmifera. Seeds with a hilum that rises slightly above the seed surface. 
Brassica oleracea var. gemmifera
Brassica oleracea var. gemmifera. Seeds with a hilum that rises slightly above the seed surface. 
Brassica oleracea var. gongylodes. Seeds with a narrow reticulum and stipples are not evident.  Brassica oleracea var. gongylodes. Seeds with a narrow reticulum and stipples are not evident. 
Brassica oleracea var. gongylodes
Brassica oleracea var. gongylodes. Seeds with a narrow reticulum and stipples are not evident. 
Brassica oleracea var. gongylodes. Seeds with a narrow reticulum and stipples are not evident.  Brassica oleracea var. gongylodes. Seeds with a narrow reticulum and stipples are not evident. 
Brassica oleracea var. gongylodes
Brassica oleracea var. gongylodes. Seeds with a narrow reticulum and stipples are not evident. 
Brassica oleracea var. viridis. Seeds with a reticulum present and stipples not evident.  Brassica oleracea var. viridis. Seeds with a reticulum present and stipples not evident. 
Brassica oleracea var. viridis
Brassica oleracea var. viridis. Seeds with a reticulum present and stipples not evident. 

Brassica oleracea var. viridis . Hilum. Photo by Madeline Maher, USDA-APHIS-PPQ. Brassica oleracea var. viridis. Hilum. Photo by Madeline Maher, USDA-APHIS-PPQ.
Brassica oleracea var. viridis
Brassica oleracea var. viridis. Hilum. Photo by Madeline Maher, USDA-APHIS-PPQ.
Brassica rapa. Seeds with stipples present on the reticulum and in the interspaces.  Brassica rapa. Seeds with stipples present on the reticulum and in the interspaces. 
Brassica rapa
Brassica rapa. Seeds with stipples present on the reticulum and in the interspaces. 
Brassica rapa.  Surface detail. Reddish-bronze seeds with stipples present on the reticulum and in the interspaces.  Brassica rapa. Surface detail. Reddish-bronze seeds with stipples present on the reticulum and in the interspaces. 
Brassica rapa
Brassica rapa. Surface detail. Reddish-bronze seeds with stipples present on the reticulum and in the interspaces. 
Brassica rapa. Seeds with stipples present on the reticulum and in the interspaces.  Brassica rapa. Seeds with stipples present on the reticulum and in the interspaces. 
Brassica rapa
Brassica rapa. Seeds with stipples present on the reticulum and in the interspaces. 

Brassica rapa subsp. chinensis. Reddish-brown seeds with a network of stipples. Brassica rapa subsp. chinensis. Reddish-brown seeds with a network of stipples.
Brassica rapa subsp. chinensis
Brassica rapa subsp. chinensis. Reddish-brown seeds with a network of stipples.
Brassica rapa subsp . nipposinica. Reddish-gray seeds with a weak reticulum and no stipples. Brassica rapa subsp. nipposinica. Reddish-gray seeds with a weak reticulum and no stipples.
Brassica rapa subsp. nipposinica
Brassica rapa subsp. nipposinica. Reddish-gray seeds with a weak reticulum and no stipples.
Brassica rapa subsp . nipposinica. Seeds with a weak reticulum and no stipples. Brassica rapa subsp. nipposinica. Seeds with a weak reticulum and no stipples.
Brassica rapa subsp. nipposinica
Brassica rapa subsp. nipposinica. Seeds with a weak reticulum and no stipples.
Brassica rapa subsp. oleifera. Seeds with a reticulum with stipples covering interspaces and a reticulum network. Brassica rapa subsp. oleifera. Seeds with a reticulum with stipples covering interspaces and a reticulum network.
Brassica rapa subsp. oleifera
Brassica rapa subsp. oleifera. Seeds with a reticulum with stipples covering interspaces and a reticulum network.

Brassica rapa subsp. pekinensis. Seeds with stipples on interspaces that are small, roundish, and shiny. Brassica rapa subsp. pekinensis. Seeds with stipples on interspaces that are small, roundish, and shiny.
Brassica rapa subsp. pekinensis
Brassica rapa subsp. pekinensis. Seeds with stipples on interspaces that are small, roundish, and shiny.
Brassica rapa subsp. pekinensis. Seeds with stipples on interspaces that are small, roundish, and shiny. Brassica rapa subsp. pekinensis. Seeds with stipples on interspaces that are small, roundish, and shiny.
Brassica rapa subsp. pekinensis
Brassica rapa subsp. pekinensis. Seeds with stipples on interspaces that are small, roundish, and shiny.
Brickellia californica. Achenes with numerous and long pappus hairs. Brickellia californica. Achenes with numerous and long pappus hairs.
Brickellia californica
Brickellia californica. Achenes with numerous and long pappus hairs.
Bromus anomalus.  Florets with uniformly spaced short hairs on the palea margins. Bromus anomalus. Florets with uniformly spaced short hairs on the palea margins.
Bromus anomalus
Bromus anomalus. Florets with uniformly spaced short hairs on the palea margins.

Bromus arizonicus. Florets with a rachilla scar surface that is parallel to the rachilla axis. Bromus arizonicus. Florets with a rachilla scar surface that is parallel to the rachilla axis.
Bromus arizonicus
Bromus arizonicus. Florets with a rachilla scar surface that is parallel to the rachilla axis.
Bromus arvensis. Brown, smooth florets. Bromus arvensis. Brown, smooth florets.
Bromus arvensis
Bromus arvensis. Brown, smooth florets.
Top- Bromus biebersteinii. Bottom- Bromus inermis . Florets with a hairy rachilla. Top-Bromus biebersteinii. Bottom-Bromus inermis. Florets with a hairy rachilla.
Bromus biebersteinii
Top-Bromus biebersteinii. Bottom-Bromus inermis. Florets with a hairy rachilla.
Top- Bromus biebersteinii. Bottom- Bromus inermis . 64X. Florets with strong, uniformly spaced teeth. Top-Bromus biebersteinii. Bottom-Bromus inermis. 64X. Florets with strong, uniformly spaced teeth.
Bromus biebersteinii
Top-Bromus biebersteinii. Bottom-Bromus inermis. 64X. Florets with strong, uniformly spaced teeth.

Bromus catharticus var. catharticus. Thick florets with conspicuous longitudinal nerves on the lemma. Bromus catharticus var. catharticus. Thick florets with conspicuous longitudinal nerves on the lemma.
Bromus catharticus var. catharticus
Bromus catharticus var. catharticus. Thick florets with conspicuous longitudinal nerves on the lemma.
Bromus catharticus var. catharticus. Florets are glabrous and smooth, sometimes with sparse and short hairs.  Bromus catharticus var. catharticus. Florets are glabrous and smooth, sometimes with sparse and short hairs. 
Bromus catharticus var. catharticus
Bromus catharticus var. catharticus. Florets are glabrous and smooth, sometimes with sparse and short hairs. 
Bromus catharticus var. catharticus. Florets are glabrous and smooth, sometimes with sparse and short hairs.  Bromus catharticus var. catharticus. Florets are glabrous and smooth, sometimes with sparse and short hairs. 
Bromus catharticus var. catharticus
Bromus catharticus var. catharticus. Florets are glabrous and smooth, sometimes with sparse and short hairs. 
Bromus catharticus var. elatus. Florets with a central lemma nerve that extends into an awn. Bromus catharticus var. elatus. Florets with a central lemma nerve that extends into an awn.
Bromus cebadilla
Bromus catharticus var. elatus. Florets with a central lemma nerve that extends into an awn.

Bromus ciliatus.  Floret is dorsal-ventrally compressed with a hairy callus. Bromus ciliatus. Floret is dorsal-ventrally compressed with a hairy callus.
Bromus ciliatus
Bromus ciliatus. Floret is dorsal-ventrally compressed with a hairy callus.
Bromus diandrus ssp. rigidus. Florets with short, hispid hairs on the lemma. Bromus diandrus ssp. rigidus. Florets with short, hispid hairs on the lemma.
Bromus diandrus subsp. rigidus
Bromus diandrus ssp. rigidus. Florets with short, hispid hairs on the lemma.
Bromus hordeaceus. Wrinkled florets with hair at the upper portion of the lemma. Bromus hordeaceus. Wrinkled florets with hair at the upper portion of the lemma.
Bromus hordeaceus
Bromus hordeaceus. Wrinkled florets with hair at the upper portion of the lemma.
Top- Bromus biebersteinii. Bottom- Bromus inermis Florets with many fine hairs on the palea. Top-Bromus biebersteinii. Bottom-Bromus inermis Florets with many fine hairs on the palea.
Bromus inermis subsp. inermis
Top-Bromus biebersteinii. Bottom-Bromus inermis Florets with many fine hairs on the palea.

Top- Bromus biebersteinii. Bottom- Bromus inermis . 64X. Florets with many fine hairs on the palea. Top-Bromus biebersteinii. Bottom-Bromus inermis. 64X. Florets with many fine hairs on the palea.
Bromus inermis subsp. inermis
Top-Bromus biebersteinii. Bottom-Bromus inermis. 64X. Florets with many fine hairs on the palea.
Bromus inermis ssp. inermis. Dorsal view of two caryopses showing the longitudinal groove. Photo courtesy of USDA-APHIS-PPQ. Bromus inermis ssp. inermis. Dorsal view of two caryopses showing the longitudinal groove. Photo courtesy of USDA-APHIS-PPQ.
Bromus inermis subsp. inermis
Bromus inermis ssp. inermis. Dorsal view of two caryopses showing the longitudinal groove. Photo courtesy of USDA-APHIS-PPQ.
Bromus marginatus. Florets with smooth and sparsely appressed pubescence.  Bromus marginatus. Florets with smooth and sparsely appressed pubescence. 
Bromus marginatus
Bromus marginatus. Florets with smooth and sparsely appressed pubescence. 
Bromus racemosus. Florets with an awn arising near the terminal end of the lemma.  Bromus racemosus. Florets with an awn arising near the terminal end of the lemma. 
Bromus racemosus
Bromus racemosus. Florets with an awn arising near the terminal end of the lemma. 

Bromus secalinus. Florets with a rachilla that's bowed with a large scar. Bromus secalinus. Florets with a rachilla that's bowed with a large scar.
Bromus secalinus
Bromus secalinus. Florets with a rachilla that's bowed with a large scar.
Bromus tectorum. Florets with a copiously soft and pubescent lemma.  Bromus tectorum. Florets with a copiously soft and pubescent lemma. 
Bromus tectorum
Bromus tectorum. Florets with a copiously soft and pubescent lemma. 
Bromus tectorum. Close-up of base of floret, ventral (left) and lateral (right) views. Photo courtesy of USDA-APHIS-PPQ. Bromus tectorum. Close-up of base of floret, ventral (left) and lateral (right) views. Photo courtesy of USDA-APHIS-PPQ.
Bromus tectorum
Bromus tectorum. Close-up of base of floret, ventral (left) and lateral (right) views. Photo courtesy of USDA-APHIS-PPQ.
Browallia sp. Seeds are covered with small tubercles.  Browallia sp. Seeds are covered with small tubercles. 
Browallia sp.
Browallia sp. Seeds are covered with small tubercles. 

Buglossoides arvensis. The warty surface of the nutlet is light brown, and the dome is olive brown.  Buglossoides arvensis. The warty surface of the nutlet is light brown, and the dome is olive brown. 
Buglossoides arvensis
Buglossoides arvensis. The warty surface of the nutlet is light brown, and the dome is olive brown. 
Buglossoides arvensis. Nutlets are longitudinally warty with a smooth dome on the apex.  Buglossoides arvensis. Nutlets are longitudinally warty with a smooth dome on the apex. 
Buglossoides arvensis
Buglossoides arvensis. Nutlets are longitudinally warty with a smooth dome on the apex. 
Cajanus cajan . Seeds with a large hilum with bulky tissue. Cajanus cajan. Seeds with a large hilum with bulky tissue.
Cajanus cajan
Cajanus cajan. Seeds with a large hilum with bulky tissue.
Calamagrostis stricta ssp . inexpansa.  Florets with long hairs from the callus. Calamagrostis stricta ssp. inexpansa. Florets with long hairs from the callus.
Calamagrostis stricta subsp. inexpansa
Calamagrostis stricta ssp. inexpansa. Florets with long hairs from the callus.