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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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Bidens bipinnata. Long achenes with a large ring at the base and two or three strong, barbed awns.  Bidens bipinnata. Long achenes with a large ring at the base and two or three strong, barbed awns. 
Bidens bipinnata
Bidens bipinnata. Long achenes with a large ring at the base and two or three strong, barbed awns. 
Bidens cernua. Achenes with four longitudinal ribs and barbed awns. Bidens cernua. Achenes with four longitudinal ribs and barbed awns.
Bidens cernua
Bidens cernua. Achenes with four longitudinal ribs and barbed awns.
Bidens frondosa. Achenes with barbed awns that are a continuation of the achene's outer margin. Bidens frondosa. Achenes with barbed awns that are a continuation of the achene's outer margin.
Bidens frondosa
Bidens frondosa. Achenes with barbed awns that are a continuation of the achene's outer margin.
Bolboschoenus fluviatilis. Achenes with three to six bristles appressed to the surface and base. Bolboschoenus fluviatilis. Achenes with three to six bristles appressed to the surface and base.
Bolboschoenus fluviatilis
Bolboschoenus fluviatilis. Achenes with three to six bristles appressed to the surface and base.

Bolboschoenus fluviatilis. Gray to black achenes with three to six bristles appressed to the surface and base. Bolboschoenus fluviatilis. Gray to black achenes with three to six bristles appressed to the surface and base.
Bolboschoenus fluviatilis
Bolboschoenus fluviatilis. Gray to black achenes with three to six bristles appressed to the surface and base.
Bolboschoenus maritimus. Achenes are smooth or with small stipples. Bolboschoenus maritimus. Achenes are smooth or with small stipples.
Bolboschoenus maritimus
Bolboschoenus maritimus. Achenes are smooth or with small stipples.
Bolboschoenus maritimus. Achenes with no bristles. Bolboschoenus maritimus. Achenes with no bristles.
Bolboschoenus maritimus
Bolboschoenus maritimus. Achenes with no bristles.
From Left to Right: 1.  Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus lacustris . Dark brown achenes. From Left to Right: 1. Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus lacustris. Dark brown achenes.
Bolboschoenus robustus
From Left to Right: 1. Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus lacustris. Dark brown achenes.

Bolboschoenus robustus. Smooth achenes with remnants of scar and style. Bolboschoenus robustus. Smooth achenes with remnants of scar and style.
Bolboschoenus robustus
Bolboschoenus robustus. Smooth achenes with remnants of scar and style.
Borago officinalis. Nutlets have strong and irregular longitudinal ribs with warty interspaces. Borago officinalis. Nutlets have strong and irregular longitudinal ribs with warty interspaces.
Borago officinalis
Borago officinalis. Nutlets have strong and irregular longitudinal ribs with warty interspaces.
Bothriochloa bladhii. Spikelets with hairy attachments and callus. Bothriochloa bladhii. Spikelets with hairy attachments and callus.
Bothriochloa bladhii
Bothriochloa bladhii. Spikelets with hairy attachments and callus.
Bothriochloa bladhii. Spikelets with hairy attachments and callus. Bothriochloa bladhii. Spikelets with hairy attachments and callus.
Bothriochloa bladhii
Bothriochloa bladhii. Spikelets with hairy attachments and callus.

From Left to Right: 1. Andropogon gerardii 2. Andropogon hallii 3. Sorghastrum nutans 4. Schizachyrium scoparium 5, Bothriochloa ischaemum . Spikelets with smooth glumes and a hairy attachment and callus. From Left to Right: 1. Andropogon gerardii 2. Andropogon hallii 3. Sorghastrum nutans 4. Schizachyrium scoparium 5, Bothriochloa ischaemum. Spikelets with smooth glumes and a hairy attachment and callus.
Bothriochloa ischaemum
From Left to Right: 1. Andropogon gerardii 2. Andropogon hallii 3. Sorghastrum nutans 4. Schizachyrium scoparium 5, Bothriochloa ischaemum. Spikelets with smooth glumes and a hairy attachment and callus.
Bothriochloa ischaemum. The Bothriochloa ischaemum. The "seed unit" is complex and consists of (from outer to inner) a short pedicel (which usually is sterile), a segment of the rachis, a pair of glumes, a sterile lemma, a fertile lemma, a small palea (sometimes lacking), and finally the caryopsis.
Bothriochloa ischaemum
Bothriochloa ischaemum. The "seed unit" is complex and consists of (from outer to inner) a short pedicel (which usually is sterile), a segment of the rachis, a pair of glumes, a sterile lemma, a fertile lemma, a small palea (sometimes lacking), and finally the caryopsis.
Bouteloua aristidoides. Pubescent florets. Bouteloua aristidoides. Pubescent florets.
Bouteloua aristidoides
Bouteloua aristidoides. Pubescent florets.
Bouteloua aristidoides. Florets are embedded in a structure with a large, bent barb. Bouteloua aristidoides. Florets are embedded in a structure with a large, bent barb.
Bouteloua aristidoides
Bouteloua aristidoides. Florets are embedded in a structure with a large, bent barb.

Bouteloua curtipendula. Spikelet, double floret, and an oval caryopsis.  Bouteloua curtipendula. Spikelet, double floret, and an oval caryopsis. 
Bouteloua curtipendula
Bouteloua curtipendula. Spikelet, double floret, and an oval caryopsis. 
Bouteloua dactyloides. Top left: florets. Top right: caryopsis Bottom: burrs. This seed unit is a collection of spikelets that are compressed together into a ball or burr. Bouteloua dactyloides. Top left: florets. Top right: caryopsis Bottom: burrs. This seed unit is a collection of spikelets that are compressed together into a ball or burr.
Bouteloua dactyloides
Bouteloua dactyloides. Top left: florets. Top right: caryopsis Bottom: burrs. This seed unit is a collection of spikelets that are compressed together into a ball or burr.
From Left to Right: 1. and 4. Bouteloua eriopoda 2. and 3. Bouteloua gracilis. Florets with three lateral bristles.  From Left to Right: 1. and 4. Bouteloua eriopoda 2. and 3. Bouteloua gracilis. Florets with three lateral bristles. 
Bouteloua eriopoda
From Left to Right: 1. and 4. Bouteloua eriopoda 2. and 3. Bouteloua gracilis. Florets with three lateral bristles. 
Bouteloua eriopoda. Florets with smooth, short bristles at the callus.  Bouteloua eriopoda. Florets with smooth, short bristles at the callus. 
Bouteloua eriopoda
Bouteloua eriopoda. Florets with smooth, short bristles at the callus. 

From Left to Right: 1. and 4. Bouteloua eriopoda 2. and 3. Bouteloua gracilis. Florets with three bristles are associated with the two lateral and central nerves of the basal floret, and three are associated with the remnants of the secondary floret attached to the rachilla of the basal floret. From Left to Right: 1. and 4. Bouteloua eriopoda 2. and 3. Bouteloua gracilis. Florets with three bristles are associated with the two lateral and central nerves of the basal floret, and three are associated with the remnants of the secondary floret attached to the rachilla of the basal floret.
Bouteloua gracilis
From Left to Right: 1. and 4. Bouteloua eriopoda 2. and 3. Bouteloua gracilis. Florets with three bristles are associated with the two lateral and central nerves of the basal floret, and three are associated with the remnants of the secondary floret attached to the rachilla of the basal floret.
Bouteloua gracilis. Florets with many hairs on the callus and three bristles associated with the two lateral and central nerves of the basal floret.  Bouteloua gracilis. Florets with many hairs on the callus and three bristles associated with the two lateral and central nerves of the basal floret. 
Bouteloua gracilis
Bouteloua gracilis. Florets with many hairs on the callus and three bristles associated with the two lateral and central nerves of the basal floret. 
Bouteloua rothrockii. The sterile floret has remnants of a lemma and palea and well-developed awns. Bouteloua rothrockii. The sterile floret has remnants of a lemma and palea and well-developed awns.
Bouteloua rothrockii
Bouteloua rothrockii. The sterile floret has remnants of a lemma and palea and well-developed awns.
Bouteloua rothrockii. The sterile floret has remnants of a lemma and palea and well-developed awns. Bouteloua rothrockii. The sterile floret has remnants of a lemma and palea and well-developed awns.
Bouteloua rothrockii
Bouteloua rothrockii. The sterile floret has remnants of a lemma and palea and well-developed awns.

Bouteloua rothrockii. The sterile floret has remnants of a lemma and palea and well-developed awns. Bouteloua rothrockii. The sterile floret has remnants of a lemma and palea and well-developed awns.
Bouteloua rothrockii
Bouteloua rothrockii. The sterile floret has remnants of a lemma and palea and well-developed awns.
Brachyscome iberidifolia. Gray achenes with longitudinal ribs and a pappus ring. Brachyscome iberidifolia. Gray achenes with longitudinal ribs and a pappus ring.
Brachyscome iberidifolia
Brachyscome iberidifolia. Gray achenes with longitudinal ribs and a pappus ring.
Bracteantha bracteata.  Achenes with parallel sides and few longitudinal ribs. Bracteantha bracteata. Achenes with parallel sides and few longitudinal ribs.
Bracteantha bracteata
Bracteantha bracteata. Achenes with parallel sides and few longitudinal ribs.
Brassica juncea.  Seeds with small stipples. Brassica juncea. Seeds with small stipples.
Brassica juncea
Brassica juncea. Seeds with small stipples.

Brassica juncea.  Seeds with small stipples. Brassica juncea. Seeds with small stipples.
Brassica juncea
Brassica juncea. Seeds with small stipples.
From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea . Brown seeds with small stipples. From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea. Brown seeds with small stipples.
Brassica juncea
From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea. Brown seeds with small stipples.
From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea 4. Brassica rapa subsp. campestris. Spherical or elongate seeds. From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea 4. Brassica rapa subsp. campestris. Spherical or elongate seeds.
Brassica juncea
From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea 4. Brassica rapa subsp. campestris. Spherical or elongate seeds.
Brassica napus. Seeds with large stipples. Brassica napus. Seeds with large stipples.
Brassica napus
Brassica napus. Seeds with large stipples.

Brassica napus. Seeds with large stipples. Brassica napus. Seeds with large stipples.
Brassica napus
Brassica napus. Seeds with large stipples.
Brassica napus. Close-up of hilar region on two seeds. Photo courtesy of USDA-APHIS-PPQ. Brassica napus. Close-up of hilar region on two seeds. Photo courtesy of USDA-APHIS-PPQ.
Brassica napus
Brassica napus. Close-up of hilar region on two seeds. Photo courtesy of USDA-APHIS-PPQ.
Brassica napus subsp. rapifera. Seeds with small, rectangular, and shiny stipples. Brassica napus subsp. rapifera. Seeds with small, rectangular, and shiny stipples.
Brassica napus subsp. rapifera
Brassica napus subsp. rapifera. Seeds with small, rectangular, and shiny stipples.
Brassica napus  var. pabularia. Seeds with a fine reticulum and stipples. Brassica napus var. pabularia. Seeds with a fine reticulum and stipples.
Brassica napus var. pabularia
Brassica napus var. pabularia. Seeds with a fine reticulum and stipples.

From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea. Seeds with shiny stipples present in the interspaces but not on the reticulum. From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea. Seeds with shiny stipples present in the interspaces but not on the reticulum.
Brassica nigra
From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea. Seeds with shiny stipples present in the interspaces but not on the reticulum.
From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea 4. Brassica rapa subsp. campestris. Seeds with small, shiny stipples. From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea 4. Brassica rapa subsp. campestris. Seeds with small, shiny stipples.
Brassica nigra
From Left to Right: 1. Brassica nigra 2. Sinapis arvensis 3. Brassica juncea 4. Brassica rapa subsp. campestris. Seeds with small, shiny stipples.
Brassica oleracea. Bronze seeds with spherical hilums. Brassica oleracea. Bronze seeds with spherical hilums.
Brassica oleracea
Brassica oleracea. Bronze seeds with spherical hilums.
Brassica oleracea.  Seeds with a narrow reticulum, stipples not evident. Brassica oleracea. Seeds with a narrow reticulum, stipples not evident.
Brassica oleracea
Brassica oleracea. Seeds with a narrow reticulum, stipples not evident.