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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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Carduus acanthoides. Achenes with an apical rim that is lighter yellow than the rest of the achene.  Carduus acanthoides. Achenes with an apical rim that is lighter yellow than the rest of the achene. 
Carduus acanthoides
Carduus acanthoides. Achenes with an apical rim that is lighter yellow than the rest of the achene. 
Carduus nutans.  Achenes with a large stylar lobe with a brown apical collar. Carduus nutans. Achenes with a large stylar lobe with a brown apical collar.
Carduus nutans
Carduus nutans. Achenes with a large stylar lobe with a brown apical collar.
From Left to Right: 1. Cirsium arvense 2. Carduus nutans 3. Cirsium vulgare 4. Cirsium undulatum . Achenes with small transverse waves.  From Left to Right: 1. Cirsium arvense 2. Carduus nutans 3. Cirsium vulgare 4. Cirsium undulatum. Achenes with small transverse waves. 
Carduus nutans
From Left to Right: 1. Cirsium arvense 2. Carduus nutans 3. Cirsium vulgare 4. Cirsium undulatum. Achenes with small transverse waves. 
Carduus nutans.  Achenes are glossy, honey-brown with numerous dark brown longitudinal lines. Carduus nutans. Achenes are glossy, honey-brown with numerous dark brown longitudinal lines.
Carduus nutans
Carduus nutans. Achenes are glossy, honey-brown with numerous dark brown longitudinal lines.

Top: Carduus nutans 1. Cirsium undulatum 2. Cirsium vulga re 3. Cirsium arvense.  Top: Carduus nutans 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense. 
Carduus nutans
Top: Carduus nutans 1. Cirsium undulatum 2. Cirsium vulgare 3. Cirsium arvense. 
Carduus pycnocephalus. From Left to Right: 1. Ray flower achene 2. Disc flower achene. Achenes with a large stylar lobe and a brown collar. Carduus pycnocephalus. From Left to Right: 1. Ray flower achene 2. Disc flower achene. Achenes with a large stylar lobe and a brown collar.
Carduus pycnocephalus
Carduus pycnocephalus. From Left to Right: 1. Ray flower achene 2. Disc flower achene. Achenes with a large stylar lobe and a brown collar.
Carduus tenuiflorus. Achenes are smooth and glossy, with transverse wavy lines. Carduus tenuiflorus. Achenes are smooth and glossy, with transverse wavy lines.
Carduus tenuiflorus
Carduus tenuiflorus. Achenes are smooth and glossy, with transverse wavy lines.
Carex annectens. A papery perigynium often covers the achene. Carex annectens. A papery perigynium often covers the achene.
Carex annectens
Carex annectens. A papery perigynium often covers the achene.

Carex aquatilis. Achene with fine lines of reticulations. Carex aquatilis. Achene with fine lines of reticulations.
Carex aquatilis
Carex aquatilis. Achene with fine lines of reticulations.
Carex bicknellii. Perigynium is elliptic and ribbed, achene is flat. Carex bicknellii. Perigynium is elliptic and ribbed, achene is flat.
Carex bicknellii
Carex bicknellii. Perigynium is elliptic and ribbed, achene is flat.
Carex comosa.  Achenes with long, persistent styles. Carex comosa. Achenes with long, persistent styles.
Carex comosa
Carex comosa. Achenes with long, persistent styles.
Carex crus-corvi. Flat achenes with a large, puffed base and a long apex as the perigynium. Carex crus-corvi. Flat achenes with a large, puffed base and a long apex as the perigynium.
Carex crus-corvi
Carex crus-corvi. Flat achenes with a large, puffed base and a long apex as the perigynium.

Carex festucacea. Papery and smooth achenes. Carex festucacea. Papery and smooth achenes.
Carex festucacea
Carex festucacea. Papery and smooth achenes.
Carex hystericina. Achene perigynium has several longitudinal ribs and a long neck, which splits at the apex. Carex hystericina. Achene perigynium has several longitudinal ribs and a long neck, which splits at the apex.
Carex hystericina
Carex hystericina. Achene perigynium has several longitudinal ribs and a long neck, which splits at the apex.
Carex lacustris. Achenes with a lanceolate perigynium with fine longitudinal lines. Carex lacustris. Achenes with a lanceolate perigynium with fine longitudinal lines.
Carex lacustris
Carex lacustris. Achenes with a lanceolate perigynium with fine longitudinal lines.
Carex lupulina. Achene with a strong, persistent style. Carex lupulina. Achene with a strong, persistent style.
Carex lupulina
Carex lupulina. Achene with a strong, persistent style.

Carex praegracilis. Achene perigynium is small with a short style and faint ribs. Carex praegracilis. Achene perigynium is small with a short style and faint ribs.
Carex praegracilis
Carex praegracilis. Achene perigynium is small with a short style and faint ribs.
Carex scirpoidea. Achene perigynium is elliptic and covered with coarse and appressed hairs. Carex scirpoidea. Achene perigynium is elliptic and covered with coarse and appressed hairs.
Carex scirpoidea
Carex scirpoidea. Achene perigynium is elliptic and covered with coarse and appressed hairs.
Carex shortiana. Achenes with light brown corners. Carex shortiana. Achenes with light brown corners.
Carex shortiana
Carex shortiana. Achenes with light brown corners.
Carex simulata. Achene perigynium has a serrate margin near the apex.  Carex simulata. Achene perigynium has a serrate margin near the apex. 
Carex simulata
Carex simulata. Achene perigynium has a serrate margin near the apex. 

Carex utriculata. Achenes with an elliptic perigynium with longitudinal ribs. Carex utriculata. Achenes with an elliptic perigynium with longitudinal ribs.
Carex utriculata
Carex utriculata. Achenes with an elliptic perigynium with longitudinal ribs.
Carex vulpinoidea. Achenes with an obovate perigynium with longitudinal ribs.  Carex vulpinoidea. Achenes with an obovate perigynium with longitudinal ribs. 
Carex vulpinoidea
Carex vulpinoidea. Achenes with an obovate perigynium with longitudinal ribs. 
Carica papaya. Seeds with irregular, wide, deep reticulations. Carica papaya. Seeds with irregular, wide, deep reticulations.
Carica papaya
Carica papaya. Seeds with irregular, wide, deep reticulations.
Carthamus creticus. Achenes with sharp pappus scales perpendicular to the axis.  Carthamus creticus. Achenes with sharp pappus scales perpendicular to the axis. 
Carthamus creticus
Carthamus creticus. Achenes with sharp pappus scales perpendicular to the axis. 

Carthamus lanatus. Achenes with a wide apical collar that surrounds the apex.  Carthamus lanatus. Achenes with a wide apical collar that surrounds the apex. 
Carthamus lanatus
Carthamus lanatus. Achenes with a wide apical collar that surrounds the apex. 
Carthamus leucocaulos. Achenes with a papery pappus arising perpendicular to the axis.  Carthamus leucocaulos. Achenes with a papery pappus arising perpendicular to the axis. 
Carthamus leucocaulos
Carthamus leucocaulos. Achenes with a papery pappus arising perpendicular to the axis. 
Carthamus oxyacanthus. Achenes with a long hilum that is lateral to the base. Photo by Julia Scher, USDA-APHIS-PPQ. Carthamus oxyacanthus. Achenes with a long hilum that is lateral to the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Carthamus oxyacanthus
Carthamus oxyacanthus. Achenes with a long hilum that is lateral to the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Carthamus oxyacanthus. Achenes with a long hilum that is lateral to the base. Photo by Julia Scher, USDA-APHIS-PPQ. Carthamus oxyacanthus. Achenes with a long hilum that is lateral to the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Carthamus oxyacanthus
Carthamus oxyacanthus. Achenes with a long hilum that is lateral to the base. Photo by Julia Scher, USDA-APHIS-PPQ.

Carthamus oxyacanthus.  White achenes with various amounts of black blotches. Photo by Julia Scher, USDA-APHIS-PPQ. Carthamus oxyacanthus. White achenes with various amounts of black blotches. Photo by Julia Scher, USDA-APHIS-PPQ.
Carthamus oxyacanthus
Carthamus oxyacanthus. White achenes with various amounts of black blotches. Photo by Julia Scher, USDA-APHIS-PPQ.
Carthamus tinctorius.  White achenes with yellow ridges. Photo by Julia Scher, USDA-APHIS-PPQ. Carthamus tinctorius. White achenes with yellow ridges. Photo by Julia Scher, USDA-APHIS-PPQ.
Carthamus tinctorius
Carthamus tinctorius. White achenes with yellow ridges. Photo by Julia Scher, USDA-APHIS-PPQ.
Carthamus tinctorius. Achenes with a pappus of several rows of narrow scales. Photo by Julia Scher, USDA-APHIS-PPQ. Carthamus tinctorius. Achenes with a pappus of several rows of narrow scales. Photo by Julia Scher, USDA-APHIS-PPQ.
Carthamus tinctorius
Carthamus tinctorius. Achenes with a pappus of several rows of narrow scales. Photo by Julia Scher, USDA-APHIS-PPQ.
Carthamus tinctorius . White achenes. Carthamus tinctorius. White achenes.
Carthamus tinctorius
Carthamus tinctorius. White achenes.

Carum carvi. Mericarps with five yellow ribs and brown interspaces. Carum carvi. Mericarps with five yellow ribs and brown interspaces.
Carum carvi
Carum carvi. Mericarps with five yellow ribs and brown interspaces.
Castilleja integra. Seeds with a fragile net covering, with an overall conical shape. Castilleja integra. Seeds with a fragile net covering, with an overall conical shape.
Castilleja integra
Castilleja integra. Seeds with a fragile net covering, with an overall conical shape.
Castilleja sp. Achenes with a honeycomb texture on the outer covering. Castilleja sp. Achenes with a honeycomb texture on the outer covering.
Castilleja sp.
Castilleja sp. Achenes with a honeycomb texture on the outer covering.
Castilleja sp. Achenes with a honeycomb texture on the outer covering. Castilleja sp. Achenes with a honeycomb texture on the outer covering.
Castilleja sp.
Castilleja sp. Achenes with a honeycomb texture on the outer covering.

Catharanthus roseus. Seeds with large, irregular ribs covered with fine stipples. Catharanthus roseus. Seeds with large, irregular ribs covered with fine stipples.
Catharanthus roseus
Catharanthus roseus. Seeds with large, irregular ribs covered with fine stipples.
Ceanothus crassifolius. Seeds with a slight longitudinal hump on the dorsal side. Ceanothus crassifolius. Seeds with a slight longitudinal hump on the dorsal side.
Ceanothus crassifolius
Ceanothus crassifolius. Seeds with a slight longitudinal hump on the dorsal side.
Ceanothus greggii. Seeds with white hilums. Ceanothus greggii. Seeds with white hilums.
Ceanothus greggii
Ceanothus greggii. Seeds with white hilums.
Ceanothus impressus. Seeds with a style segment attached to the hilum. Ceanothus impressus. Seeds with a style segment attached to the hilum.
Ceanothus impressus
Ceanothus impressus. Seeds with a style segment attached to the hilum.