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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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Ceanothus leucodermis. Seeds with a style segment attached to the hilum. Ceanothus leucodermis. Seeds with a style segment attached to the hilum.
Ceanothus leucodermis
Ceanothus leucodermis. Seeds with a style segment attached to the hilum.
Ceanothus megacarpus. Seeds with a dark attachment on the hilum. Ceanothus megacarpus. Seeds with a dark attachment on the hilum.
Ceanothus megacarpus
Ceanothus megacarpus. Seeds with a dark attachment on the hilum.
Ceanothus megacarpus.  Seeds with a slight longitudinal hump on the dorsal side. Ceanothus megacarpus. Seeds with a slight longitudinal hump on the dorsal side.
Ceanothus megacarpus
Ceanothus megacarpus. Seeds with a slight longitudinal hump on the dorsal side.
Ceanothus spinosus. Seeds with a dark-red attachment on the hilum. Ceanothus spinosus. Seeds with a dark-red attachment on the hilum.
Ceanothus spinosus
Ceanothus spinosus. Seeds with a dark-red attachment on the hilum.

Ceanothus thyrsiflorus. Shiny seeds with no longitudinal hump. Ceanothus thyrsiflorus. Shiny seeds with no longitudinal hump.
Ceanothus thyrsiflorus
Ceanothus thyrsiflorus. Shiny seeds with no longitudinal hump.
Celosia argentea. Seeds are shiny with very small reticulations. Celosia argentea. Seeds are shiny with very small reticulations.
Celosia argentea
Celosia argentea. Seeds are shiny with very small reticulations.
Celosia argentea. Seeds with a groove on the seed surface that separates the radicle and cotyledon lobes. Celosia argentea. Seeds with a groove on the seed surface that separates the radicle and cotyledon lobes.
Celosia argentea
Celosia argentea. Seeds with a groove on the seed surface that separates the radicle and cotyledon lobes.
Cenchrus caudatus. Florets with many filaments attached to the callus.  Cenchrus caudatus. Florets with many filaments attached to the callus. 
Cenchrus caudatus
Cenchrus caudatus. Florets with many filaments attached to the callus. 

Cenchrus caudatus. Florets with many filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Cenchrus caudatus. Florets with many filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus caudatus
Cenchrus caudatus. Florets with many filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus caudatus. Florets with many filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Cenchrus caudatus. Florets with many filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus caudatus
Cenchrus caudatus. Florets with many filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus caudatus.  Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ. Cenchrus caudatus. Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus caudatus
Cenchrus caudatus. Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus caudatus. Florets with many filaments attached to the callus. Cenchrus caudatus. Florets with many filaments attached to the callus.
Cenchrus caudatus
Cenchrus caudatus. Florets with many filaments attached to the callus.

Cenchrus echinatus. Burrs with long spines on the upper involucre, with many fine spines below. Caryopsis is also pictured.  Cenchrus echinatus. Burrs with long spines on the upper involucre, with many fine spines below. Caryopsis is also pictured. 
Cenchrus echinatus
Cenchrus echinatus. Burrs with long spines on the upper involucre, with many fine spines below. Caryopsis is also pictured. 
Cenchrus longispinus. Burrs with long and short spines. Caryopsis is also pictured. Cenchrus longispinus. Burrs with long and short spines. Caryopsis is also pictured.
Cenchrus longispinus
Cenchrus longispinus. Burrs with long and short spines. Caryopsis is also pictured.
Cenchrus longispinus.  Spikelets surrounded by a spiny cupule form the disseminule. Labeled. Photo courtesy of USDA-APHIS-PPQ. Cenchrus longispinus. Spikelets surrounded by a spiny cupule form the disseminule. Labeled. Photo courtesy of USDA-APHIS-PPQ.
Cenchrus longispinus
Cenchrus longispinus. Spikelets surrounded by a spiny cupule form the disseminule. Labeled. Photo courtesy of USDA-APHIS-PPQ.
Cenchrus pedicellatus. Unconditioned seed that have feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ. Cenchrus pedicellatus. Unconditioned seed that have feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus pedicellatus
Cenchrus pedicellatus. Unconditioned seed that have feathery filaments attached to the callus. Photo by Julia Scher, USDA-APHIS-PPQ.

Cenchrus pedicellatus. Shiny and smooth florets. Photo by Julia Scher, USDA-APHIS-PPQ. Cenchrus pedicellatus. Shiny and smooth florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus pedicellatus
Cenchrus pedicellatus. Shiny and smooth florets. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus pedicellatus. Florets with caryopses that have strong spatulate embryos over half their length. Photo by Julia Scher, USDA-APHIS-PPQ. Cenchrus pedicellatus. Florets with caryopses that have strong spatulate embryos over half their length. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus pedicellatus
Cenchrus pedicellatus. Florets with caryopses that have strong spatulate embryos over half their length. Photo by Julia Scher, USDA-APHIS-PPQ.
Cenchrus setaceus. Caryopses in dorsal view (left) showing embryo and in ventral view (right) showing hilum. Photo courtesy of USDA-APHIS-PPQ. Cenchrus setaceus. Caryopses in dorsal view (left) showing embryo and in ventral view (right) showing hilum. Photo courtesy of USDA-APHIS-PPQ.
Cenchrus setaceus
Cenchrus setaceus. Caryopses in dorsal view (left) showing embryo and in ventral view (right) showing hilum. Photo courtesy of USDA-APHIS-PPQ.
Cenchrus setaceus. Close-up of a plumose bristle. Photo courtesy of USDA-APHIS-PPQ. Cenchrus setaceus. Close-up of a plumose bristle. Photo courtesy of USDA-APHIS-PPQ.
Cenchrus setaceus
Cenchrus setaceus. Close-up of a plumose bristle. Photo courtesy of USDA-APHIS-PPQ.

Cenchrus spinifex. Burrs with many spines, caryopses are also pictured. Cenchrus spinifex. Burrs with many spines, caryopses are also pictured.
Cenchrus spinifex
Cenchrus spinifex. Burrs with many spines, caryopses are also pictured.
Cenchrus spinifex . Disseminule (cupule of fused bristles surrounding spikelets). Photo courtesy of USDA-APHIS-PPQ. Cenchrus spinifex. Disseminule (cupule of fused bristles surrounding spikelets). Photo courtesy of USDA-APHIS-PPQ.
Cenchrus spinifex
Cenchrus spinifex. Disseminule (cupule of fused bristles surrounding spikelets). Photo courtesy of USDA-APHIS-PPQ.
Centaurea stoebe subsp. australis. Achenes with blotchy surface colors. Centaurea stoebe subsp. australis. Achenes with blotchy surface colors.
Centaurea australis
Centaurea stoebe subsp. australis. Achenes with blotchy surface colors.
Centaurea calcitrapa. Achenes are smooth, dull to lustrous, white to light gray with various amounts of brown mottling.  Centaurea calcitrapa. Achenes are smooth, dull to lustrous, white to light gray with various amounts of brown mottling. 
Centaurea calcitrapa
Centaurea calcitrapa. Achenes are smooth, dull to lustrous, white to light gray with various amounts of brown mottling. 

Centaurea calcitrapa. Achenes are smooth, dull to lustrous, white to light gray with various amounts of brown mottling. No pappus. Centaurea calcitrapa. Achenes are smooth, dull to lustrous, white to light gray with various amounts of brown mottling. No pappus.
Centaurea calcitrapa
Centaurea calcitrapa. Achenes are smooth, dull to lustrous, white to light gray with various amounts of brown mottling. No pappus.
Centaurea calcitrapa. Fruits aligned with the stylar end at the top. Photo courtesy of USDA-APHIS-PPQ. Centaurea calcitrapa. Fruits aligned with the stylar end at the top. Photo courtesy of USDA-APHIS-PPQ.
Centaurea calcitrapa
Centaurea calcitrapa. Fruits aligned with the stylar end at the top. Photo courtesy of USDA-APHIS-PPQ.
Centaurea cyanus . Achenes are blue-gray with yellow longitudinal lines, a collar, and a base. Centaurea cyanus. Achenes are blue-gray with yellow longitudinal lines, a collar, and a base.
Centaurea cyanus
Centaurea cyanus. Achenes are blue-gray with yellow longitudinal lines, a collar, and a base.
Centaurea cyanus . Achenes with dense bristles and a slightly oblique, large scar. Centaurea cyanus. Achenes with dense bristles and a slightly oblique, large scar.
Centaurea cyanus
Centaurea cyanus. Achenes with dense bristles and a slightly oblique, large scar.

Centaurea diffusa. Achenes are oblong to obovate, compressed; smooth, lustrous, sparsely pubescent, brown to blackish-green with light colored longitudinal lines.  Centaurea diffusa. Achenes are oblong to obovate, compressed; smooth, lustrous, sparsely pubescent, brown to blackish-green with light colored longitudinal lines. 
Centaurea diffusa
Centaurea diffusa. Achenes are oblong to obovate, compressed; smooth, lustrous, sparsely pubescent, brown to blackish-green with light colored longitudinal lines. 
Centaurea iberica. Achenes are light brown with dark brown blotches and a few yellow stripes. Centaurea iberica. Achenes are light brown with dark brown blotches and a few yellow stripes.
Centaurea iberica
Centaurea iberica. Achenes are light brown with dark brown blotches and a few yellow stripes.
Centaurea iberica. Achenes with erect pappus bristles that are broad at the base. Centaurea iberica. Achenes with erect pappus bristles that are broad at the base.
Centaurea iberica
Centaurea iberica. Achenes with erect pappus bristles that are broad at the base.
Centaurea jacea. Achenes are covered with long waves.  Centaurea jacea. Achenes are covered with long waves. 
Centaurea jacea
Centaurea jacea. Achenes are covered with long waves. 

Centaurea macrocephala. Achenes are brown with a yellow base and longitudinal lines.  Centaurea macrocephala. Achenes are brown with a yellow base and longitudinal lines. 
Centaurea macrocephala
Centaurea macrocephala. Achenes are brown with a yellow base and longitudinal lines. 
Centaurea melitensis. Achenes with a scar notch that is lateral and hook-like. Centaurea melitensis. Achenes with a scar notch that is lateral and hook-like.
Centaurea melitensis
Centaurea melitensis. Achenes with a scar notch that is lateral and hook-like.
Centaurea melitensis. Looking into the center of the outer pappus whorls to see the innermost whorl covering the stylar remains. Photo courtesy of USDA-APHIS-PPQ. Centaurea melitensis. Looking into the center of the outer pappus whorls to see the innermost whorl covering the stylar remains. Photo courtesy of USDA-APHIS-PPQ.
Centaurea melitensis
Centaurea melitensis. Looking into the center of the outer pappus whorls to see the innermost whorl covering the stylar remains. Photo courtesy of USDA-APHIS-PPQ.
Centaurea nigra. Achenes are covered with a fine pubescence.  Centaurea nigra. Achenes are covered with a fine pubescence. 
Centaurea nigra
Centaurea nigra. Achenes are covered with a fine pubescence. 

Centaurea nigrescens. Achenes are smooth with longitudinal lines.  Centaurea nigrescens. Achenes are smooth with longitudinal lines. 
Centaurea nigrescens
Centaurea nigrescens. Achenes are smooth with longitudinal lines. 
Centaurea solstitialis. Ray flowers have a bristle pappus; ray flowers have no pappus. Centaurea solstitialis. Ray flowers have a bristle pappus; ray flowers have no pappus.
Centaurea solstitialis
Centaurea solstitialis. Ray flowers have a bristle pappus; ray flowers have no pappus.
Centaurea solstitialis. Achenes are brown to black or yellow to brown. Centaurea solstitialis. Achenes are brown to black or yellow to brown.
Centaurea solstitialis
Centaurea solstitialis. Achenes are brown to black or yellow to brown.
Centaurea solstitialis . Lateral view of fruit.  Pappus fruits with outer bristles removed to show the inner whorl. Photo courtesy of USDA-APHIS-PPQ. Centaurea solstitialis. Lateral view of fruit.  Pappus fruits with outer bristles removed to show the inner whorl. Photo courtesy of USDA-APHIS-PPQ.
Centaurea solstitialis
Centaurea solstitialis. Lateral view of fruit.  Pappus fruits with outer bristles removed to show the inner whorl. Photo courtesy of USDA-APHIS-PPQ.