Weed
field sowthistle, sowthistle, creeping sowthistle, perennial sowthistle
AcheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat.
Oblong
Brown, with white apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
and base
Ribs and interspaces densely tuberculateTuberculate:
Having small pimple-like protuberances.
Longitudinal ribs present; truncated base and apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar..
AchenesAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat. oblong. Approximately 5 longitudinal ridges per side with deep and narrow creases between ridges. Cross reticulations on ridges. Broad pappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
and basalBasal:
The base of the fruit or seed opposite the apical end.
attachments.
State Noxious Weed: Alaska, California, Colorado, Connecticut, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Maine, Massachusetts, Michigan, Minnesota, Montana, North Dakota, New Hampshire, Nevada, Ohio, Oregon, Pennsylvania, Rhode Island, South Dakota, Vermont, Washington, West Virginia, Wisconsin, Wyoming
Federal: This species is actionable only when found in field or vegetable seed for planting; toleranceTolerance:
The amount by which a second test may differ from a first test without being attributed to an actual difference in seed quality. Tolerances are usually based on normal random variation, or sampling error.
applies, see (7 CFR 361.6(a)(2)).
Learn more on ITP's Federal Noxious Weed Disseminules tool.
Included
For more information, see ISMA fact sheet.
Asteraceae
Sonchus arvensis L.
