Weed
spiny sowthistle, prickly sow thistle, prickly sowthistle, spiny-leaf sow-thistle, 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.
Obovate
Yellowish to brown
Smooth
Fine, longitudinal ribs present; apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
and base is narrow.
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. long obovate and compressed. Approximately three narrow, wide-spaced longitudinal ridges with flat area between ridges with no reticulations. Small 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. Color yellow to brown.
Not listed
Not included
For more information, see ISMA fact sheet.
Asteraceae
Sonchus asper (L.) Hill
Sonchus asper (L.) Hill ssp. asper
Sonchus asper (L.) Hill ssp. glaucescens (Jord.) J. Ball
Sonchus nymanii Tineo & Guss.
