Latin name: Sonchus oleraceae
  Family: Asteraceae
  Common name: Annual sowthistle
  Life cycle: annual, spreads by seed
Habit: initially a rosette, then upright and columnar
Foliage: Cauline foliage is deltoid in shape, clasps the stem, and has shallow pointed lobes. Despite its appearance, it is not prickly or spiny, and does not hurt to touch or squeeze.
Flowers: Flower heads occur in clusters and are composed of yellow ray flowers.
  Notes: This is a very common species in Oregon field nurseries, and is becoming more common in container crops. Seed are air-borne, thus local sanitation around the nursery is imperative for effective control.

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