Common Name: tall lettuce, wild lettuce, Canada lettuce
Scientific Name: Lactuca canadensis L.
Family Name: Asteraceae (Compositae) - Aster or Sunflower Family

Identification Notes:

life cycle - biennial, reproducing by seed

stems - upright, tall, leafy, smooth or coarse hairs, branched above during flowering growth habit

leaves - alternate, elongated, variable from entire, toothed or deeply cut pinnate lobes, smooth, blueish-green, veins sometimes sparsely haired below leaves

flowers - heads of yellow ray (ligulate) florets, heads urn-shaped; terminal clusters

other - contains milky sap

Images:

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