Arizona Naturalists >>> Sonoran Desert Naturalist >>> Field Guide >>> Sonoran Desert Flora >>> Asteraceae >>> Lactuca serriola
Photographed along Mesquite Wash, Maricopa Co., Arizona. Aug. 1, 2009.
ANNUAL: A common to abundant weed of disturbed soils at roadsides, in
gardens, and along washes. Grows upright with few branches below. Plants
growing to nearly 2 m tall are not
Leaf of Prickly Lettuce seen near Pinetop, Arizona, Aug. 2009.
FLOWERS: Small, pale yellow, flower heads composed entirely of yellow
strap-shaped florets flared out pin-wheel fashion. The florets open early
morning in the desert and close before temperatures get too hot. The
inflorescence stems are stiff and wirey and widely branched into a panicle.
Flowering here late spring though fall.
Asteraceae -- Sunflower Family
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