Common Name: spiny amaranth, spiny pigweed
Scientific Name: Amaranthus spinosus L.
Family Name: Amaranthaceae - Amaranth Family

Identification Notes:

life cycle - introduced annual, reproducing by seed

stems - upright, branched, smooth, reddish, pair of sharp spines at nodes growth habit, spines

leaves - alternate, oval, entire, smooth, long petiole, often water-marked leaves 1, leaves 2

flowers - terminal spikes - green, small, mostly staminate (male); axillary clusters – green, small, mostly pistillate (female) female flower clusters, male flower clusters

Images:

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