Amaranthus greggii, or Gregg’s Amaranth, is an annual with long, succulent stems and fleshy, deeply veined leaves. Its inconspicuous flowers appear on long, bending stalks. The plant will grow on both the windward and leeward sides of dunes. Its stems often radiate outward over the sand.
References
Richardson, A. (2013). Wildflowers and other plants of Texas beaches and islands. Austin, TX: University of Texas Press.