The relatively very tall native, morning yellow-eyed-grass, is commonly found growing in flatwoods, savannas, bogs, and lake margins nearly throughout Florida (Wunderlin, 2003). Its large and very conspicuous cone-like inflorescences can be more than one inch long. Xyris ambigua blooms from spring to fall and occurs almost always (estimated probability 99%) under natural conditions in wetlands.
Morning yellow-eyed-grass is a yellow-eyed-grass. stems tufted, to 3 ft. tall, many ridges near base, 2-edged near tip, base hard and fibrous; leaf blades basal, spreading, broadly linear, to 16 in. long, to 3/4 in. wide, more or less pointed; sheaths 4-14 in. long; inflorescences cone-like, green to brown, to more than 1 in. long, many tight bracts; flowers 3-petalled, petals yellow and rounded, unfolding in morning; seeds tiny, shiny.