L., Sp. Pl. 1046. 1753
Densely tufted, erect perennial, 80-150 cm tall; mostly glabrous. Lower leaves in basal cluster; sheaths flattened, keeled, glabrous or hirsute, much shorter than the internodes; blades 15-30 cm or more long (basal leaves longest), to 4 mm wide, the margins obscurely scabridulous. Inflorescences loose and elongate, the flowering branches from the middle to upper nodes; racemes paired, slender, spreading, often partly enclosed in a slender spathe, the spathe exceeding the raceme; rachis flexuous, the ultimate branches glabrous just below the spathes; spikelets paired, one sessile and perfect, 3-4 mm long, the other pedicellate and staminate (soon falling); awn straight, 1-1.5 cm long; first glume acuminate. Fruits narrowly oblong, tan, ca 1 mm long. Ebinger 590.
Collected once near the shore in the Drayton House Clearing. Apparently less abundant in Panama than A. glomeratus. Seasonal behavior unknown, probably flowers during the rainy season.
Eastern United States and Mexico to Panama; West Indies; Hawaii. In Panama, known from tropical moist forest in the Canal Zone and Panama (doubtless elsewhere) and from premontane wet forest in Panama (slopes of Cerro Campana).