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Stems slender, cespitose, erect, 2–7 dm; some of the roots with subterminal tuberous thickenings; lvs terete, septate, 1–3 mm thick; infl narrowly pyramidal or ovoid, 1–12 cm, less than half as thick, congested to loosely branched, with 3–100 hemispheric or obpyramidal, 2–7-fld heads 3–5 mm thick; fls eprophyllate; tep subequal, lanceolate, 2.2–3 mm, aristulate, very narrowly scarious-margined; stamens 3; fr unilocular, dark purple-brown, prismatically oblong-trigonous, about equaling the tep, very abruptly short-acuminate or merely apiculate. Damp or wet, sandy or peaty soil, especially in pine-barrens; s. Del. to Fla. and Tex., chiefly on the coastal plain. Spring.
