T: Florida, A.W.Chapman s.n.; lecto: NY247634, designated here by S.E.Clemants; isolecto: GH29637.
Perennials, 30–90 cm tall, caespitose; rhizome much branched; older roots with ellipsoid to pyriform tuberiform distal thickenings. Cataphyll single, maroon to brown, lax, acute, often with a filiform blade to 5 mm long; basal leaves 1–3, 2–16 cm long; Cauline leaves 1–2, 2–16 cm long, compressed, perfectly septate (septa visible externally but not prominent), unitubular; tip acute; auricles 0.5–2 mm long, rounded, scarious. Lower bract leaf-like, lanceolate, 1–4 cm long, shorter than the inflorescence, erect to ascending; other bracts stramineous, narrowly ovate, 0.5–1.3 cm long. Inflorescence decompound to supradecompound, usually loose, rarely subdense, of 40–100 (–200) heads, (2–) 4–10 (–16) cm tall, with ascending to spreading branches; heads semiglobose to obpyramidal, 2–10-flowered, 3–5 mm in diam. Tepals unequal, lanceolate, greenish stramineous, later stramineous, often suffused reddish, acuminate; inner tepals (1.8–) 2.4–2.8 mm long; outer tepals (2.2–) 2.6–2.9 mm long. Stamens 3, not exserted; anthers 0.3–0.7 mm long; filaments 0.5–1.0 mm long; style 0.1–0.2 mm long; stigmas c. 0.6 mm long. Capsules unilocular, narrowly obpyriform to narrowly ovoid, abruptly narrowing in acute apex, 2.4–2.9 mm long, castaneous-brown, ±exceeding perianth. Seeds ellipsoid, apiculate, 0.4–0.6 × c. 0.2 mm, distinctly c. 13–16-striate, irregularly reticulate; appendages absent. 2n = 40, fide R.E.Brooks & S.E.Clemants, Fl. N. Amer. 22: 252 (2000).