T: Tucumán, Leales, Chañar Pozo, Oct 1919, S.Venturi 427; lecto: LIL, fide M.Barros, Darwiniana 10: 371 (1953); iso: S.
Perennials, 15–30 (–35) cm tall, densely caespitose; rhizome ascending, 2–3 mm in diam., densely branched, covered with remains of old cataphylls; stem striate. Cataphylls scaly; upper cataphylls with auriculate sheaths, 2–6 cm long; Leaves basal, 1–2 with ±reduced blades, 2–4 normally developed, to c. 30 cm long, 1.0–1.4 mm wide, ±flat (with raised margins); sheaths ±loose; auricles obtuse, short, to c. 0.8 mm long, scarious. Lower bract leaf-like, longer than or equalling inflorescence, to 10 cm long. Inflorescence terminal or ±pseudolateral, composite or decomposite, 2–8 cm long, 5–30-flowered, loose, with 1–3 primary branches bearing loose sickle-shaped cymes; flowers borne singly. Tepals ±unequal; outer tepals longer, lanceolate, c. 3.5–4.5 mm long, acuminate, greenish; central band prominently 3-veined, later bordered stramineous-brownish; margins distinct, scarious. Stamens 3–5 (rarely 6); anthers oblong, c. 0.5 mm long; filaments flattened, c. 1.5 mm long; style c. 0.1 mm long; stigmas to 2 mm long. Capsule ellipsoid, triseptate, 3.5–4.0 mm long, subacute to subobtuse, shorter than perianth. Seed obliquely ovoid to ellipsoid, c. 0.3 × c. 0.2 mm, brown, slightly reticulate; appendages indistinct, very short.