Gaudichaud-Beaupre, C., French naturalist (1789–1854).
WCM Protologue Reference:
Kunth, Enum. Pl. 3: 387 (1841)
Vegetative parts: plants tangled, 0.3–1.2 m tall, basal diameter 0.3–1 m, crown diameter 0.3–1.2 m, compact, without spreading rhizomes or stolons or with stolons. Fertile culms branching or much branched, round (not compressed), solid or with a small central cavity, smooth or finely rugulose or finely warty (large culms are generally smooth while thinner ones tend to have a more bumpy/verruculose surface), green or olivaceous, 0.5–1.5 m tall, diameter at base 1.8–3.5 mm, diameter at apex 0.1–0.7 mm, terminal parts flexuose. Clusters of sterile branches at the nodes of the fertile branches absent. Sheaths loosely convoluted, 2.5–15 mm long, orange to reddish-brown with tan speckles and yellowish/tan widely flaring margins, upper 1/3 in colour and texture similar to the lower 2/3, apical margins narrowly membranous or broadly membranous, hyaline shoulders tall, acute, apex, excluding the membranous lobes, acute or obtuse. Sheath-mucro penicellate or hair-like (quite slender), straight and erect, 0.8–4 mm long. Males: male inflorescence with 2–5 spikelets or 6–10 spikelets or 11–20 spikelets or 21–50 spikelets, racemose or paniculate, 10–50 mm long, 2–8 mm wide. Male inflorescence spathes persistent, shorter than spikelets, coriaceous or cartilaginous. Male spathellae inconspicuous or absent. Male flowers in spikelets. Male spikelets erect on stiff pedicels or sessile, linear or oblong or elliptical, at least some curved, apex acute or undifferentiated, 2–8 mm, 0.8–1.5 mm, with 5–15 flowers, pedicels shorter than the spikelets or as long as the spikelets, flattened. Male bracts taller than flowers, 1.5–2.5 mm long, elliptical or ovate or orbicular, rounded or obtuse, chartaceous or cartilaginous, bract upper margin membranous, thinner texture than the body, bract awn minute or absent. Male flower 1.3–2 mm long. Male tepals sepals more rigid than petals (slightly), cartilaginous, petals chartaceous, oblong or elliptical or ovate, inner and outer tepals the same length. Male outer lateral tepals conduplicate, keel sparsely villous or keel densely villous. Anthers 0.5–1.3 mm long, exserted from the flowers. Females: female inflorescence interrupted or linear, 3–35 mm long, 2–15 mm wide, with 1 spikelet or 2–5 spikelets or 6–10 spikelets (frequently single). Female spathes shorter than the spikelets, persistent, coriaceous or cartilaginous. Female spathellae inconspicuous or absent. Female spikelet sessile or pedicel simple, obovate or undifferentiated, apex undifferentiated, 3.3–8 mm long, with 1–10 flowers, with 0–2 sterile bracts. Female bracts shorter than flowers or as tall as flowers or taller than flowers, erect, 2–5.5 mm long, ovate or orbicular, rounded or obtuse, coriaceous, apical margin membranous, same as body of bract, awn minute or absent. Female flower 1.8–3 mm long, regular, without a fleshy pedicel, six tepals. Female tepals chartaceous or cartilaginous, keels of lateral sepals sparsely villous or keels of lateral sepals densely villous, midrib raised, apices rounded or acute or acuminate, inner and outer whorls the same length or inner whorl shorter than outer. Female outer lateral tepals conduplicate, 1.8–3 mm long. Female odd outer tepal ovate, 1.8–3 mm long. Female inner tepals ovate, 1.8–2.6 mm long. Staminodes absent. Styles feathery, 2. Style bases fused to form a pillar. Ovary with 1 locule, dehiscent. Fruit: seed (1.88–)2.1(–2.4) mm long, (1.52–)1.66(–1.92) mm in diameter, shape in side view elliptical, shape in diameter elliptical in cross section or triangular in cross section, silvery or brown (mottled), pitted.