Rottboell, C.F., Danish botanist, student of Linnaeus, and director of the Copenhagen botanical garden, 1770–1797.
WCM Protologue Reference:
Kunth, Enum. Pl. 3: 394 (1841)
Vegetative parts: plants tufted, 0.15–0.45 m tall, basal diameter 0.05–0.1 m, crown diameter 0.05–0.1 m, compact, without spreading rhizomes or stolons. Fertile culms branching, round (not compressed), solid or with a small central cavity, roughly warty, green, 0.1–0.45 m tall, diameter at base 0.7–1.4 mm, diameter at apex 0.5–0.8 mm. Branch axil indumentum absent. Clusters of sterile branches at the nodes of the fertile branches absent. Sheaths more than 1 per culm, persistent, with no abscission line, closely convoluted, 5–17 mm long, margins entire, orange-brown to brown, sometimes with fine tan speckles, upper 1/3 in colour and texture similar to the lower 2/3, apical margins narrowly membranous, hyaline shoulders small, rounded, apex, excluding the membranous lobes, obtuse or truncate (obtuse to nearly truncate). Sheath-mucro penicellate, straight and erect, 0.6–2.6 mm long. Males: male inflorescence with 2–5 spikelets or 6–10 spikelets or 11–20 spikelets, racemose, 50–110 mm long, 2–3 mm wide. Male inflorescence spathes persistent, shorter than spikelets, cartilaginous. Male spathellae inconspicuous or absent. Male flowers in spikelets. Male spikelets erect on stiff pedicels or sessile, elliptical, apex acute or undifferentiated, 6–10 mm, 1–2 mm, with 2–4 flowers, pedicels absent ie spikelets sessile. Male bracts as tall as flowers (sometimes very slightly taller than flowers), 7–10 mm long, elliptical or ovate (narrowly ovate to almost elliptical), acute, margins entire, chartaceous, bract upper margin like body of bract, bract awn minute or absent. Male flower 4–8.5 mm long. Male tepals sepals and petals the same rigidity, chartaceous, linear or oblong or elliptical (outer oblong and often linear, inner elliptical), inner and outer tepals the same length. Male outer lateral tepals conduplicate, glabrous. Anthers 2.5–3.5 mm long, exserted from the flowers. Females: female inflorescence interrupted or linear (Single spikelets occur but are infrequent), 10–70 mm long, 1–2 mm wide, with 1 spikelet or 2–5 spikelets or 6–10 spikelets. Female spathes shorter than the spikelets, persistent, coriaceous or cartilaginous. Female spathellae inconspicuous or absent. Female spikelet sessile (spikelets closely adpressed to the culm), obovate or undifferentiated, apex undifferentiated, 4.5–7 mm long, with 1 flowers, with 2 sterile bracts (the outer one is as tall or slightly shorter than the flower and the inner one is very small (about half the length of the flower)). Female bracts shorter than flowers or as tall as flowers (sterile bracts are shorter than flower while fertile bract is as tall as flower), erect, 4–6 mm long, oblong or elliptical or ovate (the sterile bracts are oblong or elliptical while the fertile bract is ovate), rounded or obtuse or acute, coriaceous (though reletively thin), apical margin membranous, same as body of bract, margins entire, awn minute or absent. Female flower 4.5–6.5 mm long, without a fleshy pedicel, six tepals. Female tepals coriaceous or chartaceous, glabrous and smooth, midrib flush with the tepal body, margins entire, apices acute, inner whorl shorter than outer. Female outer lateral tepals like other tepals, 3–6 mm long. Female odd outer tepal ovate, 3–6 mm long. Female inner tepals ovate, 2–2.5 mm long. Staminodes absent. Styles feathery, white, 2. Style bases fused to form a pillar. Ovary with 2 locules, dehiscent. Fruit: seed (1.04–)1.31(–1.56) mm long, (0.68–)0.8(–0.92) mm in diameter, shape in side view elliptical, shape in diameter round in cross section, silvery or white, colliculate; funicular elaiosome absent.