duo (L.) = two, + stylus (L.) = styles; referring to the two styles of the species.
WCM Protologue Reference:
H.P.Linder & C.R.Hardy, Bothalia 40: 17 (2010)
Vegetative parts: plants clumped or tufted or mat-Forming (consisting of several to many small tufts, interconnected by a spreading rhizome), 0.3-0.5 m tall, basal diameter 0.05-1 m, crown diameter 0.05-1 m, compact, without spreading rhizomes or stolons or with rhizomes. Rhizome very short with culms aggregated at base or spreading, unbranched or sparsely branched, culms evenly spaced, 1.5-3 mm in diam., culms 0-5 mm apart. Fertile culms unbranched, finely warty, olivaceous, 0.3-0.5 m tall, diameter at base 0.6-1.4 mm, diameter at apex 0.5-1.2 mm. Sheaths loosely convoluted, 9-20 mm long (persistent portion 9-10 mm long, whole sheath 15-20 mm long), upper deciduous portion brown, lower persistent portion olivaceous turning drak brown, upper 1/3 in colour and texture abruptly different from the base, and soon decaying, apical margins broadly membranous, hyaline shoulders small, rounded or tall, acute, hyaline shoulder 0.3 of sheath body length, apex, excluding the membranous lobes, acute or truncate (persistent portion truncate). Sheath-mucro awl- or needleshaped, straight and erect, 4-5 mm long, remarkably similar to the sheaths of Willdenowia. Males: male inflorescence with 2-5 spikelets or 6-10 spikelets, racemose or paniculate, 20-100 mm long, 8-15 mm wide. Male inflorescence spathes persistent (also with apices caducuous), shorter than spikelets, coriaceous, apical half dropping off soon, like on sheaths. Male flowers in spikelets. Male spikelets erect on stiff pedicels or sessile, elliptical or obovate, apex rounded, 6-14 mm, 3-6 mm, with 20-40 flowers, pedicels absent ie spikelets sessile. Male bracts shorter than flowers, 3-3.5 mm long, oblong or obovate, rounded or obtuse, cartilaginous, bract upper margin like body of bract, bract awn minute or absent, upper margins darker than the body, with a tiny mucro. Male flower 3.5-4 mm long. Male tepals sepals more rigid than petals, cartilaginous, petals chartaceous, linear or oblong, inner and outer tepals the same length. Male outer lateral tepals keeled or winged (widening towards the apex, so that the flowers are somewhat obovate in shape), glabrous. Anthers 1-2.2 mm long, exserted from the flowers. Pistillode present. Females: female inflorescence interrupted or linear, 20-110 mm long, 6-12 mm wide, with 2-5 spikelets. Female spathes insignificant or shorter than the spikelets, persistent, coriaceous. Female spikelet sessile, oblong or ovate, apex rounded or obtuse, 7-15 mm long, with 6-30 flowers, with 3-6 sterile bracts. Female bracts as tall as flowers, 4-5 mm long, ovate, obtuse or acute, bony, apical margin like rest of bract, same as body of bract, awn minute or absent. Female flower 3.5-4 mm long, without a fleshy pedicel. Female tepals cartilaginous, glabrous and smooth, midrib flush with the tepal body, apices acute, inner and outer whorls the same length or inner whorl shorter than outer. Female outer lateral tepals conduplicate, hidden by bracts, or bracts are shorter than flowers, 3.5-4 mm long. Female odd outer tepal oblong or ovate, 3-4 mm long. Female inner tepals linear, 3-4 mm long. Styles feathery, sheaths with a truncate dehiscence; old spikelets black; similar to [I]C. monostylos[N], but with acute bracts., 2. Style bases free. Ovary with 1 locule, indehiscent. Fruit: indehiscent fruits with a softer ovary wall. Perianth presence on fruits persistent, winged. Shape of winged dispersal unit oblong, narrower than long. Nut apex smooth, without a distinct cap, wall smooth, 1.64-1.64 mm long, 1.12-1.12 mm diam., shape in side view obovate, shape in top view round in cross section or elliptical in cross section, brown. Elaiosome absent.