Muir, J., a physician at Riversdale, who made a comprehensive survey of the vegetation of the Riversdale area in 1929, in addition to other researches in natural history. He collected many new species in this area.
WCM Protologue Reference:
Pillans, Trans. Roy. Soc. South Africa 16: 366 (1928)
Vegetative parts: plants tufted, 0.8–1.2 m tall, basal diameter 0.2–0.4 m, crown diameter 0.6–0.8 m, compact, without spreading rhizomes or stolons. Fertile culms unbranched, smooth, olivaceous, 0.8–1.2 m tall, diameter at base 0.8–1.8 mm, diameter at apex 0.6–1 mm. Clusters of sterile branches at the nodes of the fertile branches present (rarely) or absent. Sterile branches present while flowering. Sheaths closely convoluted, 30–40 mm long, yellow brown with dark margins, apical margins narrowly membranous, hyaline shoulders absent, apex, excluding the membranous lobes, acute. Sheath-mucro penicellate, straight and erect, 1–3 mm long. Sterile branch leaf-sheath 2–3 mm long, hyaline shoulder 1–3 mm long, lacerated, leaf-blade 5.5–7.5 mm long; leaf blade 0.5 mm wide. Males: male inflorescence with 11–20 spikelets or 21–50 spikelets, paniculate, 60–170 mm long, 30–50 mm wide. Male inflorescence spathes persistent, upper margins lacerated and largely decayed at anthesis, shorter than spikelets, chartaceous. Male flowers in spikelets. Male spikelets pendulous on flexible pedicels, oblong, apex rounded, 6–14 mm, 3–5 mm, with 14–24 flowers, pedicels shorter than the spikelets, flattened. Male bracts taller than flowers, 3–5 mm long, oblong, acute, hyaline (margins, narrow to wide) or cartilaginous, bract upper margin like body of bract, bract awn minute or absent, brown with a very narrow hyaline margin. Male flower 3–3.5 mm long. Male tepals sepals more rigid than petals, cartilaginous, petals membranous, oblong (inner tepal oblong lanceolate, outer tepal linear oblong), inner and outer tepals the same length. Male outer lateral tepals keeled or winged, glabrous. Anthers 1.8–2 mm long, included in the flowers. Pistillode absent. Females: female inflorescence paniculate or racemose, 35–80 mm long, 10–30 mm wide, with 2–5 spikelets or 6–10 spikelets or 11–20 spikelets. Female spathes longer than the spikelets, not obscuring spikelet, persistent, chartaceous. Female spikelet pedicel simple or pedicel sparsely branching, oblong or elliptical or ovate, apex rounded, 15–30 mm long, with 16–40 flowers, with 0 sterile bracts. Female bracts taller than flowers, 6–12 mm long, oblong or ovate, acuminate, cartilaginous, apical margin like rest of bract, same as body of bract, awn minute or absent. Female flower 4.5–5.5 mm long, without a fleshy pedicel. Female tepals cartilaginous (sepals) or membranous (petals), glabrous and smooth, at least as tall as nut, wrapped around it and obscuring the surface, 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 keeled or winged, wings entire, wings lateral sepals decurrent, without grooves, wider than body, hidden by bracts, or bracts are shorter than flowers, 4.5–5.5 mm long. Female odd outer tepal oblong, 3.5–4.5 mm long. Female inner tepals ovate, 3.5–4.5 mm long. Staminodes absent. Styles plumose, white, 1. 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 0.94–1.38 mm long, 0.8–1 mm diam., shape in side view obovate, brown. Elaiosome absent.