thyrse = a type of inflorescence; -fer = in Latin composition meaning carrying. Thus "thyrsifer" is the restio carrying a thyrse.
WCM Protologue Reference:
(Rottb.) Pers., Syn. Pl. 2: 607 (1807)
Vegetative parts: plants clumped or tufted (Plants forming large clumps), 1–2 m tall, basal diameter 0.3–5 m, crown diameter 0.4–5 m, with rhizomes. Rhizome looping up, with clusters of culms on the uploops, 3–5 mm in diam., culms 20–40 mm apart. Fertile culms unbranched, round (not compressed), solid or with a small central cavity, smooth, green, 0.4–2 m tall, diameter at base 2.5–4 mm, diameter at apex 1.5–3.2 mm. Clusters of sterile branches at the nodes of the fertile branches absent. Sheaths more than 1 per culm, dropping off, with an abscission line present, loosely convoluted, 35–75 mm long, margins entire, tan to light-brown with sparse or dense brown speckles and lighter coloured margins, or, upper 1/3 in colour and texture similar to the lower 2/3, apical margins narrowly membranous, hyaline shoulders absent, apex, excluding the membranous lobes, acute. Sheath-mucro absent or penicellate, straight and erect, 0.5–1.3 mm long. Males: male inflorescence with 50–100 spikelets or 101–500 spikelets or 501 and more spikelets, paniculate, 40–150 mm long, 15–30 mm wide. Male inflorescence spathes caducous, as tall as spikelets, chartaceous. Male spathellae conspicuous, 7–20 mm long. Male flowers in spikelets. Male spikelets erect on stiff pedicels or sessile, ovate, apex undifferentiated, 3–4 mm, 2.5–3.5 mm, with 4–6 flowers, pedicels shorter than the spikelets, terete or angular. Male bracts shorter than flowers or as tall as flowers or taller than flowers, 1.5–4 mm long, ovate, rounded or acuminate, chartaceous, bract upper margin like body of bract, bract awn less than half as long as the bract body, lower bracts acuminate, upper rounded with apiculus. Male flower 2–3 mm long. Male tepals sepals and petals the same rigidity, chartaceous, ovate, inner tepals longer than outer tepals. Male outer lateral tepals keeled or winged, glabrous (outer tepals half as long as inner tepals). Anthers 1.2–1.5 mm long, included in the flowers. Pistillode absent. Females: female inflorescence interrupted or linear, 50–120 mm long, 15–30 mm wide, with 51–100 spikelets or 101–500 spikelets. Female spathes longer than the spikelets, not obscuring spikelet or obscuring spikelet (partially obscuring), caducous, chartaceous. Female spathellae conspicuous, 6–12 mm long. Female spikelet pedicel much branched, ovate or undifferentiated, apex acute, 3.5–5 mm long, with 3–5 flowers, with 0 sterile bracts. Female bracts shorter than flowers, erect, 2–4.5 mm long, ovate, rounded or acuminate, chartaceous, apical margin like rest of bract, same as body of bract, awn less than half as long as the bract body. Female flower 2.5–4.5 mm long, without a fleshy pedicel, six tepals. Female tepals chartaceous, glabrous and smooth, at least as tall as nut, wrapped around it and obscuring the surface, midrib raised, margins entire, apices acute or acuminate, inner and outer whorls the same length. Female outer lateral tepals like other tepals or conduplicate, 2.3–4 mm long. Female odd outer tepal oblong or elliptical, 2.3–4 mm long. Female inner tepals oblong, 2.3–4 mm long. Staminodes absent. Styles feathery, white, 3. Style bases seated on a stylopodium (which is swollen and extends down the side of the ovary, resulting in a three-winged ovary). Ovary with 1 locule, indehiscent. Fruit: indehiscent fruits with a softer ovary wall. Perianth presence on fruits persistent, papery to leathery, not winged. Nut apex smooth, without a distinct cap, wall smooth, 1.2–2.5 mm long, 1–1.5 mm diam., shape in side view elliptical, shape in top view triangular in cross section, black, mode of seed release for nutted plants unknown. Elaiosome absent.