Derivation
Triodia R.Br., Prodr. 182 (1810); from the Greek treis (three) and odous (tooth), referring to the 3-toothed or 3-lobed lemmas.

biflora- from the Latin bis (twice) and flos (flower). Florets two per spikelet.

Published in
Austral. Syst. Bot. 10: 412 (1997).

Habit
Perennial, tufted. Stolons absent or present. Culms 30–60 cm tall. Mid-culm internodes striate. Leaf-sheaths longer than adjacent culm internode, resinous, glabrous on surface. Leaf-sheath auricles absent. Ligule a fringe of hairs, 1.5–2 mm long. Leaf-blades straight, conduplicate or involute, 25–30 cm long, 0.5–1.2 mm wide, coriaceous, rigid, resinous, aromatic. Leaf-blade surface grooved on either side of midline. Leaf-blade margins scabrous. Leaf-blade apex pungent.

Inflorescence
Inflorescence compound, a panicle. Panicle open, elliptic, 20–25 cm long, 5–7 cm wide. Primary panicle branches simple or sparsely divided, 8–10 cm long. Panicle axis and branches angular, bearing approximate spikelets or distant spikelets, bearded in axils.

Spikelets
Spikelets solitary. Pedicels linear, angular, 1.5–2(–5) mm long. Fertile spikelets at least 3-flowered, comprising 2 fertile florets, with diminished florets at the apex, elliptic, laterally compressed, 3.3–4 mm long, 2.3 mm wide, breaking up at maturity. Spikelets disarticulating below each fertile floret. Spikelet callus bearded, base obtuse. Rhachilla internodes suppressed between florets. Floret callus obtuse.

Glumes
Glumes persistent, similar, thinner than fertile lemma. Lower glume elliptic or oblong, 2.5–3.5 mm long, equalling upper glume, chartaceous or scarious, light brown, 3-nerved. Lower glume surface asperulous, glabrous. Lower glume apex entire, truncate or obtuse, muticous. Upper glume elliptic or oblong, 2.5–3.5 mm long, chartaceous or scarious, light brown, 3-nerved. Upper glume surface asperulous, glabrous. Upper glume apex entire, truncate or obtuse.

Florets
Fertile lemma oblong, 3–3.8 mm long, scarious or cartilaginous or coriaceous, much thinner above, 3–5-nerved. Lemma surface scaberulous, rough above, glabrous. Lemma apex entire (or minutely 3-dentate) or dentate or lobed, 0–3-fid, acute, muticous. Palea elliptic, cartilaginous or coriaceous. Palea keels narrowly winged, scaberulous, adorned above, with 50% of their length adorned. Palea surface scaberulous. Palea apex entire or dentate, 2-fid, obtuse. Rhachilla extension 1.3–2 mm long. Apical sterile florets 1, orbicular. Lodicules 2, oblong, 0.3 mm long, fleshy, truncate. Anthers 3, 2 mm long. Grain with adherent pericarp.

Continental Distribution:
Australasia.

Australian Distribution:
Western Australia: Fortescue.

Classification. (GPWG 2001):
Chloridoideae: Triodieae

Notes

Native. Steep rocky walls and ledges of gorges; flowers July–Aug.
Known from only 2 collections.