Triodia biflora

Triodia biflora M.
Lazarides. Austral. Syst. Bot.
10: 412 (1997).

Classification. (GPWG 2001) : Subfamily
Chloridoideae. Triodeae.

Type of Basionym or
Protologue Information
: Western Australia: Norhtern Province, Hamersley
Range, Knox Gorge, Karijini National Park, Lat. 22º23' S, Long. 11 18' E,
22.vii.1992., B.Rice 4445 (HT: CANB).

Key references
(books and floras):
[2002] D.Sharp & B.K.Simon, AusGrass, Grasses of

[2005] K.Mallet (ed.), Flora of Australia 44B: Poaceae 3 (Fig.

Habit. Perennial.
Stolons absent or present. Culms 30–60 cm tall. Leaf-sheaths 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.

Inflorescence compound, a panicle. Panicle elliptic, 20–25 cm long, 5–7 cm

Spikelets pedicelled. Fertile spikelets many flowered, with at least 2 fertile
florets (2), comprising 2 fertile floret(s), with diminished florets at the
apex, elliptic, laterally compressed, 3.3–4 mm long.

Glumes similar, thinner than fertile lemma. Lower glume elliptic or oblong,
chartaceous or scarious, without keels, 3 -nerved. Lower glume surface
glabrous. Lower glume apex muticous. Upper glume elliptic or oblong, 2.5–3.5 mm
long, chartaceous or scarious, without keels, 3 -nerved. Upper glume surface
asperulous, glabrous. Upper glume apex entire.

Fertile lemma 3–3.8 mm long, without keel, 3–5 -nerved. Lemma surface glabrous.
Lemma apex entire (or minutely 3-dentate) or dentate or lobed, muticous. Palea
apex entire or dentate. Lodicules present. Anthers 3.

: Australasia.

: Western Australia.

Western Australia:

Known from only 2 collections.

 Diagnostic characters include the spikelet of
two sessile closely appressed similar, adjacent fertile florets and a third
vestigial floret terminal on a long, filiform internode of the rachilla. Also
the glumes are scarious and slightly shorter than the florets; the lemmas
bitextured, 3-nerved, with thickly 3–5-nerved apex; the palea is partly
scaberulous, with winged keels; the callus minute and thickened; and the
foliage highly resinous.

only from the Hamersley Ra., W.A. Steep rocky walls and ledges of gorges;
flowers July-Aug.


AVH 2011

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith