Deyeuxia quadriseta

Deyeuxia quadriseta (Labill.) Benth. Fl. Austral. 7: 581 (1878).

Classification. (GPWG 2001) : Subfamily Pooideae. Tribe Poeae.

Basionym and/or
Replacement Name: Avena
quadriseta Labill., Nov. Holl. Pl. 1: 25, t. 32 (1805).

Type of Basionym or
Protologue Information: HT: Labillardière s.n., Australia: Tasmania (FI; IT: P).

Key references
(books and floras): [1810]. R.Brown, Prodromus (171 as Agrostis
quadriseta, Agrostis cylindrica, Agrostis lobata), [1878] G.Bentham, Flora
Australiensis 7 (581as Deyeuxia quadriseta, 582 as Deyeuxia
cylindrica), [1952] C.A.Gardner, Flora of Western Australia 1 Gramineae
(158), [2002] D.Sharp & B.K.Simon, AusGrass, Grasses of Australia,
[2002] J.Wheeler, N.Marchant & M.Lewington, Flora of the South West (411),
[2006] J.Jessop, G.R.M.Dashorst, F.M.James, Grasses of South Australia
(214), [2008] S.W.L.Jacobs, R.D.B.Walley & D.J.B.Wheeler, Grasses of New
South Wales (205), [2009] A.Wilson (ed.). Flora of Australia, Vol 44A. Poaceae 2
(194).

Illustrations:
[1952] C.A.Gardner, Flora of Western Australia
1 Gramineae (157, Pl. 47), [2006] J.Jessop, G.R.M.Dashorst, F.M.James, Grasses
of South Australia
(213, fig. 160), [1984]
N.T.Burbidge. rev. S.W.L.Jacobs, Australian Grasses (107), [2008] S.W.L.Jacobs, R.D.B.Whalley
& D.J.B.Wheeler, Grasses of New South Wales, 4th edn (205), [2009].
A.Wilson (ed.), Flora of Australia
44A: Poaceae 2 (196, Fig. 27; 213, Fig.29).

Habit.
Perennial. Culms 15–120 cm tall, 3–4 -noded. Lateral branches simple. Leaves
mostly basal. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane,
4–7 mm long, membranous, lacerate, obtuse. Leaf-blades linear, flat or
involute, 10–30 cm long, 2.5–7 mm wide.

Inflorescence.
Inflorescence solid, a panicle. Panicle linear or oblong, dense, 3–21 cm long.

Spikelets.
Spikelets pedicelled. Fertile spikelets 1-flowered, comprising 1 fertile
floret(s), without rachilla extension, lanceolate, laterally compressed, 3–6 mm
long.

Glumes. Glumes
similar, thinner than fertile lemma. Lower glume lanceolate, membranous,
keeled, 1-keeled, 1 -nerved. Upper glume lanceolate, membranous, keeled,
1-keeled, 1 -nerved.

Florets.
Fertile lemma 2–4 mm long, without keel, 5 -nerved. Lemma apex dentate, awned,
1 -awned. Median (principal) awn subapical or dorsal, 5–6 mm long overall, with
a twisted column. Palea apex dentate. Lodicules present. Anthers 3.

Continental
Distribution: Australasia.

Australian
Distribution: Western Australia, South Australia, New South Wales,
Victoria, Tasmania.

Western
Australia: Drummond, Dale, Menzies, Warren. South
Australia: Flinders Ranges, Eyre Peninsula, Murray,
Yorke Peninsula, Southern Lofty, Kangaroo
Island, South-eastern. New South Wales: Central
Coast, South Coast,
Northern Tablelands, Central Tablelands, Southern Tablelands, South-Western
Slopes, South-Western Plains. Victoria: East Gippsland, Eastern
Highlands, Gippsland Highlands, Gippsland Plain, Grampians, Lowan Mallee,
Midlands, Otway Plain, Otway Range, Wilsons Promontory, Riverina, Snowfields,
Volcanic Plain, Wannon, Wimmera. Tasmania: King Island, Furneaux Group,
North West, North East, West Coast, Central Highlands, Midlands, Ben Lomond,
East Coast, South West, Mt Field, Mt Wellington.