Lachnagrostis billardieri

Lachnagrostis billardieri
(R.Br.)Trinius. (1820).
Classification. (GPWG 2001) : Subfamily Pooideae.
Tribe Poeae.

Basionym and/or
Replacement Name:
R. Br., Prodr. 171 (1810).

Type of Basionym or
Protologue Information
: HT: R. Brown 6218, 1802–1805, Australia: New South Wales: Port Jackson (BM). LT
designated by Vickery, Contr. New
South Wales
Herb 1: 101–119 (1941).

Recent synonyms:
Agrostis billardieri R.Br. var. billardieri, Agrostis
R.Br. var. tenuiseta D.I.Morris

Key references
(books and floras):
[1878] G.Bentham, Flora Australiensis 7 (580 as Deyeuxia
), [2002] D.Sharp & B.K.Simon, AusGrass, Grasses of
, [2006] J.Jessop, G.R.M.Dashorst, F.M.James, Grasses of South
(229), [2008] S.W.L.Jacobs, R.D.B.Walley & D.J.B.Wheeler, Grasses
of New South Wales
(289), [2009] A.Wilson (ed.). Flora of Australia,
Vol 44A. Poaceae 2 (177, 178 as subsp. billardieri, subsp. tenuiseta).

[2006] J.Jessop, G.R.M.Dashorst, F.M.James, Grasses of South Australia  (228, fig. 172 as subsp. billardieri),
[2008] S.W.L.Jacobs, R.D.B.Whalley & D.J.B.Wheeler, Grasses of New South
, 4th edn (289), [2009]. A.Wilson (ed.), Flora of Australia 44A:
Poaceae 2 (182, Fig.26 as subsp. billardieri).

Habit. Annual
or perennial. Rhizomes absent or present, short. Culms erect or geniculately
ascending, 25–75 cm tall, 3 -noded. Mid-culm nodes glabrous. Leaf-sheaths
antrorsely scabrous. Ligule an eciliate membrane, 3–12 mm long, abaxially
scaberulous, lacerate, obtuse or acute. Leaf-blades filiform or linear, flat or
conduplicate, 5–40(–50) cm long, 1–8 mm wide. Leaf-blade surface papillose.

Inflorescence compound, a panicle. Panicle pyramidal, 10–30 cm long, 5–30 cm

Spikelets pedicelled. Fertile spikelets 1-flowered, comprising 1 fertile
floret(s), with a barren rachilla extension, lanceolate, laterally compressed,
3–7 mm long.

Glumes. Glumes
similar, firmer than fertile lemma. Lower glume lanceolate, membranous, keeled,
1-keeled, 1 -nerved. Upper glume lanceolate, 4–7 mm long, membranous, keeled,
1-keeled, 1 -nerved. Upper glume surface scabrous.

Fertile lemma 2.5–4.5 mm long, without keel, 5 -nerved. Lemma surface glabrous.
Lemma apex dentate, muticous or awned, 1 -awned. Median (principal) awn
subapical or dorsal, 3–10 mm long overall, with a twisted column. Palea apex
dentate. Lodicules present. Anthers 3.

: Australasia.

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

South Australia:
Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty,
Kangaroo Island, South-eastern. New South Wales:
North Coast,
Central Coast,
South Coast. Victoria:
East Gippsland, Gippsland Plain, Lowan Mallee, Otway Plain, Wilsons Promontory, Wannon. Tasmania: North West, North East,
West Coast, East Coast, South West.



Infra-specific taxa: subsp. billardieri, subsp. tenuiseta.

Awn longer than 3.5
mm, exceeding the glumes                       L. billardieri subsp. billardieri     

Awn less than 2.0 mm, not or hardly exceeding the
glumes       L. billardieri subsp. tenuiseta

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