Lachnagrostis lacunarum, (D.I.Morris)S.W.L.Jacobs. as 'lacunis' Telopea
9:446(2001). Classification. (GPWG 2001) : Subfamily Pooideae.
Tribe Poeae.
Basionym and/or
Replacement Name: Agrostis lacunis
D.I. Morris, Muelleria 7(2): 149, 151–153, f. 4, 5a (1989).
Type of Basionym or
Protologue Information: Australia: Tasmania: Twisted Tarn, Mt Field
National Park, 1110 m, aquatic, shallow water with mud bottom; 1 Mar 1983, A.M.
Buchanan 1187 (HT: HO-93290; IT: AD, CANB, CHR, MEL, NSW).
Key references
(books and floras): [2002] D.Sharp & B.K.Simon, AusGrass, Grasses of
Australia,
[2009] A.Wilson (ed.). Flora of Australia, Vol 44A. Poaceae 2
(181).
Habit. Annual
or perennial. Culms erect or geniculately ascending, 20–40 cm tall. Ligule an
eciliate membrane, 3–6 mm long, acute. Leaf-blades linear, flat, 10–20 cm long,
1.5–2.5 mm wide. Leaf-blade surface scaberulous.
Inflorescence.
Inflorescence compound, a panicle. Panicle pyramidal, 6–12 cm long, 4–7 cm wide.
Spikelets.
Spikelets pedicelled. Fertile spikelets 1-flowered, comprising 1 fertile
floret(s), with a barren rachilla extension, lanceolate, laterally compressed,
(2.5–)2.75–4 mm long.
Glumes. Glumes
similar, firmer than fertile lemma. Lower glume lanceolate or elliptic,
membranous, keeled, 1-keeled, 1 -nerved. Upper glume lanceolate or elliptic,
2.75–4 mm long, membranous, keeled, 1-keeled, 1 -nerved. Upper glume surface
scabrous.
Florets.
Fertile lemma (1.5–)2–2.5 mm long, without keel, 5 -nerved. Lemma surface
indumented. Lemma apex dentate, awned. Median (principal) awn dorsal, 1.5–3.25
mm long overall, with a straight or slightly twisted column. Column 1.5 mm
long. Palea present, 2 -nerved. Lodicules present. Anthers 3.
Continental
Distribution: Australasia.
Australian
Distribution: Tasmania.
Tasmania:
Central Highlands, Mt Field.
Notes. Endemic. Restricted
to the Central Highlands and Mt Field, Tas. at
altitudes of 850–1250 m. At the edge of tarns and lakes in highland areas.
