Lachnagrostis preissii

Lachnagrostis preissii Nees. (1846).

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

Type of Basionym or
Protologue Information
: IT: J.A.L. Preiss 1896, Oct 1840, Australia: Western Australia: in regionibus
interioribus Australiae meridionali-occidentalis (BM, K, L).

Recent synonyms:
Agrostis preissii (Nees) Vickery.

Key references
(books and floras):
[1952] C.A.Gardner, Flora of Western
1 Gramineae (154), [2005] K.Mallet (ed.),
Flora of Australia
44B: Poaceae 3, [2009] A.Wilson (ed.). Flora of Australia,
Vol 44A. Poaceae 2 (187).

Habit. Annual.
Culms erect or geniculately ascending, 12–45 cm tall, 4 -noded. Leaf-sheaths
smooth, glabrous on surface. Ligule an eciliate membrane, 3–6 mm long, acute.
Leaf-blades filiform, conduplicate, 2–12 cm long, 0.5 mm wide. Leaf-blade
surface smooth.

Inflorescence compound, a panicle. Panicle linear, loose, 4–15 cm long.

Spikelets pedicelled. Fertile spikelets 1-flowered, comprising 1 fertile
floret(s), with a barren rachilla extension, elliptic, laterally compressed,
3–4.5 mm long.

Glumes. Glumes
similar, firmer than fertile lemma, shiny. Lower glume lanceolate, membranous,
much thinner on margins, keeled, 1-keeled, 1 -nerved. Upper glume lanceolate,
3.6–4.2 mm long, membranous, keeled, 1-keeled, 1 -nerved.

Fertile lemma 4 mm long, without keel, 5 -nerved. Lemma surface indumented.
Lemma apex dentate, awned, 1 -awned. Median (principal) awn dorsal, 8–9 mm long
overall, with a twisted column. Palea present. Palea apex dentate. Lodicules
present. Anthers 3.

: Australasia.

: Western Australia.

: Irwin, Eyre, Avon,

AVH 2011

Notes. Endemic. Restricted
to W.A.


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