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Trisetum flavescens*

Trisetum flavescens* (L.) Beauv. Ess. Agrostogr. 88, 180, t. 18, fig. 1 (1812).

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

Basionym and/or
Replacement Name:
 Avena
flavescens
L., Pl. Sp. 80 (1753).

Type of Basionym or
Protologue Information
: LT: Herb. A. Van Royen no. 913.7–458, (L).
LT designated by Cope in Cafferty et al., Taxon 49(2): 247 (2000).

Key references
(books and floras):
[2002] D.Sharp & B.K.Simon, AusGrass, Grasses of
Australia
, [2008] S.W.L.Jacobs, R.D.B.Walley & D.J.B.Wheeler, Grasses
of New South Wales
(390), [2009] A.Wilson (ed.). Flora of Australia,
Vol 44A. Poaceae 2 (161).

Illustrations:
[2008] S.W.L.Jacobs, R.D.B.Whalley & D.J.B.Wheeler, Grasses of New South
Wales
, 4th edn (390).

Habit.
Perennial. Culms erect or geniculately ascending, 20–80(–100) cm tall, 2–5
-noded. Ligule an eciliate membrane, 0.3–1.1 mm long. Leaf-blades 3.5–18 cm
long, 1.5–5 mm wide. Leaf-blade surface scabrous, glabrous or indumented.

Inflorescence.
Inflorescence solid, a panicle. Panicle elliptic, 6.5–15 cm long, 1.5–7 cm
wide.

Spikelets.
Spikelets pedicelled. Fertile spikelets many flowered, with at least 2 fertile
florets (2–4), comprising 2–4 fertile floret(s), with diminished florets at the
apex, oblong or cuneate, laterally compressed, 5–7(–8) mm long.

Glumes. Glumes
dissimilar, thinner than fertile lemma, shiny. Lower glume lanceolate,
membranous, keeled, 1-keeled, 1–3 -nerved. Upper glume elliptic, 4.3–6.5 mm
long, membranous, keeled, 1-keeled, 3 -nerved.

Florets.
Fertile lemma 4.4–6.3 mm long, keeled, 5 -nerved. Lemma apex entire or dentate,
awned, 1 -awned. Median (principal) awn dorsal, 5–9 mm long overall, with a
twisted column. Anthers 3.

Continental
Distribution
: Europe, Africa, Temperate Asia, Tropical Asia, Australasia,
North America, and South America.

Australian
Distribution
: New South Wales.

New South Wales:
Northern Tablelands, Central Tablelands, Southern Tablelands.

Notes.
Introduced. Native to Europe and the Mediterranean. Roadsides and grasslands.
Flowers Nov.

 

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