Rytidosperma geniculatum

Rytidosperma geniculatum (J.M.Black)
Connor & Edgar. New Zealand J. Bot. 17: 323 (1979).

Classification. (GPWG 2001) : Subfamily Danthonioideae. Tribe Danthonieae.

Basionym and/or
Replacement Name:
J.M. Black, Trans. & Proc. Roy. Soc. South Australia 53:
261 (1929).

Type of Basionym or
Protologue Information
: LT: J.M. Black 1, 23 Nov 1917, Australia:
South Australia: Keith (AD; IK, MEL, NSW-1377, NSW-1378). LT designated by
Vickery, Contr. New South Wales NAtl. Herb. 2: 279 (1956).

Recent synonyms:
Notodanthonia geniculata (J.M.Black) Zotov, Austrodanthonia
(J.M. Black) H.P. Linder.

Key references
(books and floras):
[2002] D.Sharp & B.K.Simon, AusGrass, Grasses of
, [2006] J.Jessop, G.R.M.Dashorst, F.M.James, Grasses of South

[2005] K.Mallet (ed.), Flora of Australia 44B: Poaceae 3 (Fig.
10, G-H), [2006] J.Jessop, G.R.M.Dashorst, F.M.James, Grasses of South
 (292, fig. 227).

Derivation: L. genus,
knee; -ulus, diminutive. -ata, possessing. Plants with bent culms
or awns.

Perennial. Culms erect or geniculately ascending, stature slender to delicate,
8–45 cm tall, 3 -noded. Leaf-sheaths smooth. Ligule a fringe of hairs.
Leaf-blades filiform, involute, 7–20 cm long, 1 mm wide. Leaf-blade surface

Inflorescence solid, a panicle. Panicle ovate, 1–5 cm long.

Spikelets pedicelled. Fertile spikelets many flowered, with at least 2 fertile
florets (4–6), comprising 4–6 fertile floret(s), with diminished florets at the
apex, cuneate, laterally compressed, 6.7–10 mm long.

Glumes. Glumes
similar, thinner than fertile lemma. Lower glume ovate, membranous, without
keels, 7 -nerved. Upper glume oblong, 5–8 mm long, membranous, without keels, 7

Fertile lemma 1.5–2.4 mm long, without keel, 9 -nerved. Lemma surface
indumented. Lemma apex lobed, awned, 1 -awned or 3 -awned. Median (principal)
awn from a sinus, 4–6 mm long overall, with a straight or slightly twisted
column. Lateral lemma awns absent or present. Lodicules present. Anthers 3.
Grain 1.2–1.4 mm long.

: Australasia.

: South Australia, Victoria, Tasmania.

South Australia:
Gairdner-Torrens Basin, Flinders Ranges, Eyre Peninsula, Murray, Southern
Lofty, Kangaroo Island, South-eastern. Victoria: East Gippsland,
Gippsland Plain, Grampians, Lowan Mallee, Midlands, Murray Mallee, Otway Plain,
Otway Range, Wilsons Promontory, Volcanic Plain, Wannon, Wimmera. Tasmania:
North East, Midlands, East Coast.

Restricted to southern Australia, from Eyre Peninsula to Gippsland and
Tasmania, altitude 10–600 m, widespread on sandy soils, associated with open
woodland, sunny grassland or heathland. Flowers Oct.


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