Cenchrus setigerus*

Cenchrus setigerus* Vahl. Ann. Bot. 106: 129 (2010).

Classification. (GPWG 2001) : Subfamily
Panicoideae. Paniceae.

Basionym and/or
Replacement Name:
Vahl, Enum. Pl. 2: 395 (1805).

Type of Basionym or
Protologue Information
: Saudi Arabia:, Forsskal s.n. (HT: C).

Recent synonyms:
Pennisetum setigerum.

Key references
(books and floras):
[1952] C.A.Gardner, Flora of Western Australia 1
Gramineae (286), [1981] M.Lazarides in
J.Jessop (ed)., Flora of Central Australia (480),
[2002] D.Sharp & B.K.Simon, AusGrass, Grasses of Australia as Pennisetum setigerum, [2006]
J.Jessop, G.R.M.Dashorst, F.M.James, Grasses of South Australia (436), [2008] S.W.L.Jacobs, R.D.B.Walley & D.J.B.Wheeler, Grasses
of New South Wales

[1952] C.A.Gardner, Flora of Western Australia 1 Gramineae (285,
Pl.82), [2006] J.Jessop, G.R.M.Dashorst, F.M.James, Grasses
of South Australia
 (436, fig. 367), [2008] S.W.L.Jacobs, R.D.B.Whalley & D.J.B.Wheeler, Grasses
of New South Wales
, 4th edn (181).

Habit. Perennial. Rhizomes present. Stolons absent. Culms geniculately
ascending, 5–100 cm tall. Ligule a fringe of hairs, 0.6–1.2 mm long.
Leaf-blades 2–30 cm long, 2–7 mm wide. Leaf-blade surface glabrous or

Inflorescence solid, of only a few spikelets (spicate). Panicle linear, 2–12 cm
long. Racemes 2–12 cm long.

Spikelets sessile, 1–3 in the cluster. Involucre composed of bristles, connate
into a cup below. Fertile spikelets 2-flowered, the lower floret barren (rarely
male), the upper fertile, comprising 1 basal sterile florets, comprising 1
fertile floret(s), without rachilla extension, ovate, dorsally compressed,
3–5.3 mm long.

Glumes. Glumes
thinner than fertile lemma. Lower glume ovate, hyaline, without keels, 1
-nerved. Lower glume surface indumented. Upper glume ovate, 1.5–2.9 mm long,
hyaline, without keels, 1 -nerved. Upper glume surface scabrous, indumented. Florets.
Basal sterile florets 1, barren, with palea. Lemma of lower sterile floret 100
% of length of spikelet, hyaline or membranous, 5 -nerved, mucronate.

Fertile lemma 2.8–5 mm
long, without keel, 5–7 -nerved. Lemma apex mucronate. Lodicules absent or
vestigial. Anthers 3. Grain 1.5 mm long.

: Africa, Temperate Asia, Tropical Asia, Australasia, Pacific,
and South America.

: Western Australia, Northern Territory, South Australia,
Queensland, New South Wales.

Western Australia:
Gardner, Fitzgerald. Canning, Fortescue, Carnarvon, Austin. Irwin. Northern
: Darwin & Gulf, Victoria River, Central Australia North,
Central Australia South. South Australia: Lake Eyre. Queensland:
Burke, Cook, Leichhardt, Maranoa, Mitchell, North Kennedy, Warrego. New
South Wales
: North Coast, Central Coast, Northern Tablelands.

This species has frequently been confused with C. biflorus, from which
it differs in having antrorsely scabrid bristles.

Introduced. In
tropical and subtropical sub-humid woodlands, temperate sub-humid woodlands,
acacia shrublands, and arid hummock grasslands. Flowers Jan.-July.


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