Cenchrus americanus*

Cenchrus americanus* (L.) Morrone. Ann.
106:127 (2010).

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

Basionym and/or
Replacement Name:
Panicum americanum L., Sp. Pl. 1: 56 (1753).

Type of Basionym or
Protologue Information
: LT: Hermann, Fl. Zeyl. 44, Sri Lanka (BM).
LT designated (as holotype) by Rauschert, Feddes Repert. 83(9–10): 662

Recent synonyms:  P. typhoides, P. glaucum L., Sp. Pl. 1: 56 (1753).

Key references
(books and floras):
[1810]. R.Brown, Prodromus (195), [1952]
C.A.Gardner, Flora of Western Australia 1 Gramineae (278 as P.
), [2002] D.Sharp & B.K.Simon, AusGrass, Grasses of
as Pennisetum glaucum, [2008] S.W.L.Jacobs, R.D.B.Walley & D.J.B.Wheeler, Grasses
of New South Wales
(333) as Pennisetum glaucum.

[2008] S.W.L.Jacobs, R.D.B.Whalley & D.J.B.Wheeler, Grasses of New South
, 4th edn (333) as Pennisetum glaucum.

Habit. Annual.
Rhizomes absent. Stolons absent. Culms erect, stature robust to moderate,
50–300 cm tall. Mid-culm internodes solid or spongy. Mid-culm nodes bearded.
Leaf-sheath auricles absent. Ligule a fringed membrane or a fringe of hairs,
2–5 mm long. Leaf-blades linear, 15–100 cm long, 7–70 mm wide.

Inflorescence solid, a panicle. Panicle linear or elliptic, 4–200 cm long,
0.8–5.5 cm wide.

Spikelets pedicelled, 1–9 in the cluster. Involucre composed of bristles.
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, obovate, terete or dorsally compressed, 3–6 mm

Glumes. Glumes
thinner than fertile lemma. Upper glume oblong, 0.5–2 mm long, membranous,
without keels, 0–3 -nerved. Florets. Basal sterile florets 1, male or
barren, with palea or without significant palea. Lemma of lower sterile floret
50–75 % of length of spikelet, chartaceous, 5–7 -nerved, muticous or mucronate.

Fertile lemma 1.4–4 mm
long, without keel, 5–7(–9) -nerved. Lodicules absent or vestigial. Anthers 3.
Grain 2–5.5 mm long.

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

: Western Australia, Northern Territory, Queensland, New South

Western Australia:
Drummond. Northern Territory: Darwin & Gulf. Queensland:
Burke, Burnett, Cook, Leichhardt, Moreton, Wide Bay. New South Wales:
North Coast, Central Coast, Northern Tablelands, North-Western Slopes, South-Western

Introduced. A crop species that occasionally escapes cultivation and persists
in mesic areas. Flowers mostly Mar.-July but sporadically throughout the year.


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