Pacific Island Ecosystems at Risk (PIER)

  [   PIER species lists  ]   [   PIER home  ]

Pennisetum petiolare
(Hochst.) Chiov., Poaceae
No images for this taxon


Present on Pacific Islands?  no

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 7 (Go to the risk assessment)

Other Latin names:  Beckeropsis petiolaris (Hochst.) Fig. & De Not.; Cenchrus petiolaris (Hochst.) Morrone; Gymnotrix petiolaris Hochst.

Common name(s): [more details]

English: petioled fountaingrass

Habit:  grass

Description:  "Annual. Culms erect; 45-120 cm long; compressible; with prop roots. Ligule a fringe of hairs. Leaf-blade base broadly rounded, or cordate; with a false petiole; petiole 2-12 cm long. Leaf-blades 10-25 cm long; 8-25 mm wide; flaccid. Leaf-blade surface glabrous, or puberulous. Leaf-blade margins scaberulous.  Synflorescence compound; scanty. Inflorescence a panicle; terminal and axillary.  Panicle spiciform; linear; 1.5-3 cm long. Primary panicle branches accrescent to a central axis; with lateral stumps on axis. Panicle axis scaberulous; glabrous.  Spikelets subtended by an involucre. Fertile spikelets sessile; 1 in the cluster.  Involucre composed of bristles; base obtuse. Involucral bristles deciduous with the fertile spikelets; in one whorl; 1 in principal whorl; 10-20 mm long; terete; flexible; glabrous. Fertile spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; acute; 2-3 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus base truncate.  Glumes similar; shorter than spikelet; thinner than fertile lemma. Lower glume oblong; 0.1-0.5 mm long; 1 length of upper glume; 0.05-0.15 length of spikelet; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume oblong; 0.1-0.5 mm long; 0.05-0.15 length of spikelet; hyaline; without keels; 0 -veined. Upper glume primary vein absent. Upper glume lateral veins absent. Upper glume apex emarginate.  Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 1 length of spikelet; membranous; 5 -veined; smooth, or scaberulous; acute. Fertile lemma elliptic; 2-3 mm long; cartilaginous; without keel; 5 -veined. Lemma surface smooth, or scaberulous. Lemma margins flat. Lemma apex acute. Palea cartilaginous" (GrassBase).

Habitat/ecology:  (no habitat/ecology info known by PIER)

Propagation:  Seed

Native range:  Northeast tropical Africa (GrassBase).

Presence:

Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
United States (continental except west coast)
United States (other states)
United States (other states) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

  [   PIER species lists  ]   [   PIER home  ]

This page was created on 26 NOV 2008 and was last updated on 6 DEC 2008.