Pacific Island Ecosystems at Risk (PIER)

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Panicum dichotomiflorum
Michx., Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: yang ye shu

English: bluegrass, fall panic grass, fall panicum, smooth witchgrass, western witchgrass

French: panic d'automne

Spanish: rapiente

Habit:  grass

Description:  "Geniculate or erect annuals 10-120 cm tall, usually glabrous; culms usually branched.  Ligule a ciliate membrane, 1-2 mm long; blades 10-50 cm long, 0.3-2 cm wide, flat, glabrous or sparsely pubescent.  Panicles 4-50 cm long, terminal and axillary; spikelets 2-.32 mm long, oblong-ovoid, acute, glabrous; first glume 0.6-1 mm long, 1/5 - 1/4 as long as spikelet, obtuse to truncate, 3-nerved, broadly clasping, second glume 7-nerved; first floret sterile or staminate, first lemma 7-nerved, first palea absent or as long as first lemma; second floret 1.7-2.1 mm long, acute, glossy, smooth; anthers 1.2-1.4 mm long"  (Wagner et al., 1999; p. 1568).

Description of Panicum dichotomiflorum from GrassBase

Habitat/ecology:  In Hawai‘i, "naturalized in mesic, disturbed areas, 120-1,220 m"  (Wagner et al., 1999; p. 1568).

Propagation:  Seed

Native range:  "Native to the Americas"  (Wagner et al., 1999; p. 1568).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1568)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1568)
Voucher cited: Lyman s.n. (BISH)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Central America
Central America (Pacific rim)
Panama (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Mexico
Mexico
Mexico (United Mexican States)   Hafliger, Ernst/Scholz, Hildemar (1980) (p. 80)
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Edgar, E./Connor, H. (2000) (p. 559)
"Weed of crops (especially maize, onions), and disturbed soil in orchards, gardens, roadsides, waste places and pasture".
South America (Pacific rim)
South America (Pacific rim)
Chile (Republic of)   Hafliger, Ernst/Scholz, Hildemar (1980) (p. 80)
South America (Pacific rim)
South America (Pacific rim)
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Taiwan
Taiwan Island
Taiwan Island   Hafliger, Ernst/Scholz, Hildemar (1980) (p. plate)


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

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This page was created on 5 FEB 2007 and was last updated on 9 MAY 2017.