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
Chile (continental)
Chile
Chile (Republic of)   Hafliger, Ernst/Scholz, Hildemar (1980) (p. 80)
China
China
China (People's Republic of)   Hafliger, Ernst/Scholz, Hildemar (1980) (p. 80)
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".
Panama
Panama
Panama (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
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.