Pacific Island Ecosystems at Risk (PIER)

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Digitaria fuscescens
(C.Presl) Henr., Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Paspalum fuscescens J. Presl

Common name(s): [more details]

English: Y grass, yellow crab grass

Hawaiian: creeping kūkaepua‘a

Habit:  grass

Description:  "Annuals; culms ascending from a creeping base, 4-30 cm tall.  Sheaths glabrous, rarely with scattered hairs; ligule 0.5-2 mm long, truncate, erose; blades 1-5 cm long, 1-4 mm wide.  Inflorescence composed of 2 (3) digitate racemes, the racemes 1-7 cm long; spikelets ternate on a ribbon-like winged rachis, narrowly ovate-elliptic, 1.2-1.6 mm long; first glume a minute hyaline rim or absent, second glume as long as the spikelet, (3) 5-nerved, glabrous; first lemma as long as the spikelet, 7-nerved, glabrous; second lemma yellowish to brownish, as long as the spikelet, apex often bluish at anthesis, acuminate; palea enclosed within lemma, and similar in texture and color to it.  Caryopsis ellipsoid, pale brown"  (Wagner et al., 1999; p. 1531).

Description from GrassBase.

Habitat/ecology:  "Pioneer of sandy or rocky soils in humid areas; forests, dunes, cultivated areas, disturbed sites, roadsides.  0-970 m altitude. Weed of perennial crops, rice, vegetables and disturbed areas."  (Waterhouse & Mitchell, 1998; pp. 65-66).  In Hawai‘i, "forming mats in disturbed sites in grasslands, mesic shrubland and  mesic forest, 10-520 m" (Wagner et al., 1999; p. 1531).  In Fiji, "now widespread from sea level to 970 m.  It is a weed of cultivation, found along roadsides, in waste places, on open hillsides, and on sandy flats above beaches; it also occurs in dry forest, forming mats in open places, and it has become naturalized along forest trails" (Smith, 1979; pp. 323-324).  "Uncommon in dry sunny areas" (Whistler, 1988; p. 50).

Propagation:  "Seeds dispersed by water and birds.  Vegetative propagation from stolon fragments." (Waterhouse & Mitchell, 1998; pp. 65-66).

Native range:  India, southeastern Asia and Indonesia (Wagner et al., 1999; p. 1531). Fosberg et al. (1987; p. 37) list as native.

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Cook Islands
Southern Cook Islands
‘Atiu Island   McCormack, Gerald (2013)
Federated States of Micronesia
Chuuk Islands
Weno (Moen) Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 37)
Federated States of Micronesia
Pohnpei Islands
Pohnpei Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 37)
Federated States of Micronesia
Pohnpei Islands
Pohnpei Island native
Herrera, Katherine/Lorence, David H./Flynn, Timothy/Balick, Michael J. (2010) (p. 56)
Federated States of Micronesia
Yap Islands
Yap (Waqab) Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 37)
Fiji
Fiji Islands
Kandavu Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Voucher cited: DA 9073
Fiji
Fiji Islands
Koro Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Fiji
Fiji Islands
Mango Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Fiji
Fiji Islands
Matuku Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Fiji
Fiji Islands
Mbatiki Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Fiji
Fiji Islands
Moala Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Fiji
Fiji Islands
Moturiki Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Fiji
Fiji Islands
Ngau Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Fiji
Fiji Islands
Ovalau Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Voucher cited: DA 1362
Fiji
Fiji Islands
Totoya Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Fiji
Fiji Islands
Vanua Levu Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Vouchers cited: DA L.15609, DA 8791, DA 11771
Fiji
Fiji Islands
Vanua Mbalavu Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Fiji
Fiji Islands
Viti Levu Island introduced
invasive
Smith, Albert C. (1979) (pp. 323-324)
Vouchers cited: DA 8238, DA 8192, Smith 9615, Smith 9601, DA 7883, DA 7926, DA 3582, DA 3963, DA 2404
French Polynesia
Society Islands
Raiatea (Havai) Island introduced
invasive
Welsh, S. L. (1998) (p. 334)
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1531)
Voucher cited: Hitchcock 14186 (BISH)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
Wester, Lyndon (1992) (p. 121)
State of Hawaii
Hawaiian Islands
Lāna‘i Island introduced
Wester, Lyndon (1992) (p. 121)
State of Hawaii
Hawaiian Islands
Maui Island introduced
Wester, Lyndon (1992) (p. 121)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
Wester, Lyndon (1992) (p. 121)
State of Hawaii
Hawaiian Islands
Ni‘ihau Island introduced
Wester, Lyndon (1992) (p. 121)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
Wester, Lyndon (1992) (p. 121)
Palau
Palau (Belau ) (main island group)
Babeldaob Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 37)
Palau
Palau (Belau ) (main island group)
Babeldaob Island   Beleu National Museum (Republic of Palau. Koror.) (1982) (voucher ID: BNM 3179)
Taxon name on voucher: Digitaria fuscescens (Presl.) Henr.
Palau
Palau (Belau ) (main island group)
Koror (Oreor) Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 37)
Palau
Palau (Belau ) (main island group)
Koror (Oreor) Island native
Space, James C./Waterhouse, Barbara/Miles, Joel E./Tiobech, Joseph/Rengulbai, Kashgar (2003) (p. 97)
Philippines
Philippine Islands
Philippine Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Samoa
Western Samoa Islands
Western Samoa Islands   Whistler, W. A. (1988) (p. 50)
Tonga
Tonga Islands
Tonga Islands   Whistler, W. A. (1988) (p. 50)
Vanuatu
New Hebrides Islands
Vanuatu (Republic of)   Swarbrick, John T. (1997) (p. 91)
Wallis and Futuna
Wallis and Futuna (Horne) Islands
Wallis and Futuna Islands   Whistler, W. A. (1988) (p. 50)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Cambodia
Cambodia
Cambodia (Kingdom of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
China
China
China (People's Republic of)   Hafliger, Ernst/Scholz, Hildemar (1980) (p. 44)
Colombia
Colombia
Colombia (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Indonesia
Indonesia
Indonesia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Malaysia
Malaysia
Malaysia (country of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Singapore
Singapore
Singapore (Republic of)   Waterhouse, D. F. (1993) (p. 65)
Singapore
Singapore
Singapore (Republic of) native
Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 34)
Common
Thailand
Thailand
Thailand (Kingdom of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Vietnam
Vietnam
Vietnam (Socialist Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Indian Ocean
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
British Indian Ocean Territory
Chagos Archipelago
Diego Garcia Island introduced
invasive
Whistler, W. Arthur (1996) (p. 24)


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This page was created on 3 AUG 2002 and was last updated on 30 NOV 2008.