Pacific Island Ecosystems at Risk (PIER)

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Sherardia arvensis
L., Rubiaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

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

Common name(s): [more details]

English: blue field-madder, field-madder, herb-sherard, shérardie des champs

Habit:  herb

Description:  Slender annual herbs; stems prostrate, quadrangular, 1-4 dm long, sparsely scabrid with small deflexed hairs.  Leaves and leaf-like stipules in whorls of 4-6 per node, stiff and pungent.  Lower leaves obovate-cuspidate, quickly withering, upper leaves oblanceolate, 5-20 mm long, 1-5 mm wide, apex mucronate.  Flowers in involucrate clusters, the involucral segments up to 10, connate;  4-10 per head; sepals 4-6, persistent; corolla 4-5 mm long, blue or pink, funnelform, 4-5-lobed; stamens 4-5; ovules 1 per cell; style filiform, 2-lobed. Fruit didymous, 2-7 mm long, scabrid, dry, forming 2 indehiscent cocci.  Seeds 1 per coccus  (adapted from Wagner et al., 1999; p. 1171).

Description from Flora of Australia online.
Description from Flora of New Zealand online.

Habitat/ecology:  In Hawai‘i, "naturalized in dry, open, disturbed sites, 600-2,270 m"  (Wagner et al., 1999; p. 1171).  In New Zealand, "locally common to abundant, especially poor, depleted or short pastures and lawns, and waste places, also cultivated land, roadside banks, streamsides and tussock grasslands to c. 500 m"  (Webb et al., 1988; 1150).

Propagation:  Seed

Native range:  Eurasia  (Wagner et al., 1999; p. 1171).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Australia (Pacific offshore islands)
Lord Howe Island
Lord Howe Island introduced
invasive
Australian Biological Resources Study (2013)
Australia (Pacific offshore islands)
Norfolk Islands
Norfolk Island introduced
invasive
Australian Biological Resources Study (2013)
Chile (offshore islands)
Juan Fernández Islands
Isla Más a Tierra (Robinson Crusoe Island) introduced
invasive
Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands)
Juan Fernández Islands
Isla Más a Tierra (Robinson Crusoe Island) introduced
invasive
cultivated
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (pp. 498, 544, 557)
Voucher cited: Danton I(5/255)1598. "En RC, se encuentra por aqui y allá como adventicia en el territorio de la Ilustre Municipalidad de Juan Fernández (paredes del Fuerte Santa Bárbara, pastos en los alrededores de El Pangal) y en SC, donde una gran población ya está presente en las pendientes del Cerro Johow.  Es una especie de la cual su rápida dispersión está unida con las introducciones de ganado y forraje procedentes del continente y de los movimientos entre islas".
Chile (offshore islands)
Juan Fernández Islands
Isla Santa Clara introduced
invasive
Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands)
Juan Fernández Islands
Isla Santa Clara introduced
invasive
cultivated
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (pp. 498, 544, 557)
Voucher cited: Danton I(5/326)1673. "En RC, se encuentra por aqui y allá como adventicia en el territorio de la Ilustre Municipalidad de Juan Fernández (paredes del Fuerte Santa Bárbara, pastos en los alrededores de El Pangal) y en SC, donde una gran población ya está presente en las pendientes del Cerro Johow.  Es una especie de la cual su rápida dispersión está unida con las introducciones de ganado y forraje procedentes del continente y de los movimientos entre islas".
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1171)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1171)
East Maui. Voucher cited: Faurie 988 (BISH)
New Zealand (offshore islands)
Kermadec Islands
Kermadec Islands introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 1150)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Australia
Australia (continental)
New South Wales introduced
invasive
National Herbarium of New South Wales (2013)
"Weed of gardens and disturbed areas".
Australia
Australia (continental)
Northern Territory introduced
invasive
National Herbarium of New South Wales (2013)
"Weed of gardens and disturbed areas".
Canada (British Colombia)
Province of British Columbia
Canada (British Columbia) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 187)
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 1150)
United States (west coast)
United States (west coast states)
USA (Oregon) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (California) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (Washington) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Canada (except British Colombia)
Canada
Canada (country) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (continental except west coast)
United States (other states)
United States (other states) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (continental except west coast)
United States (other states)
USA (Florida) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)


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

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This page was created on 16 DEC 2010 and was last updated on 13 JAN 2011.