Pacific Island Ecosystems at Risk (PIER)

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Stachys arvensis
L., Lamiaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: tian ye shui su

English: staggerweed

Habit:  herb

Description:  "Stems decumbent to ascending, many-branched, 2-6 dm long, hirsute.  Leaves ovate to narrowly ovate, 1-3.5 (-6) cm long, 0.6-2.3 (-3.5) cm wide, hirsute, more densely so along veins on lower surface, margins crenate, apex rounded, base truncate to subcordate, petioles 0-2 (-3.5) cm long.  Flowers usually 3-6 in verticillasters, these arranged in terminal, leafy, spike-like inflorescences; calyx usually tinged purple, campanulate, 5-6 mm long, hirsute, especially along nerves, cleft ca. " its length, the teeth slightly unequal, lanceolate, upper lobes ca. 2.7-2.8 mm long, lower lobe ca. 2.2-2.3 mm long; corolla pink, rose, or blue, 5-7 mm long, upper lip erect, median lobe of lower lip ovate, faintly spotted red near base.  Nutlets black, shiny, muricate, obovoid, ca. 2 mm long"  (Wagner et al., 1999; pp. 830-831).

Habitat/ecology:  In Hawai‘i, "naturalized in low elevation, dry, disturbed habitats, 2-1,200 m" (Wagner et al., 1999; pp. 830-831).  In Tonga, "rare in disturbed places" (Whistler, 1988; p. 21). In New Caledonia, "mauvaise herbe peu commune" (MacKee, 1994; p. 70).

Propagation:  Seed

Native range:  Europe and Asia (Wagner et al., 1999; pp. 830-831).

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
Pickard, J. (1984) (p. 207)
Australia (Pacific offshore islands)
Lord Howe Island
Lord Howe Island introduced
invasive
Orchard, Anthony E., ed. (1994) (p. 20)
"A weed of disturbed ground". Vouchers cited: A.N. Rodd 1432 (K, NSW); J. Pickard 2953 (NSW); 1920, J.L. Boorman (NSW); J.D. McComish 199 (NSW)
Australia (Pacific offshore islands)
Norfolk Islands
Norfolk Island introduced
invasive
Orchard, Anthony E., ed. (1994) (p. 9)
"A weed of disturbed ground". Vouchers cited: P.S. Green 1880 (K); 1898, I. Robinson (NSW)
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) (p. 558)
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 831)
State of Hawaii
Hawaiian Islands
Kaho‘olawe Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 831)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 831)
State of Hawaii
Hawaiian Islands
Lāna‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 831)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 831)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 831)
State of Hawaii
Hawaiian Islands
Ni‘ihau Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 831)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 831)
Voucher cited: Mann & Brigham 277 (BISH)
New Caledonia
New Caledonia Archipelago
Île Grande Terre introduced
invasive
Tassin, Jacques (2005)
New Caledonia
New Caledonia Archipelago
Île Grande Terre introduced
invasive
MacKee, H. S. (1994) (p. 70)
Vouchers cited: Deplanche 360 s.loc., Vieillard 1059, MacKee 13384, MacKee 17595, MacKee 29363, MacKee 37241
New Caledonia
New Caledonia Archipelago
Île des Pins (Isle of Pines) introduced
invasive
Tassin, Jacques (2005)
New Caledonia
New Caledonia Archipelago
Île des Pins (Isle of Pines) introduced
invasive
MacKee, H. S. (1994) (p. 70)
Voucher cited: Pancher 597
New Zealand (offshore islands)
Kermadec Islands
Raoul Island introduced
invasive
Sykes, W. R. (1977) (pp. 110-111)
New Zealand (offshore islands)
Kermadec Islands
Raoul Island introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 795)
"A weed of gardens, fields, waste places, roadsides, and river beds".
Pitcairn Islands
Pitcairn Islands
Pitcairn Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Voucher cited: J. Florence 11022 (PAP)
Adventice
Tonga
Tongatapu Group
Tongatapu Island   Whistler, W. A. (1988) (p. 21)
Rare per Whistler.
Tonga
Tongatapu Group
Tongatapu Island   Whistler, W. A. (1992) (p. 39)
Voucher cited: Setchell & Parks 15632
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
China
China
China (People's Republic of) introduced
invasive
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Weed in waste areas adjacent to cultivated land. Fujian, Guangdong, Guangxi.
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 188)
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 795)
"A weed of gardens, fields, waste places, roadsides, and river beds".
Taiwan
Taiwan Island
Taiwan Island introduced
invasive
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Weed in waste areas adjacent to cultivated land.


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This page was created on 7 AUG 2002 and was last updated on 26 OCT 2006.