Pacific Island Ecosystems at Risk (PIER)

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Polypremum procumbens
L., Tetrachondraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: juniperleaf, rust weed, wireweed

Habit:  herb

Description:  "Low, spreading, glabrous herb with somewhat angled stems up to 12 cm long, readily branching at most nodes.  Leaves simple, opposite, blade linear, mostly 0.5-2.4 cm long, acuminate at the tip and base, surfaces glabrous, sometimes tinted red to orange, margins entire; subsessile.  Inflorescence of solitary, sessile, axillary flowers.  Corolla sympetalous, narrowly campanulate, 2.5-3 mm long, divided about halfway into 4 lobes; white.  Ovary superior; stamens 4, epipetalous.  Fruit an oval, laterally compressed, 2-lobed capsule 2-3 mm long, subtended by the 4 lanceolate, erect, slightly longer sepals.  Distinguishable by its small herbaceous habit, linear opposite leaves often red to orange in color, tiny, solitary, axillary, sessile white flowers, and small 2-lobed capsule"  (Whistler & Steele, 1999; p. 58).

Habitat/ecology:  In Hawai‘i, "reported as naturalized in Hawai‘i Volcanoes National Park, Hawai‘i" (Wagner et al., 1999; p. 850).  In the Marshall Islands, "a weed of open disturbed places, especially in sparse lawns with periodic mowing" (Kwajalein)  (Whistler & Steele, 1999; p. 58); in lawns and ruderal areas (Majuro) (Vander Velde, 2003; p.103).

Propagation:  Seed

Native range:  Tropical America (Whistler & Steele, 1999; p. 58).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Ecuador (Galápagos Islands)
Isabela Group
Isabela Island introduced
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Isabela Group
Volcán Alcedo, Isabela Island introduced
invasive
Charles Darwin Foundation (2008)
Guam
Guam Island
Guam Island introduced
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 211)
Guam
Guam Island
Guam Island introduced
Raulerson, L. (2006) (p. 55)
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 850)
Marshall Islands
Ralik Chain
Enewetak (Ãnewetak, Eniwetok) Atoll introduced
Fosberg, F. Raymond (1990) (p. 36)
Marshall Islands
Ralik Chain
Kwajalein (Kuwajleen) Atoll introduced
invasive
Whistler, W. A./Steele, O. (1999) (p. 58)
Vouchers cited: Herbst 8980, Herbst 9018, Herbst 9030, Herbst 9050, Whistler 11169, Whistler 11259
Marshall Islands
Ratak Chain
Majuro (Mãjro) Atoll introduced
invasive
Vander Velde, Nancy (2003) (p. 103)
Marshall Islands
Ratak Chain
Mili (Mile) Atoll introduced
invasive
Vander Velde, Nancy/Vander Velde, Brian (2010) (p. A17)
Uncommon; in fields, including runway, Mili, perhaps Tokewa.
Marshall Islands
Ratak Chain
Wotje (Wõjjã) Atoll introduced
Vander Velde, Nancy/Vander Velde, Brian (2009) (p. 2)
Voucher cited: Vander Velde 0514200925
Palau
Palau (Belau ) (main island group)
Angaur (Ngeaur) Island introduced
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 211)
Palau
Palau (Belau ) (main island group)
Angaur (Ngeaur) Island   Beleu National Museum (Republic of Palau. Koror.) (1970) (voucher ID: BNM 496)
Taxon name on voucher: Polypremum procumbens L.
Palau
Palau (Belau ) (main island group)
Angaur (Ngeaur) Island   Beleu National Museum (Republic of Palau. Koror.) (1977) (voucher ID: BNM 906)
Taxon name on voucher: Polypremum procumbens L.


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This page was created on 23 NOV 2006 and was last updated on 5 JAN 2007.