Pacific Island Ecosystems at Risk (PIER)

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Hypericum japonicum
Thunb., Hypericaceae
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Present on Pacific Islands?  no

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: di er cao

English: Japanese St. John's wort, matted St. John's-wort, swamp hypericum

Habit:  herb

Description:  "Prostrate to erect perennial herb, often forming mats and rooting at nodes, lacking black glands. Stems very slender, generally < 15 cm long, 4-angled, often brownish or reddish purple, ascending towards apex when flowering; internodes often short. Leaves sessile, (1)-3-7-(10) x (0.5)-1-3-(5) mm, usually ovate, oblong-ovate, elliptic, or obovate, occasionally linear, with pellucid glands; margin flat or undulate and crisped; base cuneate to rounded. Flowers terminal, solitary or few in cymes. Sepals 2-4 mm long, linear-oblong. Corolla (4)-5-8-(c. 10) mm in diameter., orange-yellow, = or a little > sepals. Stamens ± forming 3 bundles. Styles 3. Capsule 2-4.5 mm in diameter., broadly ellipsoid-ovoid to suborbicular, dry. Seeds 0.4-0.6 mm long, broad-cylindric to ellipsoid, reticulate" (Webb et al., 1988; p. 546).

Habitat/ecology:  In New Zealand, "lowland to montane open places, especially wet ground, sometimes in modified communities" (Webb et al., 1988; p. 546).

Propagation:  Seed

Native range:  Southern and eastern Asia, Australia, New Zealand (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Papua New Guinea
Papua New Guinea (eastern New Guinea Island)
Papua New Guinea (eastern New Guinea Island) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Philippines
Philippine Islands
Philippine Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Philippines
Philippine Islands
Philippine Islands   Merrill, Elmer D. (1923) (p. 75)
In open waste places, paddy banks, along streams, and in cultivated ground, altitude 700 to 2,400 m; common in the Mountain Province.
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 native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Australia
Australia (continental)
Queensland native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
China
China
China (People's Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Indonesia
Indonesia
Indonesia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Japan
Japan
Japan (country) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Malaysia
Malaysia
Malaysia (country of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
New Zealand
New Zealand
New Zealand (country) native
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 546)
Singapore
Singapore
Singapore (Republic of) uncertain if introduced
invasive
Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 50)
Weed of uncertain origin
Taiwan
Taiwan Island
Taiwan Island native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
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)


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This page was created on 5 MAR 2007 and was last updated on 5 MAR 2007.