Datura stramonium L., Solanaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  Evaluate, score: 5 (Go to the risk assessment)

Common name(s): [more details]

Chinese: man tuo luo

English: common thorn-apple, datura, false castor-oil, jimson weed, moonflower, purple thorn-apple, thorn apple

French: datura stramoine, herbe des taupes, pomme épineuse

Hawaiian: kīkānia, kīkānia haole, lā‘au hānō

Hindi: hurhur

Japanese: shirobana-chosen-assgao

Spanish: chamico, chamico azul, datura manzana, estramonio, manzana espinosa, miyaya, peo de fraile, tapa, tapete, toloache

Habit:  herb

Description:  "Stout, malodorous, erect annual herbs; stems branched above, glabrous or sparsely pubescent with simple hairs.  Leaves simple, rhomboid to angularly ovate, in juvenile phase large and coarse, later leaves often 8-16 cm long, 4-10 cm wide, margins coarsely doubly lobed, apex acute to acuminate, base oblique, rarely equal, petioles 3-11 cm long.  Flowers solitary in stem forks, peduncles 6-10 mm long, pedicels stout, 7-20 mm long; calyx angularly tubular, 5-lobed, 3-4.5 cm long, the lobes 0.6-0.8 cm long; corolla white or tinged lavender, 5-lobed, the lobes rounded, 6-9 cm long, separated by sinuses and terminated by a pointed tip; stamens 5; anthers white or purple, 3-4 mm long, opening by slits; ovary 2-celled; style 4-5.5 cm long; stigma 2.5 mm long, 2 mm wide, included.  Capsules erect, narrowly ovoid to ovoid, 2.5-4 cm long, 2-3 cm wide, opening by 4 valves when ripe, the valves 6-10 mm long, covered with numerous conical spines of various lengths, the persistent calyx base 4-10 mm long, reflexed, margins irregular.  Seeds numerous, black or dark brownish gray, angularly D-shaped, 3-4 mm long, coarsely pitted, embryo curved, endosperm present"  (Wagner et al., 1999; p. 1257).

Habitat/ecology:  "The weed requires disturbed sites for establishment and thus is found on cultivated land, in animal camps, barnyards, on roadsides, and in areas laid waste by man's activities.  It prefers rich soil and plentiful rainfall but can survive in sandy pastures and many such difficult places" (Holm et al., 1997; p. 275).

"Usually in disturbed soil along trails and roadsides or at margins of cultivated fields and in abandoned agricultural land; from Transition to Miconia zones in the Galápagos Islands" (Wiggins & Porter, 1971; p. 464-465). In Hawai‘i, "naturalized in dry, disturbed sites, 0-690 m" (Wagner et al., 1999; p. 1257).  In Fiji, "sparingly naturalized near sea level as a weed of waste places and canefields"  (Smith, 1991; p. 32).  "In Chile this species grows in the following environmental conditions:  Low altitude, interior valleys; coastal mountains, 500-2000 m; coastal areas, 0-500 m.  Somewhat dry areas where the drought may last 3-5 months, precipitations of 400-800 mm. are concentrated in winter.  Fully exposed to the sun, level areas or slopes facing north"  (Chileflora).

Propagation:  Seed.  "It is spread in agricultural seedstocks, in field grains, in the packed soil on the wheels and frames of farm machinery, and in the mud that clings to the fur and feathers of animals.  Capsules and seeds can float for 10 hours" (Holm et al., 1997; p. 275). "Seeds long-lived with 91% germination after 39 years of burial"  (Motooka et al., 2003).

Native range:  North America (Wagner et al., 1999; p. 1257). Probably native to Mexico but exact native range obscure; widely naturalized elsewhere (GRIN).

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. 208)
Australia (Pacific offshore islands) Lord Howe Island	Lord Howe Island	introduced invasive	Orchard, Anthony E., ed. (1994) (p. 21) "Naturalised and occasional". Vouchers cited: J.L. Boorman (NSW), J.D. McComish 145 (NSW)
Australia (Pacific offshore islands) Norfolk Islands	Norfolk Island	introduced invasive	Orchard, Anthony E., ed. (1994) (p. 10) "Naturalised and occasional". Vouchers cited: W.R. Sykes 784/87 (CHR), W.R. Sykes NI 182 (CHR)
Chile (offshore islands) Juan Fernández Islands	Isla Más a Tierra (Robinson Crusoe Island)	introduced invasive cultivated	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. 553)
Ecuador (Galápagos Islands) Floreana Group	Floreana Island	introduced invasive cultivated	Charles Darwin Foundation (2008) var. stramonium and var. tatula
Ecuador (Galápagos Islands) Isabela Group	Isabela Island	introduced invasive cultivated	Charles Darwin Foundation (2008) var. stramonium and var. tatula
Ecuador (Galápagos Islands) Isabela Group	Volcán Alcedo, Isabela Island	introduced invasive cultivated	Charles Darwin Foundation (2008) var. tatula
Ecuador (Galápagos Islands) Isabela Group	Volcán Cerro Azul, Isabela Island	introduced invasive cultivated	Charles Darwin Foundation (2008) var. tatula
Ecuador (Galápagos Islands) Isabela Group	Volcán Sierra Negra, Isabela Island	introduced invasive cultivated	Charles Darwin Foundation (2008) vars. stramonium and tatula
Ecuador (Galápagos Islands) Isabela Group	Volcán Wolf, Isabela Island	introduced invasive cultivated	Charles Darwin Foundation (2008) var. tatula
Ecuador (Galápagos Islands) San Cristóbal Group	San Cristóbal Island	introduced invasive cultivated	Charles Darwin Foundation (2008) var. stramonium and var. tatula
Ecuador (Galápagos Islands) Santa Cruz Group	Santa Cruz Island	introduced invasive cultivated	Charles Darwin Foundation (2008) var. stramonium
Ecuador (Galápagos Islands) Santiago Group	Santiago Island	introduced invasive cultivated	Charles Darwin Foundation (2008) var. stramonium and var. tatula
Fiji Fiji Islands	Ovalau Island	introduced invasive	Smith, Albert C. (1991) (pp. 32-33) Voucher cited: Seemann 348 Sparingly naturalized.
Fiji Fiji Islands	Vanua Levu Island	introduced invasive	Smith, Albert C. (1991) (pp. 32-33) Voucher cited: Greenwood 686 Sparingly naturalized.
Fiji Fiji Islands	Viti Levu Island	introduced invasive	Smith, Albert C. (1991) (pp. 32-33) Voucher cited: DA 8989 Sparingly naturalized.
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1257)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1257)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1257)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1257)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1257)
New Caledonia Îles Chesterfield	Îles Chesterfield	introduced	MacKee, H. S. (1994) (p. 130) Voucher cited: Godard in Veillon 6454
New Caledonia New Caledonia	New Caledonia Islands		Swarbrick, John T. (1997) (p. 91)
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. 130) Vouchers cited: Cherrier in MacKee 36067, Thomas in MacKee 38698 Spontané
New Zealand (offshore islands) Kermadec Islands	Raoul Island	introduced	Sykes, W. R. (1977) (pp. 141-142)
New Zealand (offshore islands) Kermadec Islands	Raoul Island	introduced invasive	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 1124) "Very occasional on Raoul Island".
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
Philippines Philippine Islands	Philippine Islands		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
Tonga Tonga Islands	Tonga Islands		Swarbrick, John T. (1997) (p. 91)
Tonga Vava‘u Group	Vava‘u Island	introduced	Yuncker, T. G. (1959) (p. 240) Infrequent. Cited: Crosby.

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		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
Australia Australia (continental)	Northern Territory		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
Australia Australia (continental)	Queensland		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
Central America Central America (Pacific rim)	Costa Rica (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 120-121)
Central America Central America (Pacific rim)	Guatemala (Republic of)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 283)
Central America Central America (Pacific rim)	Honduras (Republic of)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 283)
China China	China (People's Republic of)	introduced invasive cultivated	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013) Near houses, roadsides, grasslands; 600-1600 m. Throughout China. Cultivated in gardens as a medicinal and decorative plant.
China China	Hong Kong	introduced cultivated	Wu, Te-lin (2001) (p. 218) Ornamental.
Indonesia Indonesia	Indonesia (Republic of)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
Japan Japan	Japan		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
Japan Japan	Japan	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 188) var. stramonium and var. inermis (Juss ex Jacq.) Schinz & Thell
South Korea South Korea	South Korea (Republic of)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
Mexico Mexico	Mexico (United Mexican States)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013) Probably native
New Zealand New Zealand	New Zealand (country)	introduced invasive	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 1124) "Waste places such as roadsides, building sites, old gardens, as well as cultivated ground, sometimes abundant on recently disturbed ground but often only as isolated plants".
South America (Pacific rim) South America (Pacific rim)	Chile (Republic of)	introduced invasive cultivated	Belov, Michail (2013)
South America (Pacific rim) South America (Pacific rim)	Colombia		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
South America (Pacific rim) South America (Pacific rim)	Ecuador (Republic of) (continental)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
South America (Pacific rim) South America (Pacific rim)	Perú (Republic of)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)
Taiwan Taiwan Island	Taiwan Island	introduced invasive cultivated	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Thailand Thailand	Thailand (Kingdom of)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 273)

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Seychelles Seychelles Islands	Agalega Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Stoddart, D. R. (1983) (p. 137)
Seychelles Seychelles Islands	Seychelles Islands	introduced	Invasive Species Specialist Group (2017)

Control: 

Physical:  "Isolated plants can be manually removed before fruiting.  Larger infestation in arable lands can be cultivated prior to seed set"  (Motooka et al., 2003)..

Chemical:  "Effective pre-emergence herbicides are atrazine or dicamba.  Seedlings and larger plants can be sprayed with dicamba, 2,4-D or bromoxyril"  (Weber, 2003; p. 137).  "Young plants susceptible to hormone-type herbicides and glyphosate and to soil-applied tebuthiuron.  Also sensitive to metsulfuron"  (Motooka et al., 2003).