Sisymbrium irio L., Brassicaceae

Click on an image for links to BIGGER PICTURES

Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: shui suan jie

English: London rocket, rocket mustard

French: sisymbre irio, vélaret

Spanish: eskorbut-bedarra, jaramago, matacandil, mostacilla, nabillo, rabanillo

Habit:  herb

Description:  "Erect annual herbs 2-10 dm tall, unbranched or branched above base, usually glabrous throughout, sometimes very sparsely hirsute above.  Leaves ovate to lanceolate in outline, pinnately lobed, with an ovate or triangular terminal segment, lateral lobes lanceolate to oblong, usually 6-20 cm long.  Pedicels slender, spreading, 0.5-2 cm long in fruit; sepals elliptic-lanceolate, 2-2.5 mm long; petals pale yellow, fading to almost white before falling, 3-4 mm long.  Siliques linear, terete, 3-5 cm long, greater in diameter than the pedicels.  Seeds oblong, ca. 0.8 mm long, wingless" (Wagner et al., 1999; p. 413).

Habitat/ecology:  "In Hawai‘i, "naturalized in relatively dry, disturbed areas in the saddle area between Mauna Kea and Mauna Loa, Hawai‘i [Island]"  (Wagner et al., 1999; p. 413).

Propagation:  Seed

Native range:  "Europe, now widely naturalized" (Wagner et al., 1999; p. 413).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 413) Voucher cited: Kawasaki 1 (BISH)

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)	Australia (continental)		Hafliger, Toni J./Wolf, Matthias (1988) (p. 202)
China China	China (People's Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013) Xinjiang
Japan Japan	Japan	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 183)
Mexico Mexico	Mexico (United Mexican States)		Hafliger, Toni J./Wolf, Matthias (1988) (p. 202)

Control:  If you know of control methods for Sisymbrium irio, please let us know.