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Published In: Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 54(3, Beibl. 119): 56. 1916. (Bot. Jahrb. Syst.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Introduced

 

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1. Erucastrum gallicum (Willd.) O.E. Schulz (dog mustard, rocketweed)

Sisymbrium gallicum Willd.

Pl. 319 d, e; Map 1350

Plants annual or biennial, terrestrial. Stems 20–75 cm long, erect, branched from the base, pubescent with unbranched hairs. Leaves alternate and basal, 3–15(–25) cm long, the upper leaves progressively reduced, petiolate, not clasping, the leaf blades oblong to oblanceolate, 1 or 2 times pinnately divided, the divisions usually irregularly toothed, pubescent with unbranched hairs. Inflorescences panicles, the branches and most of the flowers subtended by reduced, leaflike bracts. Sepals 2–4(–5) mm long, ascending, narrowly oblong. Petals 4–7 mm long, not lobed, pale yellow. Styles 1.5–3.0 mm long. Fruits ascending, straight, 2–4 cm long, more than 10 times as long as wide, linear, somewhat 4-angled in cross-section, not beaked except for the persistent style, each valve with a raised, sometimes winglike midnerve, dehiscing longitudinally. Seeds in 1 row in each locule, 1.2–1.3 mm long, oblong in outline, not winged, the surface with a fine, netlike or honeycomb-like pattern of ridges and pits, reddish orange. 2n=30. May–September.

Introduced, Jackson County and the city of St. Louis (native of Europe, Asia, widely introduced in North America). Ditches and railroads.

Plants of Erucastrum bear a strong resemblance to some Brassica species but differ in several subtle morphological features of the inflorescences, flowers, and fruits (Al-Shehbaz, 1985; Rollins, 1993), in addition to those presented in the key to genera above.

The spread of E. gallicum in North America was documented by Luken et al. (1993). The species was first documented in the United States from collections made along railroads in Wisconsin in 1903, and it was first collected in Missouri in 1918. It is presently known from at least 29 states and all of the Canadian provinces and territories. However, because of heavy herbicide use along railroads during the past few decades, it probably no longer occurs at many of its former sites.

 


 

 
 
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