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Published In: Species Plantarum 2: 661. 1753. (1 May 1753) (Sp. Pl.) 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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2. Erysimum cheiranthoides L. (wormseed mustard, wormseed wallflower)

Pl. 321 e, f; Map 1352

Plants annual or biennial. Stems 1 or few per plant, 15–75(–100) cm long, usually unbranched or less commonly few-branched in the inflorescence, pubescent with 2-branched hairs. Leaves (1–)2–9(–11) cm long, linear to lanceolate or oblanceolate, the margins usually entire or less commonly shallowly and broadly toothed, pubescent with mostly 3-branched hairs. Inflorescences mostly racemes. Sepals 2.0–3.5 mm long. Petals 3–5 mm long, light yellow to yellow. Styles 0.5–1.0(–1.5) mm long. Fruits erect or ascending, (1.0–)1.5–2.5(–4.0) cm long, circular to somewhat 4-angled in cross-section, the valves pubescent on the inside and outside with mostly 3-branched hairs, the stalks slender and noticeably narrower than the fruits. Seeds 0.8–1.1(–1.5) mm long, oblong-elliptic in outline, somewhat flattened, often pointed at the tip, not winged. 2n=16. May–September.

Introduced, uncommon and widely scattered, mostly in central and northwestern Missouri (native of Europe, Asia, and possibly western North America, widely introduced in the U.S.). Roadsides, railroads, and open, disturbed areas.

Rollins (1993) has noted the controversy over whether this species is indigenous in some parts of Alaska, Canada, and the Rocky Mountain states. The application of subspecific names to North American plants also is problematic. The other subspecies, ssp. altum Ahti, originally was designated for plants from far northern Europe and Asia that are taller than plants of ssp. cheiranthoides and have more internodes, as well as long-tapered leaves appressed to the stems. Rollins (1993) pointed out that patterns of north-to-south variation in this country approximate those in the Old World, however, and that the American plants are not easily subdivided into discreet taxa. Most authors treat all North American materials as belonging to ssp. cheiranthoides.

 
 


 

 
 
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