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Published In: Regni Vegetabilis Systema Naturale 2: 435. 1821. (Syst. Nat.) Name publication detailView 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. Chorispora tenella (Pall.) DC. (blue mustard)

Pl. 318 j–l; Map 1339

Plants annual (perennial elsewhere), terrestrial. Stems (5–)20–40(–56) cm long, erect to spreading, branched from the base and above, with stalked glands usually mixed with sparse, unbranched hairs. Leaves alternate and basal, (1.5–)3.0–8.0(–13.0) cm long, sparsely covered with stalked glands (rarely also a few unbranched hairs), usually short-petiolate, not clasping, the leaf blades oblanceolate to lanceolate or narrowly elliptic, shallowly and broadly toothed, those of the lower leaves less commonly deeply pinnately divided. Inflorescences usually racemes, the lower branches subtended by reduced leaves. Sepals (3–)4–6(–7) mm long, narrowly ascending, linear-lanceolate, sparsely covered with stalked glands. Petals 6–10(–12) mm long, not lobed, purple to bluish purple. Styles minute or absent at flowering, becoming elongated as a beak as the fruit matures. Fruits ascending, curved upward, (1.5–)3.0–5.0 cm long, more than 10 times as long as wide, linear, circular in cross-section, usually somewhat constricted between the seeds, the tip with a tapered beak 1–2 cm long, the valves lacking well-defined midnerves, not dehiscing, but breaking transversely into 2-seeded segments, glabrous or with stalked glands. Seeds in 1 row in each locule, imbedded in the thick, corky fruit-wall, 1.4–1.6 mm long, broadly ovate-elliptic in outline, flattened, the margins not winged, the surface smooth to minutely roughened, greenish yellow. 2n=14. April–June.

Introduced, known only from the city of St. Louis (native of Asia, widely naturalized in North America). Railroads.

 


 

 
 
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