Chorispora tenella
Syst. Nat. 2: 435. 1821.
Plants papillose, sometimes pubescent, papillae sometimes mixed with simple trichomes. Stems (0.5–)1–4(–5.6) dm. Basal leaves (often withered by flowering); petiole (0.5–)1–2(–4) cm; blade oblanceolate or oblong, (1.5–)2.5–8(–13) cm × (4–)8–20(–30) mm, base cuneate or attenuate, apex acute, surfaces glandular. Cauline leaves similar to basal, distalmost subsessile, blades smaller distally. Fruiting pedicels (2–)3–5 mm, glandular. Flowers: sepals purplish, (3–)4–5(–6) × 0.5–0.7 mm; petals 8–10(–12) × 1–2 mm, claw 6–7 mm; filaments 4–6(–7) mm; anthers ca. 1.5 mm.Fruits slightly curved-ascending, (1.4–)1.8–2.5(–3) cm × 1.5–2 mm, with 8–12 constrictions on each side; style (6–)10–18(–22) mm. Seeds brown, 1–1.4 × 0.8–1 mm. 2n = 14.
Phenology: Flowering Apr–Jul.
Habitat: Waste places, pastures, fields, roadsides, railroad embankments, grassy slopes
Elevation: 0-2300 m
Distribution
Introduced; Alta., B.C., Sask., Ariz., Calif., Colo., Idaho, Ill., Ind., Iowa, Kans., La., Mass., Mich., Mo., Mont., Nebr., Nev., N.Mex., N.Y., N.Dak., Ohio, Okla., Oreg., S.Dak., Tenn., Tex., Utah, Wash., Wyo., Europe, Asia, n Africa, introduced also in South America.
Discussion
Chorispora tenella appears to be most widely distributed in Colorado, Nevada, and Wyoming, of all the provinces and states listed above.
Selected References
None.