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Published In: Flora Pedemontana 1: 257. 1785. (Fl. Pedem.) Name publication detail

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. Rapistrum rugosum (L.) All. (wild turnip, turnip weed)

R. rugosum var. venosum (Pers.) DC.

Pl. 324 c–e; Map 1380

Plants annual, terrestrial, rough-hairy mostly in the basal portion with simple, coarse hairs. Stems 20–100(–150) cm long, erect, branched in the upper half. Leaves alternate and basal, 1–20(–30) cm long, gradually reduced toward the stem tip, the bases not clasping the stem, the blades oblanceolate to elliptic in outline, the basal leaves petiolate, pinnately divided and coarsely toothed, those of the stems sessile or nearly so, unlobed but toothed. Inflorescences racemes at the tips of the branches, the flowers not subtended by bracts. Sepals 2.5–4.0(–5.0) mm long, oblong, erect or ascending. Petals 5–11 mm long, not lobed, yellow. Styles 1–3 mm long. Fruits erect or ascending, 5–7 mm long, segmented into apical and basal portions, the apical portion (1.5–)2.5–4.0 mm long, globose or nearly so, somewhat 5-ribbed, indehiscent, with a single seed, beaked with the persistent style, the basal portion thinner, 0.7–3.0 mm long, cylindrical to obovoid, dehiscing longitudinally, seedless or with one seed. Seeds 1.5–1.8 mm long, oblong in outline, the surface with a netlike or honeycomb-like pattern of ridges and pits, light orange. 2n=16. May–July.

Introduced, known thus far from a single site in Barry County (native of southern Europe, sporadically adventive nearly worldwide). Open, disturbed areas.

This species was first reported for Missouri by Rebman (1989) but is expected to appear in disturbed areas elsewhere in the future. Al-Shehbaz (1985) noted that although some European botanists subdivide this species into three subspecies, the almost total intergradation among these and the sporadic nature of the North American collections preclude the formal recognition of infraspecific taxa, at least for the adventive New World populations.



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