Thlaspi arvense

Linnaeus

Sp. Pl. 2: 646. 1753.

Common names: Fanweed field pennycress stinkweed
WeedyIntroduced
Synonyms: Teruncius arvensis (Linnaeus) Lunell
Treatment appears in FNA Volume 7. Treatment on page 746.

Plants (sometimes glaucous), glabrous throughout. Stems (0.9–)1.5–5.5(–8) dm. Basal leaves not rosulate; petiole 0.5–3 cm; blade oblanceolate, spatulate, or obovate, 1–5 cm × 4–23 mm, base attenuate or cuneate, margins entire, repand, or coarsely dentate, apex rounded. Cauline leaves: blade oblong, (0.5–)1.5–4(–8) cm × (2–)5–15(–25) mm, apex rounded, obtuse, or subacute. Fruiting pedicels straight or slightly upcurved, (5–)9–13(–15) mm. Flowers: sepals (1.5–)2–3(–3.3) × 1–1.5 mm; petals (2.4–)3–4.5(–5) × (0.8–)1.1–1.7 mm, narrowed to clawlike base (ca. 1 mm), apex obtuse or emarginate; filaments (1–)1.5–2.2 mm; anthers 0.3–0.5 mm. Fruits obovate or suborbicular, (0.6–)0.9–2 cm × (5–)7–20 mm, base obtuse or rounded, apex deeply emarginate, notch ca. 5 mm deep; wings broad throughout, 1–1.5 mm wide basally, 3.5–5 mm wide apically; ovules 6–16 per ovary; style 0.1–0.3 mm. Seeds (1.2–)1.6–2(–2.3) × 1.1–1.3 mm, concentrically striate. 2n = 14.


Phenology: Flowering Mar–Aug.
Habitat: Roadsides, fields, waste places, lawns, gardens, railroad tracks, stream banks, bluffs, thickets, slopes, floodplains, woods
Elevation: 0-2000 m

Distribution

V7 1313-distribution-map.gif

Introduced; Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon, Ala., Alaska, Ariz., Ark., Calif., Colo., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., Europe, Asia.

Discussion

Thlaspi arvense is a cosmopolitan weed of Eurasian origin. Cattle feeding on it develop tainted milk.

Lower Taxa

None.
... more about "Thlaspi arvense"
Ihsan A. Al-Shehbaz +
Linnaeus +
Fanweed +, field pennycress +  and stinkweed +
Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Ala. +, Alaska +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Utah +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Wyo. +, Europe +  and Asia. +
0-2000 m +
Roadsides, fields, waste places, lawns, gardens, railroad tracks, stream banks, bluffs, thickets, slopes, floodplains, woods +
Flowering Mar–Aug. +
best1975a +
Weedy +  and Introduced +
Teruncius arvensis +
Thlaspi arvense +
species +