Alliaria petiolata
Bull. Orto Bot. Regia Univ. Napoli 3: 418. 1913.
Stems simple or branched distally, (1.5–)3–9(–13) dm; glabrous or pilose basally, trichomes to 1.5 mm. Basal leaves: petiole 3–16(–22) cm; blade reniform or cordate, (6–)15–88(–118) mm wide (shorter in length), surfaces glabrous or pilose. Cauline leaves: petiole shorter than basal; blade ovate, cordate, or deltate, to 15 × 15 cm, base cordate or truncate, margins acutely to obtusely toothed, apex acute. Racemes several-flowered. Fruiting pedicels terete, (2–)3–10(–15) mm. Flowers: sepals (2–)2.5–3.5(–4.5) × 0.7–1.5 mm; petals (2.5–)4–8(–9) × (1.5–)2–3(–3.5) mm, base attenuate to clawlike; filaments 2–3.5(–4.5) mm; anthers oblong, 0.7–1 mm. Fruits divaricate-ascending, subtorulose, quadrangular or subterete, (2–)3–7(–8) cm × 1.2–2.5 mm; style (0.2–)1–2(–3) mm. Seeds dark brown or black, narrowly oblong, 2–4.5 × 0.7–2 mm. 2n = 42.
Phenology: Flowering Apr–May.
Habitat: Roadsides, trails, railroad tracks, stream banks, waste places, fields, shaded woodlands, bluffs, thickets, steep slopes, disturbed fields, floodplains, woods, shaded forest floor
Elevation: 0-1200 m
Distribution
B.C., Ont., Conn., Del., D.C., Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Mo., Nebr., N.H., N.J., N.Y., N.C., Ohio, Okla., Oreg., Pa., R.I., Tenn., Utah, Vt., Va., Wash., W.Va., Wis., South America (Argentina), Eurasia, n Africa.
Discussion
Selected References
None.