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Erect, somewhat stout perennial herb up to 60-(80) cm tall at flowering; stems green or reddish, clothed with short and long pilose hairs and glands. Lvs mostly cauline, those of the lower ⅓ often withering by anthesis; petiole up to 130 mm long, pilose and glandular; blade orbicular, palmate; leaflets (5)-7, oblong-obovate to linear-lanceolate, sessile, (15)-25-65-(110) × 5-15-(25) mm, sparsely to moderately covered in pilose and short hairs on both surfaces or with only short hairs on upper; margins deeply serrate or occasionally almost pinnatisect, with 8-12-(17) pairs of teeth on terminal leaflet; stipules long-triangular, acute, with up to 3 teeth; upper lvs reduced with fewer narrower leaflets, finally ± sessile. Fls 5-merous, many in lax, terminal cymes. Epicalyx segments linear-lanceolate, acute, entire. Sepals ± narrow-ovate, c. 4-6 mm long, pilose with longer hairs scattered among shorter hairs, c. = epicalyx segments, connate at base. Petals obovate, (5)-7-10-(12) mm long, pale yellow, deeply emarginate. Styles filiform. Achenes reticulate, narrowly winged, c. 1.2-1.8 mm long.
Perennial; stems erect, 4-8 dm, simple to the infl, pubescent; lvs palmately compound, the lower long-petioled, with 5-7 lfls, the upper smaller, with shorter or no petiole and only 3 lfls; lfls radially divergent, narrowly oblanceolate, deeply toothed; infl flattened, with many fls; sep and bractlets lance-ovate, subequal; pet sulphur-yellow, 1 cm; anthers 1.0-1.5 mm; style terminal; achenes striate with low curved ridges; 2n=42. Native of Europe, found as a frequent weed in dry soil and waste places throughout our range. June-Aug. (P. sulphurea)
Cauline leaves: petiole (3–)4–8 cm, long hairs common, 2–4 mm, short hairs common to abundant; leaflets 5–7, 1.5–10 × 0.5–3.5 cm, long hairs common, 0.5–2 mm abaxially, 1 mm and stiffly appressed adaxially, short hairs common on primary veins abaxially, glands sparse to common abaxially. Flowers: epicalyx bractlets narrowly lanceolate to lanceolate, 5–12 × 1–2 mm; sepals 4–10(–12) mm, apex acute to acuminate; petals (4–)7–10(–13) × 7–10 mm; filaments 0.5–2.8 mm, anthers 0.8–1.2 mm; carpels 80–140. Achenes 1.2–1.8 mm. 2n = 28, 42 (Eurasia).
