Roots robust, terete. Stems erect, 25–70 cm tall, pilose or hirtellous. Radical leaves lyrately pinnate, 10–35 cm including petiole, with 2–4 pairs of leaflets, both surfaces scattered strigose; leaflets unequal, terminal one largest, usually rhombic-ovate, lobed, 4–9 × 3–8 cm, base broadly cuneate or subtruncate, margin markedly incised-lobed to 3-parted and coarsely serrate, apex rounded; cauline leaves: stipules green, ovate-elliptic, lobed to parted, herbaceous; leaf blade simple, 3-lobed or 3-parted. Inflorescence usually nodding, laxly 2–4-flowered. Flowers 2–2.5 cm in diam.; pedicel densely yellow pubescent and pilose. Sepals ovate-triangular, apex acuminate; epicalyx segments usually purplish, linear-lanceolate, minute, 1/3–1/2 as long as sepals, apex acuminate. Petals yellow, purple-brown striate, semiorbicular, longer than sepals, base abruptly tapered into a rather long claw. Style terminal, filiform, twisted at joint; proximal section yellow villous; distal section deciduous at fruit maturity. Fruiting receptacle hirtellous, hairs 1.5–2 mm; achenes yellow villous; proximal section of style persistent. Fl. and fr. May–Aug.
Plants leafy-stemmed. Stems 30–85 cm, sparsely downy to scattered-hirsute proximally, downy distally. Leaves: basal 6–40 cm, blade interruptedly pinnate, major leaflets 5–7, mixed with 7–14 minor ones, terminal leaflet slightly larger than major laterals; cauline 2–10 cm, stipules ± free, 7–18 × 5–9 mm, blade pinnate to 3-foliolate. Inflorescences 2–8-flowered. Pedicels densely downy, some hairs glandular. Flowers nodding; epicalyx bractlets 2–4 mm; hypanthium greenish maroon to maroon; sepals erect, 7–10 mm; petals erect, yellow, suffused with purple and purple-veined, spatulate-obovate, 8–10 mm, ± equal to sepals, apex rounded, truncate, or shallowly emarginate. Fruiting tori on 4–10 mm stipes, densely bristly. Fruiting styles geniculate-jointed, proximal segment persistent, 5–9 mm, apex hooked, stipitate-glandular, bristles on basal 1/2, distal segment deciduous, 3–4.5 mm, pilose except apical 1 mm. 2n = 42.
"Stems 3–6 dm from a short, stout rhizome, sparsely hirsutulous; basal lvs to 3 dm, with 3(5) principal lfls, the terminal one broadly obovate or subrotund, serrate, ± 3-lobed, the others adjacent, narrowly obovate; additional lateral lfls remote and irregular; cauline lvs much smaller, reduced above, variously toothed to divided; fls several, campanulate, nodding, the pedicels eventually elongate; sep purple, ascending or erect, 7–10 mm; bractlets linear, 3–4 mm; pet yellowish, suffused with purple and purple-veined, usually a little shorter than the sep; style at anthesis jointed near the middle, the distal segment plumose, to 8 mm at maturity; achenes spreading, with decurved styles; 2n=42. Swamps and wet meadows; Nf. and Que. to Alta., s. to N.J., Pa., Ind., Mich., and Calif. May– July. G. pulchrum Fernald, with clear yellow pet conspicuously exceeding the sep, has been thought to be a hybrid with G. macrophyllum, but may be merely a form of G. rivale."
30–60 cm hoch. Blätter ähnlich wie bei G. urbanum. Blüten nickend, erst zur Fruchtzeit aufgerichtet. Kelch purpurbraun, Kronblätter hellgelb, gegen den Rand rötlich, zusammenneigend, etwa gleich lang wie die Kelchblätter. Griffel wie
|Benoîte des ruisseaux||French||CH|
|Purple or water avens, chocolate-root, benoîte des ruisseaux|
|Cariofillata dei rivi||Italian||CH|