Flora of North America species comparison

horizontal, thin, 2.5–3 mm wide, internodes 3–7 cm;

root tubers absent.

glabrous.

basal 1 or 2, deciduous by flowering;

stipules ovate to elliptic, 1–1.5 cm, base auriculate;

lateral leaflets in 1–5 pairs, remote, ovate to elliptic, to 9 cm, palmately 2–3-lobed, lobes lanceolate, margins serrate or doubly serrate;

terminal leaflets round, 10–15 cm diam., palmately 7–9-lobed, lobes oblanceolate to lanceolate, margins doubly serrate, apex acute to acuminate, surfaces hairy at least on veins, hairs appressed, straight, short, 0.5 mm, or adaxial glabrous.

alternate, pinnately compound;

stipules persistent, free or adnate to petiole;

venation pinnate to nearly palmate basally.

100+-flowered;

branches and pedicels glabrous.

hypanthium slightly concave;

sepals (4–)5(–6), purplish, spatulate to triangular, 1–3 mm, margins without midrib, abaxially glabrous, adaxially finely appressed-hairy or glabrous;

petals (4–)5(–6), pink to purple, orbiculate, 2.5–7 mm, claws distinct, short, base narrow, margins unevenly toothed;

stamens pink to purplish, about equal to or longer than petals.

perianth and androecium perigynous;

epicalyx bractlets absent;

hypanthium flat to concave;

torus inconspicuous, sometimes enlarged in fruit;

carpels 5–12, distinct, free, styles terminal to subterminal, distinct;

ovules 2, apical, superposed.

aggregated achenes;

styles persistent, not elongate.

3–7, flattened, oblanceolate, straight, 8–14 mm, glabrous;

stipes 0.5–1.5 mm;

styles 1–2 mm.