Flora of North America species comparison

usually ascending to erect, sometimes prostrate to decumbent or spreading, not flagelliform, not rooting at nodes (except P. verna), lateral to persistent basal rosettes, 0.1–2(–3) dm, lengths 1–3(–4) times basal leaves.

erect, 0.1–0.5 dm, lengths 1–2 times leaves.

basal sometimes 2-ranked;

cauline 0–2(–3);

primary leaves ternate or palmate, (0.5–)1–12(–20) cm;

petiole: long hairs absent or spreading to ascending, weak to ± stiff, glands usually absent or sparse, sometimes abundant;

leaflets 3–7, at tip of leaf axis, overlapping or not, broadly oblanceolate or obtriangular to flabellate, margins flat to revolute, distal 1/4–3/4+ evenly to unevenly incised 1/4–1/2 to midvein, sometimes 3–5-lobed 1/2–3/4 to midvein as well, primary teeth (1–)2–5(–7) per side or per lobe, surfaces ± similar, abaxial pale to dark green, rarely grayish, brownish, or reddish, cottony hairs absent, adaxial green to dark green, rarely brownish or reddish, sometimes ± glaucous (P. grayi), long hairs (if present) soft to weak, sometimes stiff.

not in ranks, ternate, 0.5–2.5(–4) cm;

stipules: apex acute to obtuse;

petiole 0.2–1.8(–2.5) cm, long hairs ± sparse, ± spreading, 0.2–1 mm, weak, glands sparse to abundant;

leaflets 3, central obtriangular to flabellate, 0.5–0.7(–1) × 0.5–0.7 cm, petiolule 0–0.5 mm, margins flat, distal 3/4+ deeply 3–5-lobed (sinuses extending 2/3–3/4 to midvein), lobes unevenly incised 1/4–1/2 to midvein, teeth 1–3(–5) per lobe, surfaces similar, green, brownish, or reddish, hairs absent or sparse, 0.2–0.5 mm, glands sparse to common (also densely punctate-glandular).

1–6(–12)-flowered, ± cymose, ± to very open, or solitary flowers.

1-flowered.

usually straight in fruit (often recurved in P. verna), (0–)0.2–3(–9) cm, proximal usually not much longer than distal (sometimes longer in fruit).

straight or ± curved, 0–0.5(–2) cm in flower, to 5 cm in fruit.

5-merous;

hypanthium 2–7 mm diam.;

petals pale to dark yellow, mostly ± obcordate (to orbiculate in P. elegans), (2–)3–10(–12) mm, usually longer than sepals, apex usually ± retuse;

stamens ca. 20;

styles subapical, columnar, filiform, or tapered, not, scarcely, or ± papillate-swollen in proximal 1/5–1/2, 0.8–2.5 mm.

epicalyx bractlets linear, elliptic, or obovate, 2–2.2 × 0.8–1.1 mm, margins flat;

hypanthium 2.5–3.5 mm diam.;

sepals 2.2–2.5 mm, apex broadly acute to obtuse;

petals pale yellow, 3–3.5 × 3–3.5 mm;

filaments 1–1.5 mm, anthers 0.3–0.4 mm;

carpels 20–25, styles ± columnar, not papillate-swollen proximally, 0.7–0.9 mm.

± smooth.

1.2 mm.

= 14, 28 (Russian Far East).