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.

0.4–1.7 dm.

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.

ternate, (1.5–)2–6(–8) cm;

petiole 0.8–5(–7) cm, long hairs sparse to abundant, usually ± spreading, sometimes ascending, 0.5–1 mm, weak to ± stiff, glands sparse to common;

leaflets 3, central obovate-cuneate, (0.2–)0.5–1(–1.5) × 0.2–1 cm, scarcely petiolulate, distal 1/2–2/3 of margins evenly incised 1/3–1/2 to midvein, teeth (1–)2–3(–4) per side, surfaces green, long hairs sparse to common, 0.5–1 mm, glands sparse to abundant.

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

1–4-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).

0.5–2(–4) cm.

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 sometimes paired, narrowly elliptic, 1.5–2(–2.5) × 0.5–1 mm 1/2–3/4 as long as sepals;

hypanthium 2–3 mm diam.;

sepals 2.5–4 mm, apex broadly acute;

petals ± paler abaxially, bright yellow adaxially, ± obcordate to broadly obovate, (2–)3–4 × 2–3 mm;

filaments 1–1.5 mm, anthers 0.3–0.5 mm;

carpels 10–25, styles 1–1.5 mm.

± smooth.

1.3 mm, smooth to lightly rugose.

hairs not well differentiated from long hairs, absent or sparse throughout.