Flora of North America species comparison

procumbent or prostrate, branches often zigzag.

1.5–4.5 cm;

stipules to 2 times as long as wide;

petiole (1–)1.5–5.5(–10) mm;

extrafloral nectary 1 or 2, sessile and concealed in petiolar sulcus or shortly stipitate;

leaflets 9–21(–25) pairs, blades linear-oblong, -oblanceolate, or oblong-elliptic, 1–8.5 × 0.4–2.1(–2.5) mm.

1 or 2(or 3)-flowered, axillary.

20–42 mm;

bracteoles shortly proximal to calyx.

calyx red-brown, sepal venation reticulate;

corolla bright yellow, petals to 10.5–16 mm;

stamens 10;

anthers yellow, to 4.5–8.5(–9) mm;

ovary gray-hairy.

straight or slightly curved, linear-oblong, 25–70 × 3.5–5 mm.

3–3.9 mm.

flexuosa tends to have larger leaves (4–14 cm) with more leaflet pairs (usually 25–65, rarely as few as 20).

= 16.