Flora of North America species comparison

prostrate to suberect, green to reddish, to 0.8 m, densely sericeous, ± hirsute, especially at nodes.

2.5–8.5 × 1–2.6 cm;

stipules 3–9 × 1–4 mm;

leaflets 12–16(–20), obliquely oblong to elliptic, largest 6–21 × 2.5–9 mm, densely sericeous when young, whitish abaxially.

longer than shorter pair of leaves, in flower (6–)19–35 mm, in fruit 11–34 mm, apex bent.

15–25 mm diam.;

sepals lanceolate, 5–9 × 1.5–3.5 mm, ciliate, densely strigose, silky-pubescent;

petals obovate-cuneate, (5.5–)7–17 × (3–)5–11 mm;

outer whorl of nectary glands green, inner whorl basally connate into 5-lobed urceolate ring surrounding base of ovary, yellow, broadly triangular, to 1 mm;

stamen filaments 2.5–5 mm;

anthers yellow, oblong-cordate to narrowly sagittate, 1–3 mm;

ovary 1.5–3 mm diam.;

style 5-ridged, cylindric, stout, 1–2 mm;

stigma globose to pyramidal.

8–10 mm diam. excluding 7 mm spines;

mericarps bearing 2 conic spreading 5–7 mm dorsal spines and sometimes 2 smaller retrorse spines near base [rarely spines absent and mericarps tuberculate, or spine 1], body green to gray, hispid, densely sericeous to strigose or glabrate.