Flora of North America species comparison

glabrous, gland-dotted.

distinctly flexuous.

stipules modified paired spines, decurrent, white, 0.1–2 cm, glabrous;

petiole/rachis 1.5–4.5 cm;

pinnae 2;

leaflets 6–16, usually alternate, rarely opposite, 3.5–5 mm apart, blades gray-green, oblong, 2–9 × 0.8–2 mm, base rounded to oblique, margins sparsely ciliate, enervate or slightly 1–3-veined, apex obtuse, surfaces glaucous, puberulous, or glabrescent.

globose heads, 1.5 cm.

1.5–6 cm, glabrescent.

sepals 1.5–2.2 mm, puberulous;

petals mostly connate, yellow, 3–4 mm, lobes 1 mm, villous adaxially;

stamens yellow;

filaments 4–5 mm, glabrous;

anthers 1.5 mm;

ovary short-stipitate, 1.5 mm, sparsely villous;

style 1.5–2 mm, glabrous.

gray-green, ovoid, 4.5–5.4 mm.

ruiziana Burkart (found in Argentina) has fruits to 2 cm longer than var. strombulifera;

plants produce only one or two fruits per inflorescence.

lemon yellow to yellow-tan, cylindric, coiled (8–17 coils), 1.8–5.2 × 0.6–1 cm, puberulous when young.