Flora of North America species comparison

puberulent.

flexuous.

stipules modified paired spines, white or gray, 0.2–2 cm, glabrous;

petiole/rachis 0.6–0.8 cm, densely lanate to glabrescent;

pinnae 2(–4), rarely with a terminal leaflet;

leaflets 10–18, opposite, 4–5 mm apart, blades elliptic-oblong, (4–)7–12 × 2–4 mm, base rounded or oblique, margins ciliolate, slightly 1–3-veined basally, apex rounded, obtuse, truncate, or mucronulate, surfaces tomentulose.

amentlike spikes, 4–6(–8) cm.

1–1.5 cm, lanate.

sepals 1 mm, finely tomentose;

petals connate 1/2 their lengths, yellow, red-tipped, 2–3 mm, pubescent;

stamens bright yellow;

filaments 3.5–4 mm, glabrous;

anthers 0.7–1 mm;

ovary stipitate, 1.5–2 mm, densely white-pilose;

style 2 mm, glabrous.

tan, reniform-ovoid, 3–3.5 mm.

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

plants produce only one or two fruits per inflorescence.

yellow-tan to dark brown (purple spotted), cylindric, coiled 2 or 3 times with 8–24 close-set spirals, 2.5–5.5 × 0.5–0.6 cm, puberulous to glabrescent.

= 56.