Flora of North America species comparison

herbaceous, erect or spreading, much branched, to 6 dm, glabrous, puberulent, or densely hispid.

prostrate to erect or ascending, sometimes viscid, pubescent or glabrous.

stipular sheath 8–15-veined, glabrous or puberulent to densely hispid, teeth of distal stipules mostly shorter than sheath;

petiole 1–3 mm;

leaflet blades ovate to elliptic or lanceolate, 40–20 mm, veins 3–6 pairs, base cuneate, margins sometimes spinulose, apex acute to acuminate, surfaces sometimes punctate abaxially, glabrous.

alternate, odd-pinnate;

stipules present, foliaceous, amplexicaul, adnate to petiole for most of its length; petiolate;

leaflets 3, blade margins entire, surfaces glandular-punctate or epunctate, sometimes black-punctate, glabrous or pubescent.

1–8-flowered, ovoid, to 1 cm, axis rudiment absent;

bracts usually 1-foliolate, sometimes 3-foliolate proximally, 3–6 × 2.5–5.5 mm, 5–9-veined, puberulent to densely hispid;

outer bracteole 2–3 mm, apex glabrous or ciliate;

inner bracteole 1, 1–2.5 mm, apex glabrous or ciliate.

1–15+-flowered, terminal or axillary, spikes or solitary flowers, erect, axis rudiment (aborted floral axis) sometimes present;

bracts present, persistent, foliaceous;

bracteoles persistent, 1 outer, 1 or 2 inner.

calyx tube 2.5–5 mm, lobes ± acute;

corolla yellow or orange-yellow;

banner suborbiculate, 4.5–7 mm;

wings 3.5–4.5 mm;

keel 3–4 mm.

papilionaceous;

calyx tubular, lobes 5, unequal, adaxial 4-lobed;

corolla yellow or orange-yellow, inserted near apex of calyx tube;

petals evenly graduated;

wings shorter and narrower than banner, not adnate to keel, clawed, auriculate;

keel incurved or rostrate;

stamens 10, monadelphous;

anthers dimorphic, 5 versatile anthers alternating with 5 sub-basifixed;

ovary subsessile;

style curved, glabrous or pubescent.

loments, sessile or stipitate, tan or brown, compressed, articulate, ovate, individual segments indehiscent, glabrous or pubescent;

segments 2, breaking apart, proximal segment fertile or abortive, densely pubescent, distal segment fertile, reticulate;

style persistent as a beak, beak erect, declined, or coiled.

1–1.5 mm.

1 or 2, black, compressed, ovoid, shiny.

strongly reticulate with vertical veins, 2.5–3 mm wide;

fertile segment 1;

proximal segment sterile;

distal segment 2.5–5 mm, puberulent;

beak hooked, 0.5–1 mm, to 1/5 distal segment.

= 10.