Flora of North America species comparison

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

herbaceous, erect, branched from near base, to 5 dm, often minutely pubescent along one side, sometimes glabrous, rarely pubescent throughout.

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.

stipular sheath 7-veined, glabrous or puberulent, teeth of distal stipules mostly longer than sheath;

petiole 2–4 mm;

leaflet blades lanceolate to ovate, 150 × 80 mm, veins 3–5 pairs, base cuneate, margins rarely ciliate, apex acute to acuminate, surfaces glabrous.

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.

2+-flowered, narrowly oblong or ovoid, to 1.5 cm, axis rudiment present, to 5 mm;

bracts 1-foliolate, averaging 4 mm wide, 5–7-veined, margins ciliate and often bristly abaxially;

outer bracteole 1–3 mm, apex ciliate;

inner bracteoles 2, 2–2.5 mm, apex ciliate.

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.

calyx tube 3–4 mm, lobes acute;

corolla yellow;

banner obovate, 4.5–6 mm;

wings 4–5 mm;

keel 3.5–4.5 mm.

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 or 2, black, compressed, ovoid, shiny.

1–2 mm.

conspicuously reticulate, 1.5–2 mm wide;

fertile segments (1 or)2;

proximal segment 2–2.5 mm;

distal segment 2.5–3 mm, usually densely white-hairy, sometimes glabrate;

beak straight or slightly curved, 1.5–2.5 mm, 1/2 to equaling distal segment, with short, white hairs or glabrous.

= 10.

= 20.