Flora of North America species comparison

erect, ± glandular, glabrate; unbranched or sparsely branched;

proximal nodes often with cataphylls.

to 75 cm, sparsely branched, glandular, puberulent to pubescent or, sometimes, glabrate;

proximal 1–9 nodes usually naked and with cataphylls, light brown, 5–7 mm, striate, puberulent.

alternate, odd-pinnate;

stipules present, deciduous or persistent, reflexed, distinct;

petiolate;

leaflets 3, very rarely 4, petiolulate, blade margins entire, surfaces glabrous or pubescent.

stipules tardily deciduous, light to dark brown, triangular or lanceolate to linear-spatulate, 4–10 × 0.5–2 mm, venation few;

petiole 1–4.6 cm, ribbed, base slightly to moderately swollen and different color and texture, sometimes slightly winged, glandular, minutely puberulent;

rachis 1.2–2.2 cm;

petiolules brown, 2–3.5 mm, sparsely glandular, brown-puberulent;

leaflet blades usually lanceolate, rarely rhombic to obovate, 3.5–6.5 × 2–3.7 cm, base attenuate, apex rounded to acute, surfaces abaxially less glandular and sparsely puberulent and with prominent veins, adaxially glandular and glabrous.

2 or 3 flowers per node (3–20 nodes), axillary, pseudoracemes;

bracts present, deciduous.

with 5–20 nodes, 2 or 3 flowers per node, ovoid;

rachis 1.5–4 cm, internodes 1.5–3 mm;

bracts usually late deciduous, caudate-lanceolate to oblanceolate, 3–7 × 1–2.5 mm, abaxially glandular, sparsely pubescent, hairs black.

5–9.5 cm.

present.

1.5–2 mm, at a node often subtended by very reduced, secondary bracts.

papilionaceous;

calyx tubular-campanulate (in bud), gibbous to campanulate (in fruit, concealing fruit), lobes 5, lobes equal to or less than tube;

corolla cream or yellow, sometimes with purple blotch on wing blades and keel petals;

banner bi-auriculate, wings auriculate, keel always shorter, apical margins connate;

stamens 10, monadelphous early with vexillary stamen becoming distinct;

anthers in 2 series, proximal ones dorsifixed, distal basifixed, introrse;

receptacle tumid, style reflexed.

13–15 mm;

calyx persistent (in fruit), broadly campanulate (in fruit), 9–10 mm, glandular and strigose, hairs white and/or black, tube stramineous-brown, 6 mm, lobes triangular, 2–3 mm;

corolla cream to light yellow, banner 14–15 mm;

filaments 10.5–12 mm;

anthers elliptic;

pistil 10–11.5 mm;

ovary sericeous, style base subsericeous.

legumes, sessile, elliptic or compressed-obovate, indehiscent, sometimes secondarily dehiscent by transverse rupture, apiculate or with beak ventrally displaced at maturity, eglandular or sparsely glandular, pubescent.

elliptic, 9–13 × 5–6 mm, beak broadly attached, triangular, to 3 mm, glandular, pubescent, hairs red-brown, short.

1, round to reniform, smooth.

red-brown, 6.5–7 × 3.5–4 mm.