Flora of North America species comparison

erect to prostrate or sprawling, usually uncinulate-pubescent.

erect or ascending, usually much branched, sometimes woody at base, 20–100 cm, puberulent or pubescent, glabrescent.

alternate, usually unifoliolate, rarely odd-pinnate;

stipules present, persistent, striate, narrowly ovate, acuminate;

petiolate, petiole channeled, minutely winged;

leaflet(s) usually 1, rarely 3, stipels 2, minute, blade margins entire, surfaces usually pubescent, at least abaxial.

unifoliolate;

stipules 5–20 mm;

petiole 2–8 mm;

leaflet blades: proximals usually orbiculate, elliptic, or oblong, distals often lanceolate, 1–10 × 0.6–3 cm, base subcordate, apex acute to emarginate and mucronulate, abaxial surface finely puberulent, with some hairs on veins.

6–30+-flowered, usually leaf-opposed or terminal, sometimes axillary, usually racemes, sometimes panicles;

bracts present often conspicuous, striate, secondary bracts present;

bracteoles absent.

6–20-flowered, terminal or leaf-opposed, usually racemes, sometimes panicles, usually 5–15 cm.

1–2 mm.

papilionaceous;

calyx campanulate, sepals connate only near base, lobes 5, striate, subequal, adaxial 2 often connate nearly to apex;

corolla red to reddish blue, reddish violet, orange, orange-buff, pink, pinkish lavender, or white;

stamens 10, diadelphous;

anthers basifixed;

ovary sessile or shortly stipitate, style incurved at apex, glabrous, stigma terminal, slightly capitate.

calyx 5–6 mm, tube 1.5–2 mm, lobes valvate at base, narrowly triangular, 3–4 mm, acuminate;

corolla orange-buff to reddish violet or pink, 5–6 mm.

lax, internodes longer than 1/2 loment length.

loments, sessile, distal segment often abortive and stipelike, turgid or laterally compressed, straight or constricted, ovoid or oblong to linear, indehiscent, reticulate, sometimes also rugose, glabrescent or uncinate-puberulent;

segments 2–8.

2–8, oblong or 4-sided; scarcely rim-arillate.

brown, oblong, 2 × 1 mm.

subterete, oblong or linear, 10–25 × 2 mm, much longer than calyx, margins straight, not constricted between segments, uncinulate-puberulent;

segments (2–)4–6(–8), broadly oblong or quadrate, 2.5–4 mm, lateral surfaces coarsely reticulate, obscurely sculpted, ridged between segments, puberulent;

septa without internal cross partitions, except sometimes present at distal joints.

= (7), 8, [11].

= 16.