Flora of North America species comparison

ascending or sprawling, clustered, 10–50 cm, branched much of length, sericeous or glabrescent.

erect, ascending, procumbent, or trailing, often woody near base in herbs, usually branched, pubescent or glabrescent.

usually 2 sizes, axillary ones subtending racemes much smaller;

stipules subulate, 2.5–6 mm;

petiole (5–)10–15(–20) mm, longer than rachis;

leaflet blades elliptic to narrowly elliptic, apex obtuse or retuse, apiculate, surfaces sericeous abaxially, glabrous adaxially;

laterals similar to terminal, without oblique base;

terminal blade 10–30(–40) × 8–22 mm (6–10 mm in axillary leaves), length 1.4–2.5 times width.

alternate, trifoliolate, often larger on medial stems than those subtending inflorescences;

stipules present, usually persistent (caducous in L. texana), ciliate, striate-veined, apex acuminate; petiolate proximally, sessile or subsessile distally;

stipels absent;

leaflets 3, blade margins entire, ciliate, main lateral veins anastomosing before reaching margin, surfaces glabrous or pubescent;

lateral leaflets pulvinate, sessile or subsessile, blade often ± oblique;

terminal leaflet usually petiolulate (sometimes sessile in L. repens), usually larger than laterals.

slender, 4–7-flowered, flowers not clustered at apex, flowers chasmogamous and cleistogamous.

(1 or)2–40-flowered, axillary or appearing terminal due to reduction of subtending leaves, pseudoracemes, consisting of clusters of 2–4 flowers, rarely capitate, sometimes appearing paniclelike when subtending leaves reduced, cleistogamous flowers often in proximal fascicles, bracteolate;

bracts present, 1, subtending each flower cluster;

bracteoles 2, subtending each flower.

usually much longer than subtending leaves, sericeous.

0.5–3 mm, appressed-puberulent;

bracteoles shorter than calyx tube.

chasmogamous 6.5–9 mm;

calyx 4–6 mm, appressed-puberulent, tube 1–1.2 mm;

lobes 4, lateral narrowly triangular, 2.5–3 mm, adaxial connate proximally, apices acuminate;

corolla purple;

wings 5.5–6.5 mm;

keel 6–8 mm.

papilionaceous, chasmogamous or cleistogamous, chasmogamous pedicellate or subsessile, cleistogamous enclosed in calyx with reduced corolla;

calyx campanulate, lobes 4 or 5, often longer than tube, adaxial 2 distinct or proximally ± connate (and thus calyx 4-lobed), apex 2-toothed;

corolla pink to purple, lavender, magenta, reddish purple, or white to pale yellow;

banner broadly obovate to orbiculate, proximally clawed or cuneate, with inflexed auricles, darker purple marks (nectar guides) at throat of adaxial surface of lamina;

wings and keel long-clawed, lamina elliptic-oblong, proximally rounded;

stamens 10, diadelphous;

anthers dorsifixed (uniform);

disc present around base of ovary;

ovary minutely stipitate;

style adaxially incurved, slightly exserted from stamens;

stigma minute, terminal.

loments, usually subsessile, sometimes stipitate (sessile in L. procumbens), unilocular, strongly compressed laterally, indehiscent, papery, usually appressed-pubescent, sericeous, or villous;

loments from chasmogamous flowers usually subsessile, sometimes stipitate, usually elliptic-ovate or suborbicular to rounded, style straight;

loments from cleistogamous flowers sessile, usually crowded at base of peduncle, obovate to suborbicular, slightly smaller than chasmogamous, style curved and relatively short.

1, asymmetrical, ellipsoid or oblong, rim-arillate, chasmogamous seeds slightly longer or similar to cleistogamous.

chasmogamous as long as calyx, ovate to rounded, 5–7 mm, cleistogamous exserted from calyx, calyx 1/5 loment length, rounded, 4–5 mm;

stipe subsessile.

= 9, 10, 11.

= 20.