Cal-tube short, the narrow lobes subequal, or the 2 upper partly connate; standard suborbicular to oblong-ovate, short-clawed; wings oblong, straight, clawed and auriculate, connivent with the keel; keel-pet straight, blunt, obliquely obovate; stamens 10, equal, diadelphous; fr oval to elliptic, indehiscent, 1-seeded; herbs or shrubs with numerous small trifoliolate lvs and spicate, racemose or solitary, purple to ochroleucous fls in sessile or peduncled axillary infls, each fl subtended at base by 2 or 4 small bractlets; stipellules wanting; many spp. have both petaliferous and apetalous fls with similar or different frs. 25, widespread.
The following names are believed to be based on hybrids:
L. ءcuticarpa Mack. & Bush = L. violacea נvirginica
L. آrittonii E. P. Bicknell = L. procumbens נvirginica
L. بirta var. appressipilis S. F. Blake = L. angustifolia נhirta
L. جongifolia DC. = L. capitata נhirta
L. حanniana Mack. & Bush = L. capitata נviolacea
L. خeglecta Mack. & Bush = L. stuevei נvirginica
L. خuttallii Darl. = L. hirta נintermedia
L. دblongifolia (Britton) W. Stone = L. angustifolia נhirta
L. سimulata Mack. & Bush = L. capitata נvirginica
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.