Like L. juncea but more slender and more branched. Leaves linear, 5-6 cm long, 1-2 mm wide, rather crowded near the base, more distant above, the upper 1-1.3 cm long and 1 mm wide. Flowers in a lax, often secund, raceme-like group, on slender ascending pedicels 0.5-2 cm long. Pedicels with 2 small bracts, occasionally with axillary flowers. Calyx lobes triangular, acute, 1-2 mm long, ciliate, not obviously connate. Corolla 0.8-1.2 cm long, the tube 0.3 cm long, longer than the calyx lobes. Ovary narrow, 3-4 mm long. Fruit as in L. juncea but up to 1.8 cm long: valves obtuse, shorter than the calyx lobes.