Our species are scrambling, sometimes tip-rooting shrubs, often supported by other vegetation, but capable of forming large, dense mounds.

1. Narrowed part (before flaring) of mature corolla tube about equaling or slightly exceeding the calyx tube (visible between the lobes, at least); calyx ca. 3.5-4.5 mm long.

L. barbarum

1. Narrowed part of mature corolla tube hidden in the calyx tube; calyx ca. 3-3.5 mm long.

L. chinense