Cor funnelform, irregular, the upper side evidently the longer, the lobes unequal; fornices wanting, the throat open; filaments slender, ±unequal, some or all strongly exsert; gynobase flat or nearly so; nutlets ±roughened, attached at base, the large scar sometimes surrounded by a low rim; style exsert; annual to perennial herbs or subshrubs with blue to purple or red (white) fls in a series of helicoid, bracteate cymes. 50, Old World.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.