PLANTS: Slender perennial herbs.
LEAVES: opposite with interposed stipules.
FLOWERS: 4-5-merous, in loose forking terminal cymes; corolla funnelform; ovary 2-loculed, each locule with 1 ovule.
FRUIT: splitting at maturity into 2 closed mericarps.
NOTES: 2 spp. w N. Amer. and China. (for Albert Kellogg).
REFERENCES: Terrell, Edward E. 1995 Rubiaceae. Houstonia. J. Ariz. - Nev. Acad. Sci. 29(l): 36.