PLANTS: Perennial herbs, lacking milky juice.

STEMS: erect from a branched caudex.

LEAVES: opposite, ovate to suborbicular.

INFLORESCENCE: axillary.

FLOWERS: calyx the lobes equal; corolla funnelform; stamens born near the base of the corolla tube, the anthers connivent and sagittate.

FRUIT: a pair of follicles.

SEEDS: comose at the apex.

NOTES: 1 sp. in AZ, CA, UT. (Greek: kyklos = ring + aden = gland, referring to a perigynous, nectariferous disk).

REFERENCES: McLaughlin, Steven, P. 1994. Apocynaceae. J. Ariz. - Nev. Acad. Sci. Volume 27, 164-168.