Shrub 1-3 m; lvs ovate-elliptic, 4-7 cm, rounded at both ends; infls borne on branches of the previous year, ascending, 8-15 cm, leafless, floriferous for half their length or more, the component umbels separated by internodes to 2 cm. Rocky hills, Keweenaw Co., Mich.; Mont. to B.C. and Calif. June.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.