Erect perennial, with single stems or branching growth habit. Foliage is bluish green, leaves alternate, linear-oblong, and in a whorl beneath the infloresence. I measured stem leaves to 7 cm long and 5 mm wide. Flowers in in a terminal umbel, and from umbels growing from upper leaf axils. Flowers fragrant. Plant glabrous.
Invasive, introduced weed, commonly found now on sandy soils in Saskatchewan.
Height listed in Budd's Flora from 15 to 75 cm, I measured plants to 110 cm tall.
Took the above photos in July 17th and 25th, sandy meadow and aspen woods, 30 km east of our home in Regina, SK.