Linear bracts subtend the compound umbels

Tall, erect perennials with compound umbels of white flowers. Umbels measured to 8 cm diameter, a single umbellet measured to 12 mm diameter. Single flowers have 5 petals, measured at 3 mm diameter. Flowers fragrant. 5-10 bracts grow at base of umbels, deflexed, linear, measured at 12 mm long and 1 mm wide. Leaves alternate, reduced upwards, once-pinnate. Leaf highlighted in photo above was 33 cm long (including petiole) and 17 cm wide.Leaflets are sharply toothed, are stalkless, narrowly lanceolate, leaflet measured at 7 cm long by 1 cm wide. Plants glabrous.

Habitat is sloughs and marshes. Common.

Height is listed in Budd's Flora to 200 cm, we measured plants to 144 cm tall.

Photos taken July 28th, marsh in mixed woods, Porcupine Hills, about 500 km north east of our home in Regina, SK.

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