Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to southern Oregon, east to Newfoundland and Virginia,

Habitat: Marshes, bogs, wet meadows and standing water, lowlands to mountain valleys.

Flowers: July-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Sensitive in Washington (WANHP)

Edibility: EXTREMELY TOXIC EVEN IN SMALL AMOUNTS WHEN INGESTED BY HUMANS AND LIVESTOCK.

Pollination: Generalist

Slender, glabrous, usually single-stemmed perennials, 3-10 dm. tall, the stem not much thickened at the base and sometimes without thickened roots.

Leaves all cauline, the lower and middle ones dissected, with narrowly-linear, usually entire segments 0.5-4 cm. long and 0.5-1.5 mm. wide; the upper leaves reduced, with fewer segments or undivided, many of them bearing axillary bulbils.

Umbels frequently wanting, or present but not maturing fruit; umbels compound, the rays 1-2.5 cm. long, involucre wanting; involucel of several narrow bractlets; calyx teeth evident; petals 5, greenish-white.

Stylopodium depressed; fruit orbicular, glabrous, 1.5-2 mm. long, the ribs broader than the narrow intervals.

EXTREMELY TOXIC EVEN IN SMALL AMOUNTS WHEN INGESTED BY HUMANS AND LIVESTOCK.