Delphinium trolliifolium A. Gray
Columbian Larkspur, Cow Poison
Ranunculaceae (Buttercup Family)
USDA Symbol: DETR2
A stately plant with stout, hollow, leafy, generally tall stems and bilaterally symmetrical, deep purplish-blue flowers in long loose racemes; upper stems and flower stalks commonly covered with minute, yellowish hairs.
This handsome native species is common in wet parts of the Northwest. Members of the genus Delphinium are known as both delphinium and larkspur. Gardeners generally call the tall, perennial species delphinium and the smaller, annual species larkspur. Botanists usually call all species delphinium. Cattle ranchers, who despise the plants because of their toxicity to livestock, call all species larkspur.
From the Image Gallery
Bloom InformationBloom Time: Apr , May , Jun
DistributionUSA: CA , OR
Native Distribution: Southern Washington south to northern California.
Native Habitat: Moist shady woods and wet banks.
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Native Seed Network - Corvallis, OR
Additional resourcesUSDA: Find Delphinium trolliifolium in USDA Plants
FNA: Find Delphinium trolliifolium in the Flora of North America (if available)
Google: Search Google for Delphinium trolliifolium
MetadataRecord Modified: 2007-01-01
Research By: TWC Staff