Burke: Delphinium trolliifolium vs. Delphinium glaucum

	Delphinium trolliifolium	Delphinium glaucum
	cow-poison, poison larkspur	pale larkspur
Habit	Stout perennial from short, thick rhizomes, the several erect stems 7-15 dm. tall, simple below the inflorescence, hollow, glabrous to sparsely hairy.	Stout, glabrous and glaucous perennial from thick rhizomes, the several simple, hollow stems 10-20 dm. tall.
Leaves	Leaves numerous, evenly spaced and gradually reduced upward, the blades of the lower ones 10-20 cm. broad, tri-lobed nearly to the base, the 2 lateral lobes deeply divided into 2-3 segments, the segments broadly wedge-shaped and 2-3 times deeply toothed.	Leaves numerous, gradually reduced upward, all divided over half their length into five broad, wedge-shaped segments, these sharply 2-3 times toothed; the blades of the lower leaves may be 15-20 cm. broad.
Flowers	Inflorescence elongate and loose, the raceme usually simple, pubescent with spreading, yellowish hairs, leafy-bracteate below; pedicels considerably exceeding the sepal spur, spreading; sepals 5, deep blue, oblong-lanceolate and pointed, 18-25 mm. long, the spur straight, about equal to the blade of the upper sepal; petals 4, small, the lower pair colored as the sepals, the upper pair white; stamens numerous; pistils 3.	Inflorescence a simple or compound raceme, rather elongate and loosely many-flowered; sepals 5, deep blue-purple, oblong-elliptic, 6-12 mm. long, the spur straight, shorter than the blade of the upper sepal; petals 4, small, pale blue; stamens numerous; pistils 3.
Fruits	Follicles glabrous, about 15 mm. long.	Follicles erect, 10-14 mm. long, glabrous.

	Delphinium trolliifolium	Delphinium glaucum
Flowering time	April-May	July-September
Habitat	Moist, shady woods at low to middle elevations.	Meadows and wet thickets, bogs, streambanks, and coniferous forest openings at middle elevations in the mountains.
Distribution	Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; Washington south to California. [WildflowerSearch map] [BONAP county map]	Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and the Canadian Great Plains. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	D. ajacis, D. basalticum, D. ×burkei, D. depauperatum, D. distichum, D. glareosum, D. glaucum, D. leucophaeum, D. lineapetalum, D. menziesii, D. multiplex, D. nuttallianum, D. nuttallii, D. occidentale, D. stachydeum, D. sutherlandii, D. viridescens, D. xantholeucum	D. ajacis, D. basalticum, D. ×burkei, D. depauperatum, D. distichum, D. glareosum, D. leucophaeum, D. lineapetalum, D. menziesii, D. multiplex, D. nuttallianum, D. nuttallii, D. occidentale, D. stachydeum, D. sutherlandii, D. trolliifolium, D. viridescens, D. xantholeucum
Web links	Local floras: CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Delphinium glaucum

cow-poison, poison larkspur

pale larkspur

Habit

Stout perennial from short, thick rhizomes, the several erect stems 7-15 dm. tall, simple below the inflorescence, hollow, glabrous to sparsely hairy.

Stout, glabrous and glaucous perennial from thick rhizomes, the several simple, hollow stems 10-20 dm. tall.

Leaves

Leaves numerous, evenly spaced and gradually reduced upward, the blades of the lower ones 10-20 cm. broad, tri-lobed nearly to the base, the 2 lateral lobes deeply divided into 2-3 segments, the segments broadly wedge-shaped and 2-3 times deeply toothed.

Leaves numerous, gradually reduced upward, all divided over half their length into five broad, wedge-shaped segments, these sharply 2-3 times toothed; the blades of the lower leaves may be 15-20 cm. broad.

Flowers

Inflorescence elongate and loose, the raceme usually simple, pubescent with spreading, yellowish hairs, leafy-bracteate below;

pedicels considerably exceeding the sepal spur, spreading;

sepals 5, deep blue, oblong-lanceolate and pointed, 18-25 mm. long, the spur straight, about equal to the blade of the upper sepal;

petals 4, small, the lower pair colored as the sepals, the upper pair white;

stamens numerous;

pistils 3.

Inflorescence a simple or compound raceme, rather elongate and loosely many-flowered;

sepals 5, deep blue-purple, oblong-elliptic, 6-12 mm. long, the spur straight, shorter than the blade of the upper sepal;

petals 4, small, pale blue;

stamens numerous;

pistils 3.