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thin-petal larkspur, upland larkspur

doubtful knight's-spur

Habit Pubescent perennial from fleshy roots, the stems 1.5-4 dm. tall, usually single and simple. Annual herbs with slender taproots, the stems 3-8 dm. tall, glabrous to sparsely puberulent.
Leaves

Leaves few, long-petiolate, mostly basal, the blades 2-6 cm. broad, 2-4 times parted or lobed into linear or oblong-lanceolate segments 1.5-5 mm. broad;

cauline leaves much reduced upward.

Leaves alternate, all cauline, the lower petiolate, becoming nearly sessile upward;

leaves many, the blades orbiculate, 1-5 cm. wide, 12- to 60-lobed, the lobes under 1.5 mm. wide.

Flowers

Inflorescence simple or compound, the racemes 3-15 flowered; the lower pedicels several times as long as the flowers, spreading or ascending;

sepals 5, deep purplish-blue, widely spreading, 17-25 mm. long, the lower pair the largest; the spur 13-20 mm. long, from about as long to twice as long as the top sepal;

petals 4, small, the lower pair sometimes brownish or yellow-purplish, or all deep purplish-blue, the blade 3-4 mm. long, deeply bi-lobed;

stamens numerous;

pistils 3.

Inflorescence a terminal, 6-30 flowered raceme, simple or with 2-3 branches; pedicles spreading, 1-3 cm. long;

sepals 3, usually blue or purple, 8-18 mm. long, with a spur 12-20 mm. long, and with short, linear bracteoles at least 4 mm. below the sepals;

petals 2, united, 2-lobed, paler and smaller than the sepals;

stamens many, the filaments with the base enlarged;

style 1.

Fruits

Follicles 15-22 mm. long, somewhat spreading.

Follicles 12-25 mm. long, puberulent.

Comments

Specimen records from west of the Cascade Mountains need to be re-examined.

Delphinium nuttallianum

Delphinium ajacis

Flowering time March-August June-July
Habitat Dry, gravelly ground, sagebrush deserts to the ponderosa pine region in the mountains. Drainage ditches, roadsides, old home sites, waste areas.
Distribution
Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
[WildflowerSearch map]
[BONAP county map]
Limited in distribution to a few localities west of the Cascades in Washington; widely distributed throughout much of North America.
[WildflowerSearch map]
Origin Native Introduced
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. nuttallii, D. occidentale, D. stachydeum, D. sutherlandii, D. trolliifolium, D. viridescens, D. xantholeucum
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. trolliifolium, D. viridescens, D. xantholeucum
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