Delphinium nuttallianum |
Delphinium ajacis |
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thin-petal larkspur, upland larkspur |
doubtful knight's-spur |
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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. |
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Delphinium nuttallianum |
Delphinium ajacis |
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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.
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Limited in distribution to a few localities west of the Cascades in Washington; widely distributed throughout much of North America.
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Origin | Native | Introduced |
Conservation status | Not of concern | Not of concern |
Sibling taxa | ||
Web links |
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