Delphinium nuttallii subsp. nuttallii(synonym of Delphinium oreganum) |
Delphinium hesperium |
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Willamette Valley larkspur |
foothill larkspur, western larkspur |
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Stems | 40-70 cm. |
(11-)40-80(-120) cm; base usually reddish, longitudinally ridged, puberulent. |
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Leaves | blade round to pentagonal, 1-4 × 2-6 cm, usually puberulent, especially abaxially; ultimate lobes 3-14, width 3-8 mm (basal), 2-5 mm (cauline). |
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Inflorescences | (5-)15-30(-100)-flowered, moderately open; pedicel (0.5-)1-2.5(-7.5) cm, puberulent; bracteoles 2-6(-12) mm from flowers, green to blue, margins often white, linear-lanceolate, 3-7(-12) mm, puberulent. |
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Flowers | sepals blue or bluish purple, spurs 10-13 mm; lower petal blades 4.5-6.5 mm. |
sepals dark blue to white, puberulent, lateral sepals spreading, 7-13(-16) × 3-10 mm, spurs straight to upcurved, ascending 30-45° above horizontal, 9-18 mm; lower petal blades slightly elevated, ± exposing stamens, 3-8 mm, clefts 1-5 mm; hairs centered, denser on inner lobes near base of cleft, white. |
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Fruits | 8-18 mm, 2.2-3(-4.2) times longer than wide, sparse puberulent. |
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Seeds | not echinate, appearing ± smooth to naked eye; seed coat cells with margins straight, surfaces smooth or roughened. |
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2n | = 16. |
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Delphinium nuttallii subsp. nuttallii |
Delphinium hesperium |
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Phenology | Flowering late spring–early summer. | |||||||||
Habitat | Rock outcrops, rocky meadows | |||||||||
Elevation | 20-300 m (100-1000 ft) | |||||||||
Distribution |
OR; WA |
CA
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Discussion | Subspecies 3 (3 in the flora). Delphinium hesperium is thought to be poisonous to cattle (D. E. Moerman 1986, no subspecies specified). It is often confused with D. hansenii. See discussion under that species for distinguishing features. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 3. | FNA vol. 3. | ||||||||
Parent taxa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Grumosa > Delphinium nuttallii | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Echinata | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | unknown | A. Gray: Bot. Gaz. 12: 53. (1887) | ||||||||
Web links |