Delphinium brachycentrum |
Delphinium nuttallii |
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arctic larkspur, northern larkspur |
Nuttall's larkspur, upland larkspur |
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Stems | 20-50(-80) cm; base often reddish, pubescent. |
20-60(-90) cm; base usually reddish, pubescent. |
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Leaves | blade round to pentagonal, 1.5-6 × 3-11 cm, puberulent; ultimate lobes 5-15, width 1-7(-15) mm. |
blade round to reniform, 2-8 × 3-14 cm, pubescent; ultimate lobes 5-18, width 4-7 mm (basal), 1-5 mm (cauline), widest at middle or in proximal 1/2. |
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Inflorescences | 5-18-flowered; pedicel 1-4.5 cm, pubescent; bracteoles 2-7 mm from flowers, blue, linear, 5-8 mm, puberulent. |
5-25(-40)-flowered, at least 2 times longer than wide; pedicel 1.5-4(-9) cm, puberulent; bracteoles 2-3 mm from flowers, green, linear, 4-6 mm, puberulent. |
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Flowers | sepals dark blue, apex rounded, puberulent, lateral sepals forward pointing, 17-24 × 7-9 mm, spurs straight to slightly decurved, ascending 30-60° above horizontal, 15-17 mm; lower petal blades ± covering stamens, 5-7 mm, clefts 0.5-1.5 mm; hairs sparse, local, centered, mostly above base of cleft, white. |
sepals bluish purple to yellowish, (± drab), often partly fading upon drying, puberulent, lateral sepals ± spreading, 8-11 × 3-6 mm, spurs straight, slightly ascending, 9-13 mm; lower petal blades ± covering stamens, 4-6 mm, clefts 0.5-2 mm; hairs well dispersed, mostly near margins and base of cleft, white to yellow or blue. |
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Fruits | 14-17 mm, 3.5-4 times longer than wide, pubescent. |
10-14(-18) mm, 3.5-4 times longer than wide, pubescent. |
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Seeds | wing-margined; seed coat cells ± elongate, surfaces roughened. |
wing-margined; seed coat cell surfaces smooth. |
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Delphinium brachycentrum |
Delphinium nuttallii |
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Phenology | Flowering summer. | |||||
Habitat | Well-drained tundra slopes | |||||
Elevation | 0-1600 m (0-5200 ft) | |||||
Distribution |
AK; YT; e Asia |
OR; WA
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Discussion | Hybrids with Delphinium glaucum are known as D. ×nutans A. Nelson. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 2 (2 in the flora). Delphinium nuttallii has often been confused with D. menziesii; it may be distinguished by consistently smaller flowers and usually more flowers per plant than in the latter. Interestingly, each species produces both blue-purple and yellowish flower colors, in separate populations. (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. Exaltata | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Grumosa | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | D. chamissonis | |||||
Name authority | Ledebour: Fl. Ross. 1: 60. (1841) | A. Gray: Bot. Gaz. 12: 54. (1887) | ||||
Web links |