Delphinium brachycentrum |
Delphinium nuttallianum |
|
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arctic larkspur, northern larkspur |
dwarf, meadow, Nuttall's larkspur, or Sonne's larkspur, slim, thin-petal larkspur, two-lobe larkspur, upland larkspur |
|
Stems | 20-50(-80) cm; base often reddish, pubescent. |
unbranched, 10-40(-70) cm; base reddish, pubescence variable. |
Leaves | blade round to pentagonal, 1.5-6 × 3-11 cm, puberulent; ultimate lobes 5-15, width 1-7(-15) mm. |
blade round, 1-6 × 2-12 cm, nearly glabrous; ultimate lobes 5-21, 5 or more extending more than 3/5 distance to petiole, width 1-7(-14) mm (basal), 0.5-6 mm (cauline), widest at middle or in proximal 1/2. |
Inflorescences | 5-18-flowered; pedicel 1-4.5 cm, pubescent; bracteoles 2-7 mm from flowers, blue, linear, 5-8 mm, puberulent. |
4-18(-48)-flowered, at least 2 times as long as wide; pedicel 0.8-6 cm, pubescence variable; bracteoles 3-8(-18) mm from flowers, green to blue, linear, 3-7 mm, pubescence variable. |
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 usually bluish purple, rarely white to pink, puberulent, lateral sepals reflexed or spreading, 8-21 × 3-10 mm, spurs decurved to straight, ascending 20-60° above horizontal, 8-23 mm; lower petal blades elevated, exposing stamens, blue to purple, except sometimes in white-flowered plants, 4-11 mm, clefts 2-5 mm; hairs mostly on inner lobes below junction of blade and claw, white, rarely yellow. |
Fruits | 14-17 mm, 3.5-4 times longer than wide, pubescent. |
7-22 mm, 3.5-5 times longer than wide, glabrous to puberulent. |
Seeds | wing-margined; seed coat cells ± elongate, surfaces roughened. |
winged or not; seed coat cell surfaces smooth or roughened, blunt hairs absent. |
2n | = 16. |
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Delphinium brachycentrum |
Delphinium nuttallianum |
|
Phenology | Flowering summer. | Flowering spring (-early summer). |
Habitat | Well-drained tundra slopes | Open coniferous woods, grassy sage scrub, meadow edges and well drained streamsides (generally not in very wet sites) |
Elevation | 0-1600 m (0-5200 ft) | 300-3500 m (1000-11500 ft) |
Distribution |
AK; YT; e Asia |
AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; BC
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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.) |
Delphinium nuttallianum represents an extremely difficult complex, with many variations in a number of morphologic traits. The complex has been and continues to be a major source of confusion for identification of Delphinium in North America. Type specimens of D. nuttallianum represent plants growing under dry conditions in open areas. These are typically found at 1200-2000 m in sage scrub or lower montane forest. Delphinium nuttallianum may be confused with D. andersonii, D. antoninum, D. depauperatum, D. gracilentum, and two subspecies of D. patens (subsp. patens and subsp. montanum). Features that may be used to separate D. nuttallianum from the first four, are enumerated under the respective species discussions. From D. patens subsp. patens, D. nuttallianum may be distinguished by its narrower leaf lobes, larger fruits, and more compact inflorescence. The frequent presence of glandular hairs in the inflorescence of D. patens subsp. montanum, contrasted with their absence in D. nuttallianum, will separate these taxa. Dwarfed plants of D. polycladon may be confused with D. nuttallianum. The latter, however may be distinguished by its ringed seeds, and it does not have prominent buds or sigmoid pedicel. Hybrids have been seen between Delphinium nuttallianum and D. andersonii, D. depauperatum (D. ×burkei Greene), D. distichum (D. ×diversicolor Rydberg), D. nudicaule, and D. polycladon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Exaltata | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Grumosa |
Sibling taxa | ||
Synonyms | D. chamissonis | D. pauciflorum, D. nuttallianum var. fulvum, D. nuttallianum var. levicaule, D. sonnei |
Name authority | Ledebour: Fl. Ross. 1: 60. (1841) | Pritzel: in Walpers, Repert. Bot. Syst. 1: 744. (1842) |
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