Delphinium bicolor |
Delphinium nuttallianum |
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Flathead larkspur, little larkspur, low larkspur, Montana larkspur |
dwarf, meadow, Nuttall's larkspur, or Sonne's larkspur, slim, thin-petal larkspur, two-lobe larkspur, upland larkspur |
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Stems | 10-40(-70) cm; base often reddish, glabrous to puberulent. |
unbranched, 10-40(-70) cm; base reddish, pubescence variable. |
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Leaves | blade round, 1-4 × 1.5-7 cm, glabrous to puberulent; ultimate lobes 3-19, width 1-8 mm (basal), 1-3 mm (cauline). |
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. |
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Inflorescences | 3-12(-22)-flowered; pedicel 1-4(-8) cm, ± puberulent; bracteoles 2-7(-17) mm from flowers, green, sometimes white-margined, lanceolate, 4-6(-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. |
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Flowers | sepals dark blue, puberulent, lateral sepals usually spreading, 16-21 × 6-12 mm, spurs straight to gently decurved, ascending 0-40° above horizontal, 13-23 mm; lower petal blades covering stamens, 7-12 mm, clefts 0.1-3 mm; hairs sparse, short, mostly on inner lobes below junction of blade and claw, white or yellow. |
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. |
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Fruits | (12-)16-22 mm, 4-4.5 times longer than wide, usually puberulent. |
7-22 mm, 3.5-5 times longer than wide, glabrous to puberulent. |
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Seeds | often winged; seed coat cells with surfaces ± smooth. |
winged or not; seed coat cell surfaces smooth or roughened, blunt hairs absent. |
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2n | = 16. |
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Delphinium bicolor |
Delphinium nuttallianum |
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Phenology | Flowering spring (-early summer). | |||||
Habitat | Open coniferous woods, grassy sage scrub, meadow edges and well drained streamsides (generally not in very wet sites) | |||||
Elevation | 300-3500 m (1000-11500 ft) | |||||
Distribution |
ID; MT; ND; NE; SD; WY; AB; BC; SK
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AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; BC
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Discussion | Subspecies 2 (2 in the flora). Delphinium bicolor is closely related to D. glareosum; it differs in its wider-lobed cauline leaves, shallower petal clefts, and narrower fruits. The Gosiute consider this plant to be poisonous (D. E. Moerman 1986, subspecies not specified). (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.) |
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Key |
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Source | FNA vol. 3. | FNA vol. 3. | ||||
Parent taxa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Bicoloria | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Grumosa | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | D. pauciflorum, D. nuttallianum var. fulvum, D. nuttallianum var. levicaule, D. sonnei | |||||
Name authority | Nuttall: J. Acad. Nat. Sci. Philadelphia 7: 10. (1834) | Pritzel: in Walpers, Repert. Bot. Syst. 1: 744. (1842) | ||||
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