Delphinium exaltatum |
Delphinium distichum |
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tall larkspur |
Burke's larkspur, meadow larkspur, strict larkspur, two-spike larkspur |
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Stems | 70-200 cm; base reddish, nearly glabrous. |
(25-)30-60(-80) cm; base sometimes reddish, puberulent. |
Leaves | blade pentagonal, 2-7 × 3-9 cm, puberulent; ultimate lobes 3-7, width 5-25 mm; midcauline leaf lobes less than 3 times longer than wide. |
blade cuneate to semicircular, 1-5 × 1.5-7 cm, puberulent; ultimate lobes 5-19, width 2-8(-15) mm (basal), 0.5-3(-5) mm (cauline); margins of basal leaf, measured less than 1 cm from blade base, demarcating considerably more than 90° of arc when leaf laid flat; most cauline leaf blades exceeding internodes. |
Inflorescences | 8-30-flowered; pedicel 0.5-2 cm, puberulent; bracteoles 2-4 mm from flowers, green, linear, 2-4 mm, puberulent. |
8-30(-40)-flowered, usually dense; pedicel 0.5-1.5 cm, puberulent; bracteoles 0-3 mm from flowers, green to blue, linear, 4-8 mm, puberulent. |
Flowers | sepals whitish to pale lavender or purple, puberulent, lateral sepals forward pointing, 9-11 × 4-6 mm, spurs straight, as much as 45° above or below horizontal, 9-12 mm; lower petal blades ± covering stamens, 3-5 mm, clefts 1-2 mm; hairs centered, mostly near base of cleft, white. |
sepals dark blue to bluish purple, puberulent, lateral sepals ± erect, 8-12 × 3.5-5 mm, spurs straight, horizontal or nearly so, 9-15 mm; lower petal blades ± covering stamens, 4.5-6.5 mm, clefts 2-3 mm; hairs centered mostly near base of cleft, white. |
Fruits | 7-12 mm, 2-2.5 times longer than wide, ± puberulent. |
7-13 mm, 3.5-4 times longer than wide, ± puberulent. |
Seeds | ± wing-margined; seed coat cells elongate, surfaces smooth. |
seed coat cells with surfaces roughened. |
2n | = 16. |
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Delphinium exaltatum |
Delphinium distichum |
|
Phenology | Flowering summer. | Flowering late spring–early summer. |
Habitat | Rocky slopes in open deciduous woods and barrens, mainly on calcareous substrates, also shale and mafic and ultramafic rocks | Wet meadows |
Elevation | 150-2000 m (500-6600 ft) | 100-2400 m (300-7900 ft) |
Distribution |
AL; KY; MD; MO; NC; OH; PA; TN; VA; WV
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ID; MT; OR; WA; WY; BC
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Discussion | Delphinium distichum hybridizes with D. multiplex and D. nuttallianum (D. ×diversicolor Rydberg). The name D. burkei has often been misapplied to D. distichum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Exaltata | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Depauperata |
Sibling taxa | ||
Synonyms | D. strictum var. distichiflorum | |
Name authority | Aiton: Hort. Kew. 2: 244. (1789) | Geyer ex Hooker: J. Bot. 6: 68. (1847) |
Web links |
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