Delphinium distichum |
Delphinium newtonianum |
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Burke's larkspur, meadow larkspur, strict larkspur, two-spike larkspur |
newton's larkspur, Ozark larkspur |
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Stems | (25-)30-60(-80) cm; base sometimes reddish, puberulent. |
40-90 cm; base often reddish, puberulent. |
Leaves | 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. |
blade round to pentagonal, 4-7 × 5-15 cm, nearly glabrous; ultimate lobes 3-7, width 8-20 mm (basal), 5-15 mm (cauline), widest at middle or in proximal 1/2. |
Inflorescences | 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. |
8-20(-40)-flowered, as wide as long or nearly so; pedicel 1-4(-6) cm, pubescent; bracteoles 6-15 mm from flowers, green, linear, 1.5-5 mm, puberulent. |
Flowers | 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. |
sepals dark to light blue, rarely white, glabrous, lateral sepals spreading, 12-14 × 6-7 mm, spurs straight to decurved, within 30° of horizontal, 10-15 mm; lower petal blades slightly elevated, ± exposing stamens, 4-5 mm, clefts 2-3 mm; hairs mostly centered near base of cleft, yellow. |
Fruits | 7-13 mm, 3.5-4 times longer than wide, ± puberulent. |
8-12 mm, 3-3.5 times longer than wide, nearly glabrous. |
Seeds | seed coat cells with surfaces roughened. |
unwinged; surface of each seed coat cell with swollen, blunt, hairlike structures, barely visible at 20x, otherwise smooth. |
2n | = 16. |
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Delphinium distichum |
Delphinium newtonianum |
|
Phenology | Flowering late spring–early summer. | Flowering early summer. |
Habitat | Wet meadows | Slopes in deciduous forest |
Elevation | 100-2400 m (300-7900 ft) | 500-700 m (1600-2300 ft) |
Distribution |
ID; MT; OR; WA; WY; BC
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AR |
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.) |
No cases of hybridization are known. Delphinium newtonianum often occurs in mixed populations with D. tricorne. It normally does not begin flowering until 4-6 weeks after D. tricorne has finished. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Depauperata | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Grumosa |
Sibling taxa | ||
Synonyms | D. strictum var. distichiflorum | |
Name authority | Geyer ex Hooker: J. Bot. 6: 68. (1847) | D. M. Moore: Rhodora 41: 196. (1939) |
Web links |
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