Delphinium distichum |
Delphinium umbraculorum |
|
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Burke's larkspur, meadow larkspur, strict larkspur, two-spike larkspur |
umbrella larkspur |
|
Stems | (25-)30-60(-80) cm; base sometimes reddish, puberulent. |
40-70(-90) cm; base often reddish, glabrous or 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, 1.5-4 × 2-6 cm, nearly glabrous; ultimate lobes 3-13, width 3-20 mm (basal), 1-8 mm (cauline). |
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. |
(5-)10-25(-45)-flowered, open, narrowly pyramidal; pedicel 0.5-3(-7) cm, glabrous to puberulent; bracteoles 3-7 mm from flowers, green, linear, 3-6 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 blue, puberulent, lateral sepals spreading, 9-16 × 4-7 mm, spurs gently upcurved, ascending 30-45° above horizontal, 8-14 mm; lower petal blades elevated, exposing stamens, 3.5-6 mm, clefts 0.5-1.5 mm; hairs densest near junction of blade and claw above base of cleft, centered or on inner lobes, white. |
Fruits | 7-13 mm, 3.5-4 times longer than wide, ± puberulent. |
9-16(-19) mm, 2.5-3(-4) times longer than wide, puberulent. |
Seeds | seed coat cells with surfaces roughened. |
seed coat cells brick-shaped, cell margins straight, surfaces smooth. |
2n | = 16. |
= 16. |
Delphinium distichum |
Delphinium umbraculorum |
|
Phenology | Flowering late spring–early summer. | Flowering late spring–early summer. |
Habitat | Wet meadows | Slopes in oak forests |
Elevation | 100-2400 m (300-7900 ft) | 400-1600 m (1300-5200 ft) |
Distribution |
ID; MT; OR; WA; WY; BC
|
CA
|
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.) |
Delphinium umbraculorum is most often confused with D. patens subsp. hepaticoideum; refer to discussion of that taxon for distinguishing features. Hybrids occur with D. parryi and D. patens subsp. montanum. (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. Subscaposa |
Sibling taxa | ||
Synonyms | D. strictum var. distichiflorum | |
Name authority | Geyer ex Hooker: J. Bot. 6: 68. (1847) | H. F. Lewis & Epling: Brittonia 8: 19. (1954) |
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