Delphinium distichum |
Delphinium geraniifolium |
|
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Burke's larkspur, meadow larkspur, strict larkspur, two-spike larkspur |
Clark Valley larkspur, Mogollon larkspur |
|
Stems | (25-)30-60(-80) cm; base sometimes reddish, puberulent. |
60-100 cm; base reddish, puberulent, midstems pubescent. |
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 dark green, at least adaxially, fan-shaped to reniform, 2-5 × 3-7 cm, pubescent, especially abaxially; ultimate lobes 5-15, width 4-15 mm (basal lobes 5-15 mm), apex abruptly tapered, usually mucronate; veins prominent. |
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. |
20-90-flowered, dense, cylindric; pedicel ascending to spreading, 1-2 cm, puberulent; bracteoles 1-2 mm from flowers, green, linear, 4-6 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 to purple, puberulent, lateral sepals spreading to slightly forward pointing, 10-14 × 3-5 mm, spurs ascending 20-70°, truncate or downcurved apically, 12-15 mm; lower petal blades slightly elevated, ± exposing stamens, 4-6 mm, clefts 0.5-2 mm; hairs sparse, local below junction of blade and claw, scattered on margins, white. |
Fruits | 7-13 mm, 3.5-4 times longer than wide, ± puberulent. |
13-18 mm, 3-3.5 times longer than wide, puberulent. |
Seeds | seed coat cells with surfaces roughened. |
unwinged; seed coat cells with margins straight, surfaces ± roughened. |
2n | = 16. |
= 16. |
Delphinium distichum |
Delphinium geraniifolium |
|
Phenology | Flowering late spring–early summer. | Flowering summer. |
Habitat | Wet meadows | Heavy clay soil, dry meadows in coniferous woods |
Elevation | 100-2400 m (300-7900 ft) | 1800-3400 m (5900-11200 ft) |
Distribution |
ID; MT; OR; WA; WY; BC
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AZ; NM
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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.) |
Delphinium geraniifolium is a more pubescent analog of the closely related D. scopulorum, the former occurring in heavier soils at higher elvation. (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. Wislizenana |
Sibling taxa | ||
Synonyms | D. strictum var. distichiflorum | D. tenuisectum subsp. amplibracteatum |
Name authority | Geyer ex Hooker: J. Bot. 6: 68. (1847) | Rydberg: Bull. Torrey Bot. Club 26: 583. (1899) |
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