Delphinium distichum |
Delphinium treleasei |
|
---|---|---|
Burke's larkspur, meadow larkspur, strict larkspur, two-spike larkspur |
glade larkspur, Trelease's larkspur |
|
Stems | (25-)30-60(-80) cm; base sometimes reddish, puberulent. |
(40-)60-80(-110) cm; base reddish, glabrous, glaucous. |
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 reniform, 0.5-8 × 2-20 cm, glabrous; ultimate lobes 3-35(-56), 5 or more extending more than 3/5 distance to petiole, width 2-6 mm (basal), 0.5-2 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. |
5-30(-56)-flowered; pedicel (1-)2.5-7(-11) cm, glabrous; bracteoles 1-7(-46) mm from flowers, blue or green, awl-shaped, 1.5-4(-12) mm, glabrous. |
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 bright blue, usually retaining color upon drying, nearly glabrous, lateral sepals spreading, (10-)12-17(-20) × 4-8(-10) mm, spurs straight, ascending ca. 45°, 15-17 mm; lower petal blades ± covering stamens, 5-8 mm, clefts (1-)3-5 mm; hairs centered, densest above base of cleft, yellow. |
Fruits | 7-13 mm, 3.5-4 times longer than wide, ± puberulent. |
12-18(-22) mm, 3-4 times longer than wide, glabrous. |
Seeds | seed coat cells with surfaces roughened. |
unwinged; seed coat cell surfaces smooth. |
2n | = 16. |
= 16. |
Delphinium distichum |
Delphinium treleasei |
|
Phenology | Flowering late spring–early summer. | Flowering late spring. |
Habitat | Wet meadows | Open juniper glades on calcareous substrate |
Elevation | 100-2400 m (300-7900 ft) | 250-450 m (800-1500 ft) |
Distribution |
ID; MT; OR; WA; WY; BC
|
AR; MO |
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 treleasei is locally abundant but extremely limited by microhabitat within its distributional range. Hybrids between Delphinium treleasei and D. carolinianum subsp. carolinianum are known. (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) | Bush ex K. C. Davis: Minnesota Bot. Stud. 2: 444. (1900) |
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