Delphinium basalticum |
Delphinium geyeri |
|
---|---|---|
basalt larkspur, basaltic larkspur, Columbia Gorge larkspur |
Geyer's larkspur, poisonweed |
|
Stems | 20-50(-65) cm; base often reddish, puberulent. |
(15-)30-60(-80) cm; base usually reddish, puberulent. |
Leaves | blade round, 2-6 × 5-9 cm, not succulent, nearly glabrous; ultimate lobes 5-19, width 3-15 mm (basal), 1-12 mm (cauline). |
blade light green, ± round, 1-5 × 1-6 cm, densely pubescent; ultimate lobes 7-20, width 2-5 mm (basal), 2-4 mm (cauline), apex gradually tapering to point; veins obscure. |
Inflorescences | (2-)6-16(-26)-flowered; pedicel 2-7 cm, nearly glabrous; bracteoles 4-12 mm from flowers, green, linear, 3-7 mm, nearly glabrous. |
6-30(-60)-flowered, ± open, cylindric; pedicel ascending to spreading, 1-3(-4) cm, puberulent; bracteoles 1-3 mm from flowers, green, lanceolate, 3-6 mm, puberulent. |
Flowers | sepals dark blue, nearly glabrous, lateral sepals spreading, 15-21 × 7-10 mm, spur straight to decurved, ascending 30-45° above horizontal, 14-18 mm; lower petal blades slightly elevated, ± exposing stamens, 7-9 mm, cleft 4-5 mm; hairs centered, mostly on inner lobes above base of cleft, yellow to white. |
sepals bright blue, puberulent, lateral sepals spreading, 10-18 × 4-8 mm, spurs straight to slightly downcurved, ascending 0-30°, 11-16 mm; lower petal blades slightly elevated, ± exposing stamens, 4-8 mm, clefts 0.5-2 mm; hairs centered, densest on inner lobes near base of cleft, white to light yellow. |
Fruits | 12-17 mm, 3.5-4 times longer than wide, glabrous. |
11-15 mm, 3-3.5 times longer than wide, sparse puberulent. |
Seeds | ± wing-margined; seed coat cells with surfaces smooth. |
unwinged; seed coat cells with margins straight, surfaces ± roughened. |
2n | = 16. |
|
Delphinium basalticum |
Delphinium geyeri |
|
Phenology | Flowering spring (-early summer). | Flowering late spring–early summer. |
Habitat | Basaltic cliff faces, n and e slopes at base of cliffs | Grasslands or Artemisia-Cercocarpus scrub |
Elevation | 200-500 m (700-1600 ft) | 1400-3000 m (4600-9800 ft) |
Distribution |
OR; WA |
CO; MT; NE; UT; WY
|
Discussion | Of conservation concern. Hybrids between Delphinium basalticum and D. trolliifolium are known. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Apparently closely related to Delphinium stachydeum, D. geyeri is generally smaller, earlier flowering, with more finely dissected leaves and a more eastern geographic distribution. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Bicoloria | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Wislizenana |
Sibling taxa | ||
Name authority | M. J. Warnock: Phytologia 78: 91. (1995) | Greene: Erythea 2: 189. (1894) |
Web links |