Delphinium uliginosum |
Delphinium stachydeum |
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swamp larkspur |
hedgenettle larkspur, Rocky Mountain larkspur, spike larkspur, Umatilla larkspur |
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Stems | 10-30(-70) cm; base reddish or not, nearly glabrous. |
(40-)70-150(-200) cm; base reddish, puberulent. |
Leaves | blade obdeltoid, apically several parted, 1-8 × 1-7 cm, ± fleshy, glabrous; ultimate lobes 0-3, width 3-20 mm (cauline only); margins of basal leaf, measured less than 1 cm from blade base, demarcating less than 90° of arc when leaf laid flat. |
blade light green, ± round, 2-8 × 3.5-11 cm, sparsely pubescent; ultimate lobes 7-19, width 1-8 mm, apex tapering to point; veins obscure. |
Inflorescences | 5-20(-48)-flowered, ± open; pedicel 0.3-3(-10) cm, glabrous to puberulent; bracteoles 2-3(-5) mm from flowers, green to blue, lanceolate-linear, 3-4(-7) mm, puberulent. |
(14-)30-60(-102)-flowered, dense, cylindric; pedicel spreading, 0.8-2(-3) cm, puberulent; bracteoles 1-4 mm from flowers, green, linear, 2-7(-10) mm, puberulent. |
Flowers | sepals dark blue, nearly glabrous, lateral sepals spreading, 9-15 × 5-8 mm, spurs usually upcurved, ascending 30-45° above horizontal, 10-14 mm; lower petal blades slightly elevated, ± exposing stamens, 4-5 mm, clefts 2-3 mm; hairs centered, densest on inner lobe above base of cleft, also on margins, white. |
sepals bright blue, puberulent, lateral sepals spreading, 9-13 × 4-7 mm, spurs straight, within 30° above or below horizontal, 11-17 mm; lower petal blades ± covering stamens, 4-8 mm, clefts 0.5-2 mm; hairs sparse, centered, mostly near junction of blade and claw above base of cleft, white. |
Fruits | 10-18 mm, 4.1-4.5 times longer than wide, puberulent. |
10-15 mm, 3.5-4.5 times longer than wide, puberulent. |
Seeds | seed coat cells with surfaces bumpy or wavy. |
wing-margined; seed coat cells with margins straight, surfaces ± roughened. |
2n | = 16. |
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Delphinium uliginosum |
Delphinium stachydeum |
|
Phenology | Flowering late spring–early summer. | Flowering summer. |
Habitat | Serpentine streamsides, chaparral, grassland | Swales in Artemisia scrub |
Elevation | 400-600 m (1300-2000 ft) | 1300-3000 m (4300-9800 ft) |
Distribution |
CA
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CA; ID; NV; OR; WA
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Discussion | Although some populations are large, Delphinium uliginosum is very local. Hybrids with D. hesperium subsp. pallescens have been seen. Delphinium uliginosum is a very distinctive species, not likely to be confused with any other. The fan-shaped, slightly dissected leaves are apparently unique in the genus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Populations of Delphinium stachydeum are widely scattered in isolated mountain ranges surrounded by desert or grassland. The species has been reported (visual sightings) from northwestern Utah; no specimens have been seen from there. Hybrids between D. stachydeum and D. glaucum have been reported. Although D. stachydeum has been seen flowering within 30 m of flowering D. depauperatum, no hybrids have been observed. Delphinium stachydeum may possibly be confused with D. geyeri, from which it may be distinguished by its usually greater plant size, less pubescent foliage, and later flowering date. Delphinium stachydeum also may be confused with D. glaucum; see discussion under that species. (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. scopulorum var. stachydeum, D. confertiflorum, D. umatillense | |
Name authority | Curran: Proc. Calif. Acad. Sci. 1: 151. (1885) | (A. Gray) Tidestrom: Proc. Biol. Soc. Wash. 27: 61. (1914) |
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