Delphinium nuttallii subsp. nuttallii(synonym of Delphinium oreganum) |
Delphinium robustum |
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Willamette Valley larkspur |
robust larkspur, wahatoya creek larkspur |
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Stems | 40-70 cm. |
100-200(-250) cm; base sometimes reddish, glabrous, glaucous. |
Leaves | blade round to pentagonal, 7-12 × 10-20 cm, nearly glabrous; ultimate lobes 5-15, width 6-30 mm, tips gradually tapered to mucronate apex; midcauline leaf lobes more than 3 times longer than wide. |
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Inflorescences | 40-90(-180)-flowered; pedicel 0.5-2 cm, puberulent; bracteoles 4-6 mm from flowers, green to purple, linear, 5-8 mm, puberulent. |
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Flowers | sepals blue or bluish purple, spurs 10-13 mm; lower petal blades 4.5-6.5 mm. |
sepals bluish purple to pale lavender, nearly glabrous, lateral sepals ± forward pointing, 9-14 × 4-6 mm, spurs slightly decurved, 30-45° above horizontal, dark blue, 10-13 mm; lower petal blades ± covering stamens, 5-7 mm, clefts 2-3 mm; hairs centered, mostly on inner lobes near base of cleft, yellow to white. |
Fruits | 13-18 mm, 3-4 times longer than wide, puberulent. |
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Seeds | wing-margined; seed coat cells elongate, surfaces smooth. |
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2n | = 16. |
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Delphinium nuttallii subsp. nuttallii |
Delphinium robustum |
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Phenology | Flowering late spring–early summer. | Flowering summer. |
Habitat | Rock outcrops, rocky meadows | Riparian woodlands, subalpine meadows |
Elevation | 20-300 m (100-1000 ft) | 2200-3000 m (7200-9800 ft) |
Distribution |
OR; WA |
CO; NM |
Discussion | Of conservation concern. Delphinium robustum is the representative of the southern Cordilleran complex from the Jemez, San Antonio, San Juan, San Pedro, and Sangre de Cristo mountains. Hybrids are known with D. sapellonis. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Grumosa > Delphinium nuttallii | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Exaltata |
Sibling taxa | ||
Name authority | unknown | Rydberg: Bull. Torrey Bot. Club 28: 276. (1901) |
Web links |