Delphinium nuttallii subsp. ochroleucum(synonym of Delphinium leucophaeum) |
Delphinium robustum |
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pale larkspur, white rock larkspur |
robust larkspur, wahatoya creek larkspur |
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Stems | 30-60 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 white or light yellow, spurs 9-11 mm; lower petal blades 4-6 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. ochroleucum |
Delphinium robustum |
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Phenology | Flowering late spring. | Flowering summer. |
Habitat | Rock outcrops, rocky meadows | Riparian woodlands, subalpine meadows |
Elevation | 50-100 m (200-300 ft) | 2200-3000 m (7200-9800 ft) |
Distribution |
OR
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CO; NM |
Discussion | Of conservation concern. The range of morphologic features of Delphinium nuttallii subsp. ochroleucum (D. leucophaeum) is almost completely encompassed within that of D. nuttallii subsp. nuttallii. Sepal color is the only feature consistently separating the two subspecies. Were it not for the fact that any given population typically has plants of only one flower color, a rank of forma would be more appropriate. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
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 | ||
Synonyms | D. menziesii var. (ß) ochroleucum, D. leucophaeum | |
Name authority | (Nuttall) M. J. Warnock: Phytologia 78: 98. (1995) | Rydberg: Bull. Torrey Bot. Club 28: 276. (1901) |
Web links |