Delphinium nuttallii subsp. ochroleucum(synonym of Delphinium leucophaeum) |
Delphinium nuttallii |
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pale larkspur, white rock larkspur |
Nuttall's larkspur, upland larkspur |
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Stems | 30-60 cm. |
20-60(-90) cm; base usually reddish, pubescent. |
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Leaves | blade round to reniform, 2-8 × 3-14 cm, pubescent; ultimate lobes 5-18, width 4-7 mm (basal), 1-5 mm (cauline), widest at middle or in proximal 1/2. |
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Inflorescences | 5-25(-40)-flowered, at least 2 times longer than wide; pedicel 1.5-4(-9) cm, puberulent; bracteoles 2-3 mm from flowers, green, linear, 4-6 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 yellowish, (± drab), often partly fading upon drying, puberulent, lateral sepals ± spreading, 8-11 × 3-6 mm, spurs straight, slightly ascending, 9-13 mm; lower petal blades ± covering stamens, 4-6 mm, clefts 0.5-2 mm; hairs well dispersed, mostly near margins and base of cleft, white to yellow or blue. |
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Fruits | 10-14(-18) mm, 3.5-4 times longer than wide, pubescent. |
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Seeds | wing-margined; seed coat cell surfaces smooth. |
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2n | = 16. |
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Delphinium nuttallii subsp. ochroleucum |
Delphinium nuttallii |
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Phenology | Flowering late spring. | |||||
Habitat | Rock outcrops, rocky meadows | |||||
Elevation | 50-100 m (200-300 ft) | |||||
Distribution |
OR
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OR; WA
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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.) |
Subspecies 2 (2 in the flora). Delphinium nuttallii has often been confused with D. menziesii; it may be distinguished by consistently smaller flowers and usually more flowers per plant than in the latter. Interestingly, each species produces both blue-purple and yellowish flower colors, in separate populations. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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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. Grumosa | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | D. menziesii var. (ß) ochroleucum, D. leucophaeum | |||||
Name authority | (Nuttall) M. J. Warnock: Phytologia 78: 98. (1995) | A. Gray: Bot. Gaz. 12: 54. (1887) | ||||
Web links |