Delphinium nuttallii subsp. ochroleucum(synonym of Delphinium leucophaeum) |
Delphinium scopulorum |
|
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pale larkspur, white rock larkspur |
Rocky Mountain larkspur |
|
Stems | 30-60 cm. |
50-120 cm; base often reddish, puberulent, midstems glabrous to subglabrous. |
Leaves | blade round to pentagonal, 1.5-10 × 2-16 cm, nearly glabrous; ultimate lobes 5-19, width 5-30 mm (basal), 1-10 mm (cauline). |
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Inflorescences | 10-30-flowered, open, cylindric; pedicel ascending to spreading, 1-3(-4.5) cm, puberulent; bracteoles 2-7 mm from flowers, green, linear, 2-4 mm, puberulent. |
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Flowers | sepals white or light yellow, spurs 9-11 mm; lower petal blades 4-6 mm. |
sepals bright dark blue, nearly glabrous, lateral sepals forward pointing, 12-15 × 4-6 mm, spurs gently decurved, slightly ascending, 15-20 mm; lower petal blades ± covering stamens, 5-8 mm, clefts 1-3 mm; hairs sparse, centered, mostly below junction of blade and claw, white. |
Fruits | 16-20 mm, 4-4.5 times longer than wide, nearly glabrous. |
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Seeds | wing-margined; seed coat cells with margins straight, cell surfaces ± roughened. |
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2n | = 16. |
= 16. |
Delphinium nuttallii subsp. ochroleucum |
Delphinium scopulorum |
|
Phenology | Flowering late spring. | Flowering late summer–early autumn. |
Habitat | Rock outcrops, rocky meadows | Riparian forests and open woodlands |
Elevation | 50-100 m (200-300 ft) | 1700-2600 m (5600-8500 ft) |
Distribution |
OR
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AZ; NM; Mexico (Sonora) |
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.) |
Hybrids are known with Delphinium andesicola. (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. Wislizenana |
Sibling taxa | ||
Synonyms | D. menziesii var. (ß) ochroleucum, D. leucophaeum | D. macrophyllum |
Name authority | (Nuttall) M. J. Warnock: Phytologia 78: 98. (1995) | A. Gray: Smithsonian Contr. Knowl. 5(6): 9. (1853) |
Web links |