Delphinium nuttallii subsp. ochroleucum(synonym of Delphinium leucophaeum) |
Delphinium antoninum |
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pale larkspur, white rock larkspur |
Anthony Peak larkspur, Tracy's larkspur |
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Stems | 30-60 cm. |
(7-)15-30(-60) cm; base reddish, glabrous to puberulent. |
Leaves | blade round, 0.8-4 × 1.2-8 cm, ± succulent, nearly glabrous; ultimate lobes 3-15, width 1-8 mm (basal), 1-4 mm (cauline). |
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Inflorescences | 3-25-flowered; pedicel (0.6-)1.2-3.2 cm, usually puberulent; bracteoles 4-6 mm from flowers, green, linear, 3-5 mm, puberulent. |
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Flowers | sepals white or light yellow, spurs 9-11 mm; lower petal blades 4-6 mm. |
sepals dark blue to white, nearly glabrous, lateral sepals spreading to reflexed, 11-13 × 4-6 mm, spurs straight to gently decurved, within 30° above or below horizontal, 12-16 mm; lower petal blades elevated, exposing stamens, 3-7 mm, clefts 1.5-3 mm; hairs centered, mostly on inner lobes above base of cleft, white. |
Fruits | 14-22 mm, 3.5-4 times longer than wide, puberulent. |
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Seeds | unwinged; seed coat cells with surfaces smooth. |
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2n | = 16. |
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Delphinium nuttallii subsp. ochroleucum |
Delphinium antoninum |
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Phenology | Flowering late spring. | Flowering late spring–early summer. |
Habitat | Rock outcrops, rocky meadows | Uncommon on moist talus slopes |
Elevation | 50-100 m (200-300 ft) | 1100-2700 m (3600-8900 ft) |
Distribution |
OR
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CA |
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 antoninum hybridizes with D. decorum subsp. tracyi and with D. nudicaule. Most often confused with D. decorum subsp. tracyi, it is separable on the basis of its longer root, usually reflexed sepals, and typically colorfast flowers. It also may be confused with D. andersonii; 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. Grumosa > Delphinium nuttallii | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Bicoloria |
Sibling taxa | ||
Synonyms | D. menziesii var. (ß) ochroleucum, D. leucophaeum | |
Name authority | (Nuttall) M. J. Warnock: Phytologia 78: 98. (1995) | Eastwood: Leafl. W. Bot. 3: 126. (1942) |
Web links |