Delphinium nuttallii subsp. ochroleucum(synonym of Delphinium leucophaeum) |
Delphinium geraniifolium |
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pale larkspur, white rock larkspur |
Clark Valley larkspur, Mogollon larkspur |
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Stems | 30-60 cm. |
60-100 cm; base reddish, puberulent, midstems pubescent. |
Leaves | blade dark green, at least adaxially, fan-shaped to reniform, 2-5 × 3-7 cm, pubescent, especially abaxially; ultimate lobes 5-15, width 4-15 mm (basal lobes 5-15 mm), apex abruptly tapered, usually mucronate; veins prominent. |
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Inflorescences | 20-90-flowered, dense, cylindric; pedicel ascending to spreading, 1-2 cm, puberulent; bracteoles 1-2 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 dark blue to purple, puberulent, lateral sepals spreading to slightly forward pointing, 10-14 × 3-5 mm, spurs ascending 20-70°, truncate or downcurved apically, 12-15 mm; lower petal blades slightly elevated, ± exposing stamens, 4-6 mm, clefts 0.5-2 mm; hairs sparse, local below junction of blade and claw, scattered on margins, white. |
Fruits | 13-18 mm, 3-3.5 times longer than wide, puberulent. |
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Seeds | unwinged; seed coat cells with margins straight, surfaces ± roughened. |
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2n | = 16. |
= 16. |
Delphinium nuttallii subsp. ochroleucum |
Delphinium geraniifolium |
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Phenology | Flowering late spring. | Flowering summer. |
Habitat | Rock outcrops, rocky meadows | Heavy clay soil, dry meadows in coniferous woods |
Elevation | 50-100 m (200-300 ft) | 1800-3400 m (5900-11200 ft) |
Distribution |
OR
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AZ; NM
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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.) |
Delphinium geraniifolium is a more pubescent analog of the closely related D. scopulorum, the former occurring in heavier soils at higher elvation. (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. tenuisectum subsp. amplibracteatum |
Name authority | (Nuttall) M. J. Warnock: Phytologia 78: 98. (1995) | Rydberg: Bull. Torrey Bot. Club 26: 583. (1899) |
Web links |