Delphinium nuttallii subsp. ochroleucum(synonym of Delphinium leucophaeum) |
Delphinium alabamicum |
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pale larkspur, white rock larkspur |
Alabama larkspur |
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Stems | 30-60 cm. |
(45-)60-90(-130) cm; base reddish, pubescent. |
Leaves | blade reniform to semicircular, 2-11 × 3-19 cm, nearly glabrous; ultimate lobes 3-35, width 3-8 mm (basal), 0.5-3 mm (cauline), widest at middle or in proximal 1/2. |
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Inflorescences | 5-27-flowered; pedicel 1-5 cm, puberulent; bracteoles 3-12 mm from flowers, green, linear, 2-8 mm, puberulent. |
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Flowers | sepals white or light yellow, spurs 9-11 mm; lower petal blades 4-6 mm. |
sepals royal blue, ± drab, often partly fading upon drying, puberulent, lateral sepals spreading, 12-20 × 5-10 mm, spurs straight, horizontal to slightly ascending, (13-)15-16.5(-19) mm; lower petal blades ± covering reproductive parts, 4-10 mm, clefts 3-5 mm; hairs centered between claw and base of cleft, covering most of adaxial surface, white. |
Fruits | 11-18 mm, 2.5-3 times longer than wide, sparsely puberulent. |
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Seeds | unwinged; surface of each seed coat cell with with swollen, blunt, hairlike structures, barely visible at 20x, otherwise smooth. |
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2n | = 16. |
= 16. |
Delphinium nuttallii subsp. ochroleucum |
Delphinium alabamicum |
|
Phenology | Flowering late spring. | Flowering mid-late spring. |
Habitat | Rock outcrops, rocky meadows | Very local, thin soils in and on edges of Juniperus glades on limestone substrates |
Elevation | 50-100 m (200-300 ft) | 100-300 m (300-1000 ft) |
Distribution |
OR
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AL; GA
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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.) |
Of conservation concern. In addition to the Alabama sites, Delphinium alabamicum is known from one population in Georgia; it might have been transplanted there. Delphinium alabamicum has not been seen in central Alabama since 1950; populations there might have been extirpated. (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. Grumosa |
Sibling taxa | ||
Synonyms | D. menziesii var. (ß) ochroleucum, D. leucophaeum | |
Name authority | (Nuttall) M. J. Warnock: Phytologia 78: 98. (1995) | Kral: Sida 6: 250. (1976) |
Web links |