Delphinium nuttallii subsp. ochroleucum(synonym of Delphinium leucophaeum) |
Delphinium newtonianum |
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pale larkspur, white rock larkspur |
newton's larkspur, Ozark larkspur |
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Stems | 30-60 cm. |
40-90 cm; base often reddish, puberulent. |
Leaves | blade round to pentagonal, 4-7 × 5-15 cm, nearly glabrous; ultimate lobes 3-7, width 8-20 mm (basal), 5-15 mm (cauline), widest at middle or in proximal 1/2. |
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Inflorescences | 8-20(-40)-flowered, as wide as long or nearly so; pedicel 1-4(-6) cm, pubescent; bracteoles 6-15 mm from flowers, green, linear, 1.5-5 mm, puberulent. |
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Flowers | sepals white or light yellow, spurs 9-11 mm; lower petal blades 4-6 mm. |
sepals dark to light blue, rarely white, glabrous, lateral sepals spreading, 12-14 × 6-7 mm, spurs straight to decurved, within 30° of horizontal, 10-15 mm; lower petal blades slightly elevated, ± exposing stamens, 4-5 mm, clefts 2-3 mm; hairs mostly centered near base of cleft, yellow. |
Fruits | 8-12 mm, 3-3.5 times longer than wide, nearly glabrous. |
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Seeds | unwinged; surface of each seed coat cell with swollen, blunt, hairlike structures, barely visible at 20x, otherwise smooth. |
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2n | = 16. |
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Delphinium nuttallii subsp. ochroleucum |
Delphinium newtonianum |
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Phenology | Flowering late spring. | Flowering early summer. |
Habitat | Rock outcrops, rocky meadows | Slopes in deciduous forest |
Elevation | 50-100 m (200-300 ft) | 500-700 m (1600-2300 ft) |
Distribution |
OR
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AR |
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.) |
No cases of hybridization are known. Delphinium newtonianum often occurs in mixed populations with D. tricorne. It normally does not begin flowering until 4-6 weeks after D. tricorne has finished. (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) | D. M. Moore: Rhodora 41: 196. (1939) |
Web links |