Delphinium nuttallii subsp. ochroleucum(synonym of Delphinium leucophaeum) |
Delphinium treleasei |
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pale larkspur, white rock larkspur |
glade larkspur, Trelease's larkspur |
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Stems | 30-60 cm. |
(40-)60-80(-110) cm; base reddish, glabrous, glaucous. |
Leaves | blade round to reniform, 0.5-8 × 2-20 cm, glabrous; ultimate lobes 3-35(-56), 5 or more extending more than 3/5 distance to petiole, width 2-6 mm (basal), 0.5-2 mm (cauline), widest at middle or in proximal 1/2. |
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Inflorescences | 5-30(-56)-flowered; pedicel (1-)2.5-7(-11) cm, glabrous; bracteoles 1-7(-46) mm from flowers, blue or green, awl-shaped, 1.5-4(-12) mm, glabrous. |
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Flowers | sepals white or light yellow, spurs 9-11 mm; lower petal blades 4-6 mm. |
sepals dark bright blue, usually retaining color upon drying, nearly glabrous, lateral sepals spreading, (10-)12-17(-20) × 4-8(-10) mm, spurs straight, ascending ca. 45°, 15-17 mm; lower petal blades ± covering stamens, 5-8 mm, clefts (1-)3-5 mm; hairs centered, densest above base of cleft, yellow. |
Fruits | 12-18(-22) mm, 3-4 times longer than wide, glabrous. |
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Seeds | unwinged; seed coat cell surfaces smooth. |
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2n | = 16. |
= 16. |
Delphinium nuttallii subsp. ochroleucum |
Delphinium treleasei |
|
Phenology | Flowering late spring. | Flowering late spring. |
Habitat | Rock outcrops, rocky meadows | Open juniper glades on calcareous substrate |
Elevation | 50-100 m (200-300 ft) | 250-450 m (800-1500 ft) |
Distribution |
OR
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AR; MO |
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 treleasei is locally abundant but extremely limited by microhabitat within its distributional range. Hybrids between Delphinium treleasei and D. carolinianum subsp. carolinianum are known. (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) | Bush ex K. C. Davis: Minnesota Bot. Stud. 2: 444. (1900) |
Web links |