Delphinium hansenii |
Delphinium treleasei |
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Eldorado larkspur, Hansen's delphinium, Hansen's larkspur |
glade larkspur, Trelease's larkspur |
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Stems | (25-)40-80(-180) cm; base usually reddish, pubescent. |
(40-)60-80(-110) cm; base reddish, glabrous, glaucous. |
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Leaves | blade pentagonal, 1.5-5 × 2.5-8 cm, long-pubescent, especially abaxially; ultimate lobes 0-18, width 4-20 mm (basal), 2-9 mm (cauline). |
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 | (9-)15-40(-160)-flowered, dense to open; pedicel 0.3-2.5(-6) cm, puberulent; bracteoles 1-5(-8) mm from flowers, green, sometimes white-margined, linear-lanceolate, 2-6(-8) mm, puberulent. |
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 violet to white, ± puberulent, lateral sepals spreading to forward pointing, 7-10(-13) × 3-6(-8) mm, spurs gently upcurved, ascending 0-30° above horizontal, (6-)9-13(-16) mm; lower petal blades elevated, ± exposing stamens, 3-7 mm, cleft 1-2(-4) mm; hairs centered, densest on inner lobes near base of cleft, white. |
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. |
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Fruits | 8-20 mm, 2.2-4 times longer than wide, glabrous. |
12-18(-22) mm, 3-4 times longer than wide, glabrous. |
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Seeds | echinate, appearing fuzzy to naked eye; seed coat cells with margins straight, surfaces sparsely pustulate. |
unwinged; seed coat cell surfaces smooth. |
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2n | = 16. |
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Delphinium hansenii |
Delphinium treleasei |
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Phenology | Flowering late spring. | |||||||||
Habitat | Open juniper glades on calcareous substrate | |||||||||
Elevation | 250-450 m (800-1500 ft) | |||||||||
Distribution |
CA
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AR; MO |
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Discussion | Subspecies 3 (3 in the flora). Although Delphinium hansenii has often been confused with D. hesperium, seeds will instantly allow identification. Seeds of Delphinium hansenii are, as far as known, unique, bearing numerous, elongate, prismlike raised structures (extensions of single cells or small groups of cells) over the entire seed coat. If seeds are absent, larger flowers, more open inflorescences (except in D. hesperium subsp. cuyamacae), and general absence of pubescence of long hairs in D. hesperium are apparent upon comparison of the two species. Separating D. hansenii from D. variegatum may also be difficult. Again, seeds leave no doubt. In addition, smaller flowers and greater number of flowers per plant of D. hansenii should serve to distinguish D. hansenii from D. variegatum. White-flowered D. hansenii has been confused with D. gypsophilum and with D. hesperium subsp. pallescens. Other than seeds, pubescence of long hairs and smaller flowers present in D. hansenii and absent in the others will distinguish them. (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.) |
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Key |
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Source | FNA vol. 3. | FNA vol. 3. | ||||||||
Parent taxa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Echinata | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Grumosa | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | D. hesperium var. hansenii | |||||||||
Name authority | (Greene) Greene: Pittonia 3: 94. (1896) | Bush ex K. C. Davis: Minnesota Bot. Stud. 2: 444. (1900) | ||||||||
Web links |