Delphinium umbraculorum |
Delphinium hesperium |
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umbrella larkspur |
foothill larkspur, western larkspur |
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Stems | 40-70(-90) cm; base often reddish, glabrous or puberulent. |
(11-)40-80(-120) cm; base usually reddish, longitudinally ridged, puberulent. |
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Leaves | blade round to pentagonal, 1.5-4 × 2-6 cm, nearly glabrous; ultimate lobes 3-13, width 3-20 mm (basal), 1-8 mm (cauline). |
blade round to pentagonal, 1-4 × 2-6 cm, usually puberulent, especially abaxially; ultimate lobes 3-14, width 3-8 mm (basal), 2-5 mm (cauline). |
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Inflorescences | (5-)10-25(-45)-flowered, open, narrowly pyramidal; pedicel 0.5-3(-7) cm, glabrous to puberulent; bracteoles 3-7 mm from flowers, green, linear, 3-6 mm, puberulent. |
(5-)15-30(-100)-flowered, moderately open; pedicel (0.5-)1-2.5(-7.5) cm, puberulent; bracteoles 2-6(-12) mm from flowers, green to blue, margins often white, linear-lanceolate, 3-7(-12) mm, puberulent. |
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Flowers | sepals dark blue, puberulent, lateral sepals spreading, 9-16 × 4-7 mm, spurs gently upcurved, ascending 30-45° above horizontal, 8-14 mm; lower petal blades elevated, exposing stamens, 3.5-6 mm, clefts 0.5-1.5 mm; hairs densest near junction of blade and claw above base of cleft, centered or on inner lobes, white. |
sepals dark blue to white, puberulent, lateral sepals spreading, 7-13(-16) × 3-10 mm, spurs straight to upcurved, ascending 30-45° above horizontal, 9-18 mm; lower petal blades slightly elevated, ± exposing stamens, 3-8 mm, clefts 1-5 mm; hairs centered, denser on inner lobes near base of cleft, white. |
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Fruits | 9-16(-19) mm, 2.5-3(-4) times longer than wide, puberulent. |
8-18 mm, 2.2-3(-4.2) times longer than wide, sparse puberulent. |
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Seeds | seed coat cells brick-shaped, cell margins straight, surfaces smooth. |
not echinate, appearing ± smooth to naked eye; seed coat cells with margins straight, surfaces smooth or roughened. |
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2n | = 16. |
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Delphinium umbraculorum |
Delphinium hesperium |
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Phenology | Flowering late spring–early summer. | |||||||||
Habitat | Slopes in oak forests | |||||||||
Elevation | 400-1600 m (1300-5200 ft) | |||||||||
Distribution |
CA
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CA
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Discussion | Delphinium umbraculorum is most often confused with D. patens subsp. hepaticoideum; refer to discussion of that taxon for distinguishing features. Hybrids occur with D. parryi and D. patens subsp. montanum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 3 (3 in the flora). Delphinium hesperium is thought to be poisonous to cattle (D. E. Moerman 1986, no subspecies specified). It is often confused with D. hansenii. See discussion under that species for distinguishing features. (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. Subscaposa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Echinata | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | H. F. Lewis & Epling: Brittonia 8: 19. (1954) | A. Gray: Bot. Gaz. 12: 53. (1887) | ||||||||
Web links |