Delphinium bicolor |
Delphinium madrense |
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Flathead larkspur, little larkspur, low larkspur, Montana larkspur |
Edwards' Plateau larkspur, Sierra madre larkspur |
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Stems | 10-40(-70) cm; base often reddish, glabrous to puberulent. |
30-80(-100) cm; base often reddish, puberulent. |
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Leaves | blade round, 1-4 × 1.5-7 cm, glabrous to puberulent; ultimate lobes 3-19, width 1-8 mm (basal), 1-3 mm (cauline). |
blade semicircular to cordate, 2-8 × 2-10 cm, nearly glabrous; ultimate lobes 3-12, width 3-10 mm (basal), 2-6 mm (cauline). |
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Inflorescences | 3-12(-22)-flowered; pedicel 1-4(-8) cm, ± puberulent; bracteoles 2-7(-17) mm from flowers, green, sometimes white-margined, lanceolate, 4-6(-8) mm, puberulent. |
5-75(-98)-flowered; pedicel 1-2.5(-5) cm, puberulent; bracteoles 2-4(-8) mm from flowers, green, lanceolate-linear, 3-5 mm, puberulent. |
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Flowers | sepals dark blue, puberulent, lateral sepals usually spreading, 16-21 × 6-12 mm, spurs straight to gently decurved, ascending 0-40° above horizontal, 13-23 mm; lower petal blades covering stamens, 7-12 mm, clefts 0.1-3 mm; hairs sparse, short, mostly on inner lobes below junction of blade and claw, white or yellow. |
sepals dark blue to light blue, puberulent, lateral sepals spreading, 9-15 × 5-7 mm, spurs straight, ascending ca. 45(-90)°, 10-15(-19) mm; lower petal blades elevated, exposing stamens, 4-7 mm, clefts 2-4 mm; hairs centered, densest on inner lobes near base of cleft, white. |
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Fruits | (12-)16-22 mm, 4-4.5 times longer than wide, usually puberulent. |
15-21 mm, 3.5-4.5 times longer than wide, nearly glabrous. |
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Seeds | often winged; seed coat cells with surfaces ± smooth. |
seed coat cells with surfaces pustulate. |
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Delphinium bicolor |
Delphinium madrense |
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Phenology | Flowering spring–early summer. | |||||
Habitat | Calcareous slopes, oak woods or desert scrub | |||||
Elevation | 300-2100 m (1000-6900 ft) | |||||
Distribution |
ID; MT; ND; NE; SD; WY; AB; BC; SK
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TX; Mexico (Coahuila, Nuevo León, and Tamaulipas) |
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Discussion | Subspecies 2 (2 in the flora). Delphinium bicolor is closely related to D. glareosum; it differs in its wider-lobed cauline leaves, shallower petal clefts, and narrower fruits. The Gosiute consider this plant to be poisonous (D. E. Moerman 1986, subspecies not specified). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Delphinium madrense hybridizes with D. carolinianum subspp. vimineum and virescens. (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. Bicoloria | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Virescens | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Nuttall: J. Acad. Nat. Sci. Philadelphia 7: 10. (1834) | S. Watson: Proc. Amer. Acad. Arts 17: 141. (1890) | ||||
Web links |