Delphinium nuttallii subsp. ochroleucum(synonym of Delphinium leucophaeum) |
Delphinium madrense |
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pale larkspur, white rock larkspur |
Edwards' Plateau larkspur, Sierra madre larkspur |
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Stems | 30-60 cm. |
30-80(-100) cm; base often reddish, puberulent. |
Leaves | 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 | 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 white or light yellow, spurs 9-11 mm; lower petal blades 4-6 mm. |
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. |
Fruits | 15-21 mm, 3.5-4.5 times longer than wide, nearly glabrous. |
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Seeds | seed coat cells with surfaces pustulate. |
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2n | = 16. |
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Delphinium nuttallii subsp. ochroleucum |
Delphinium madrense |
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Phenology | Flowering late spring. | Flowering spring–early summer. |
Habitat | Rock outcrops, rocky meadows | Calcareous slopes, oak woods or desert scrub |
Elevation | 50-100 m (200-300 ft) | 300-2100 m (1000-6900 ft) |
Distribution |
OR
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TX; Mexico (Coahuila, Nuevo León, and Tamaulipas) |
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 madrense hybridizes with D. carolinianum subspp. vimineum and virescens. (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. Virescens |
Sibling taxa | ||
Synonyms | D. menziesii var. (ß) ochroleucum, D. leucophaeum | |
Name authority | (Nuttall) M. J. Warnock: Phytologia 78: 98. (1995) | S. Watson: Proc. Amer. Acad. Arts 17: 141. (1890) |
Web links |