Delphinium nuttallii subsp. nuttallii(synonym of Delphinium oreganum) |
Delphinium luteum |
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Willamette Valley larkspur |
golden larkspur, yellow larkspur |
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Stems | 40-70 cm. |
20-40(-55) cm; base often reddish, nearly glabrous. |
Leaves | blade round to pentagonal, 1-5 × 2-10 cm, nearly glabrous; ultimate lobes 3-5, width 8-30 mm (basal), 5-15 mm (cauline). |
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Inflorescences | 5-25(-37)-flowered; pedicel (1-)3-5(-7) cm, puberulent; bracteoles 6-10(-17) mm from flowers, green, linear-lanceolate, 6-7 mm, nearly glabrous. |
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Flowers | sepals blue or bluish purple, spurs 10-13 mm; lower petal blades 4.5-6.5 mm. |
sepals bright yellow, puberulent, appearing waxy, lateral sepals ± forward pointing, (11-)14-16 × (6-)9-13 mm, spur straight, ca. 30° below horizontal, 11-20 mm; lower petal blades elevated, exposing stamens, 3-4 mm, clefts 0.5-1.5 mm; hairs sparse or absent, ± evenly distributed if present, white to yellow. |
Fruits | 11-14 mm, 3.5-4.5 times longer than wide, glabrous. |
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Seeds | unwinged; seed coat cell surfaces smooth. |
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2n | = 16. |
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Delphinium nuttallii subsp. nuttallii |
Delphinium luteum |
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Phenology | Flowering late spring–early summer. | Flowering late winter-mid spring. |
Habitat | Rock outcrops, rocky meadows | Wet cliffs, coastal grassland or chaparral |
Elevation | 20-300 m (100-1000 ft) | 0-50 m (0-200 ft) |
Distribution |
OR; WA |
CA
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Discussion | Of conservation concern. Delphinium luteum is presently known from only three populations. It is known to hybridize with D. decorum and with D. nudicaule. Populations of D. hesperium subsp. hesperium also occur at the type locality; D. luteum flowers earlier and hybrids are not known. Delphinium luteum is not likely to be mistaken for any other species of Delphinium. It has been treated as a variety of D. nudicaule and is closely related to that species. Sepals of the infrequent yellow-flowered phase of D. nudicaule, however, have a much drabber appearance compared with the bright shining yellow of the sepals in D. luteum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Grumosa > Delphinium nuttallii | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Bicoloria |
Sibling taxa | ||
Name authority | unknown | A. Heller: Bull. S. Calif. Acad. Sci. 6: 68. (1903) |
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