Delphinium nuttallii subsp. nuttallii(synonym of Delphinium oreganum) |
Delphinium trolliifolium |
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Willamette Valley larkspur |
Columbian larkspur, cow-poison, poison delphinium, poison larkspur |
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Stems | 40-70 cm. |
(40-)60-120(-180) cm; base usually reddish, glabrous to puberulent. |
Leaves | blade ± pentagonal, 4-8 × 7-16 cm, margins ± incised, nearly glabrous; ultimate lobes 0-9, width 15-30 mm (basal), 5-20 mm (cauline), widest at middle or in proximal 1/2. |
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Inflorescences | (5-)14-40(-75)-flowered, ± open, at least 2 times longer than wide; pedicel 1-4(-9) cm, puberulent to glabrous; bracteoles (2-)6-12 mm from flowers, green, linear, 5-9(-14) mm, puberulent. |
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Flowers | sepals blue or bluish purple, spurs 10-13 mm; lower petal blades 4.5-6.5 mm. |
sepals dark blue, glabrous, lateral sepals spreading, (8-)14-21 × 5-9 mm, spurs straight or downcurved at apex, within 20° of horizontal, (10-)16-23 mm; lower petal blades covering stamens, 5-10 mm, clefts 1.5-3 mm; hairs sparse, mostly near junction of blade and claw, centered or on inner lobes, well dispersed, yellow. |
Fruits | (15-)23-34 mm, 3.8-5.5 times longer than wide, glabrous. |
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Seeds | unwinged; seed coats smooth. |
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2n | = 16. |
= 16. |
Delphinium nuttallii subsp. nuttallii |
Delphinium trolliifolium |
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Phenology | Flowering late spring–early summer. | Flowering spring. |
Habitat | Rock outcrops, rocky meadows | Oak woods, coastal chaparral, wet woodlands |
Elevation | 20-300 m (100-1000 ft) | 30-1100 m (100-3600 ft) |
Distribution |
OR; WA |
CA; OR
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Discussion | Delphinium trolliifolium occurs in the northern Coast Range of California, the Columbia River Valley to just east of Mt. Hood, and the Willamette Valley of Oregon upstream to Lane County. California plants differ somewhat from Oregon plants in pubescence patterns and habitat preferences. Further study may show that two entities are involved here. Hybrids between Delphinium trolliifolium and D. decorum, D. menziesii subsp. pallidum (D. ×pavonaceum Ewan, Peacock larkspur), D. nudicaule, D. nuttallianum, and D. nuttallii are known. Delphinium trolliifolium is likely to be confused only with D. bakeri. Refer to discussion under that species for differences. (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. Grumosa |
Sibling taxa | ||
Name authority | unknown | A. Gray: Proc. Amer. Acad. Arts 8: 375. (1872) |
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