Delphinium trolliifolium |
Delphinium lineapetalum |
|
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Columbian larkspur, cow-poison, poison delphinium, poison larkspur |
thinpetal larkspur |
|
Stems | (40-)60-120(-180) cm; base usually reddish, glabrous to puberulent. |
(15-)30-60 cm; base usually reddish, glabrous to glaucous. |
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. |
blade round, 1-5 × 2-6 cm, glabrous; ultimate lobes 5-16, width 1-4 mm (basal), 0.5-3 mm (cauline). |
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. |
(3-)9-24(-40)-flowered, pyramidal; pedicel spreading, 1-2.5 cm, glabrous or glandular-puberulent; bracteoles 4-7 mm from flowers, blue or green, linear, 1-3 mm, glabrous or glandular-puberulent. |
Flowers | 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. |
sepals light blue to lavender, nearly glabrous, lateral sepals reflexed, 10-13 × 3-5 mm, spurs straight to slightly decurved, nearly horizontal to ascending ca. 30°, 11-17 mm; lower petal blades elevated, exposing stamens, 3-5 mm, clefts 0.5-2 mm; hairs centered mostly on inner lobes near base of cleft, white. |
Fruits | (15-)23-34 mm, 3.8-5.5 times longer than wide, glabrous. |
13-21 mm, 4-4.5 times longer than wide, puberulent to glabrous. |
Seeds | unwinged; seed coats smooth. |
seed coat cells narrow, short, cell margins straight, surfaces smooth. |
2n | = 16. |
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Delphinium trolliifolium |
Delphinium lineapetalum |
|
Phenology | Flowering spring. | Flowering spring. |
Habitat | Oak woods, coastal chaparral, wet woodlands | Open pine woods, dry meadows |
Elevation | 30-1100 m (100-3600 ft) | 400-1800 m (1300-5900 ft) |
Distribution |
CA; OR
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WA
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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.) |
Of conservation concern. (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 | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Subscaposa |
Sibling taxa | ||
Synonyms | D. nuttallianum var. lineapetalum | |
Name authority | A. Gray: Proc. Amer. Acad. Arts 8: 375. (1872) | Ewan: Univ. Colorado Stud., Ser. D, Phys. Sci. 2: 126. (1945) |
Web links |