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Delphinium oreganum

Willamette Valley larkspur

Rocky Mountain larkspur

Stems

40-70 cm.

50-120 cm;

base often reddish, puberulent, midstems glabrous to subglabrous.

Leaves

blade round to pentagonal, 1.5-10 × 2-16 cm, nearly glabrous; ultimate lobes 5-19, width 5-30 mm (basal), 1-10 mm (cauline).

Inflorescences

10-30-flowered, open, cylindric;

pedicel ascending to spreading, 1-3(-4.5) cm, puberulent;

bracteoles 2-7 mm from flowers, green, linear, 2-4 mm, puberulent.

Flowers

sepals blue or bluish purple, spurs 10-13 mm;

lower petal blades 4.5-6.5 mm.

sepals bright dark blue, nearly glabrous, lateral sepals forward pointing, 12-15 × 4-6 mm, spurs gently decurved, slightly ascending, 15-20 mm;

lower petal blades ± covering stamens, 5-8 mm, clefts 1-3 mm;

hairs sparse, centered, mostly below junction of blade and claw, white.

Fruits

16-20 mm, 4-4.5 times longer than wide, nearly glabrous.

Seeds

wing-margined;

seed coat cells with margins straight, cell surfaces ± roughened.

2n

= 16.

= 16.

Delphinium nuttallii subsp. nuttallii

Delphinium scopulorum

Phenology Flowering late spring–early summer. Flowering late summer–early autumn.
Habitat Rock outcrops, rocky meadows Riparian forests and open woodlands
Elevation 20-300 m (100-1000 ft) 1700-2600 m (5600-8500 ft)
Distribution
from FNA
OR; WA
from FNA
AZ; NM; Mexico (Sonora)
[BONAP county map]
Discussion

Hybrids are known with Delphinium andesicola.

(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. Wislizenana
Sibling taxa
D. nuttallii subsp. nuttallii, D. nuttallii subsp. ochroleucum
D. alabamicum, D. alpestre, D. andersonii, D. andesicola, D. antoninum, D. bakeri, D. barbeyi, D. basalticum, D. bicolor, D. brachycentrum, D. californicum, D. cardinale, D. carolinianum, D. decorum, D. depauperatum, D. distichum, D. elatum, D. exaltatum, D. geraniifolium, D. geyeri, D. glareosum, D. glaucescens, D. glaucum, D. gracilentum, D. gypsophilum, D. hansenii, D. hesperium, D. hutchinsoniae, D. inopinum, D. lineapetalum, D. luteum, D. madrense, D. menziesii, D. multiplex, D. newtonianum, D. novomexicanum, D. nudicaule, D. nuttallianum, D. nuttallii, D. parishii, D. parryi, D. patens, D. polycladon, D. purpusii, D. ramosum, D. recurvatum, D. robustum, D. sapellonis, D. scaposum, D. stachydeum, D. sutherlandii, D. treleasei, D. tricorne, D. trolliifolium, D. uliginosum, D. umbraculorum, D. variegatum, D. viridescens, D. wootonii, D. xantholeucum
Synonyms D. macrophyllum
Name authority unknown A. Gray: Smithsonian Contr. Knowl. 5(6): 9. (1853)
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