Flora of North America species comparison

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Delphinium nuttallii subsp. nuttallii

(synonym of Delphinium oreganum)

Delphinium lineapetalum
Delphinium oreganum

Willamette Valley larkspur

thinpetal larkspur
Stems

40-70 cm.

(15-)30-60 cm;

base usually reddish, glabrous to glaucous.
Leaves

blade round, 1-5 × 2-6 cm, glabrous; ultimate lobes 5-16, width 1-4 mm (basal), 0.5-3 mm (cauline).
Inflorescences

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

lower petal blades 4.5-6.5 mm.

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

13-21 mm, 4-4.5 times longer than wide, puberulent to glabrous.
Seeds

seed coat cells narrow, short, cell margins straight, surfaces smooth.
2n

= 16.

Delphinium nuttallii subsp. nuttallii

Delphinium lineapetalum
Phenology Flowering late spring–early summer. Flowering spring.
Habitat Rock outcrops, rocky meadows Open pine woods, dry meadows
Elevation 20-300 m (100-1000 ft) 400-1800 m (1300-5900 ft)
Distribution
from FNA
OR; WA
from FNA
WA
[WildflowerSearch map]
[BONAP county map]
Discussion

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 > Delphinium nuttallii Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Subscaposa
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. 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. scopulorum, D. stachydeum, D. sutherlandii, D. treleasei, D. tricorne, D. trolliifolium, D. uliginosum, D. umbraculorum, D. variegatum, D. viridescens, D. wootonii, D. xantholeucum
Synonyms D. nuttallianum var. lineapetalum
Name authority unknown Ewan: Univ. Colorado Stud., Ser. D, Phys. Sci. 2: 126. (1945)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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