Flora of North America species comparison

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Delphinium nuttallii subsp. nuttallii

(synonym of Delphinium oreganum)

Delphinium brachycentrum
Delphinium oreganum

Willamette Valley larkspur

arctic larkspur, northern larkspur
Stems

40-70 cm.

20-50(-80) cm;

base often reddish, pubescent.
Leaves

blade round to pentagonal, 1.5-6 × 3-11 cm, puberulent; ultimate lobes 5-15, width 1-7(-15) mm.
Inflorescences

5-18-flowered;

pedicel 1-4.5 cm, pubescent;

bracteoles 2-7 mm from flowers, blue, linear, 5-8 mm, puberulent.
Flowers

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

lower petal blades 4.5-6.5 mm.

sepals dark blue, apex rounded, puberulent, lateral sepals forward pointing, 17-24 × 7-9 mm, spurs straight to slightly decurved, ascending 30-60° above horizontal, 15-17 mm;

lower petal blades ± covering stamens, 5-7 mm, clefts 0.5-1.5 mm;

hairs sparse, local, centered, mostly above base of cleft, white.
Fruits

14-17 mm, 3.5-4 times longer than wide, pubescent.
Seeds

wing-margined;

seed coat cells ± elongate, surfaces roughened.
2n

= 16.

Delphinium nuttallii subsp. nuttallii

Delphinium brachycentrum
Phenology Flowering late spring–early summer. Flowering summer.
Habitat Rock outcrops, rocky meadows Well-drained tundra slopes
Elevation 20-300 m (100-1000 ft) 0-1600 m (0-5200 ft)
Distribution
from FNA
OR; WA
from FNA
AK; YT; e Asia
[BONAP county map]
Discussion

Hybrids with Delphinium glaucum are known as D. ×nutans A. Nelson.

(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. Exaltata
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. 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. 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. chamissonis
Name authority unknown Ledebour: Fl. Ross. 1: 60. (1841)
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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