Flora of North America species comparison

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Delphinium nuttallii subsp. nuttallii

(synonym of Delphinium oreganum)

Delphinium geyeri
Delphinium oreganum

Willamette Valley larkspur

Geyer's larkspur, poisonweed
Stems

40-70 cm.

(15-)30-60(-80) cm;

base usually reddish, puberulent.
Leaves

blade light green, ± round, 1-5 × 1-6 cm, densely pubescent; ultimate lobes 7-20, width 2-5 mm (basal), 2-4 mm (cauline), apex gradually tapering to point;

veins obscure.
Inflorescences

6-30(-60)-flowered, ± open, cylindric;

pedicel ascending to spreading, 1-3(-4) cm, puberulent;

bracteoles 1-3 mm from flowers, green, lanceolate, 3-6 mm, puberulent.
Flowers

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

lower petal blades 4.5-6.5 mm.

sepals bright blue, puberulent, lateral sepals spreading, 10-18 × 4-8 mm, spurs straight to slightly downcurved, ascending 0-30°, 11-16 mm;

lower petal blades slightly elevated, ± exposing stamens, 4-8 mm, clefts 0.5-2 mm;

hairs centered, densest on inner lobes near base of cleft, white to light yellow.
Fruits

11-15 mm, 3-3.5 times longer than wide, sparse puberulent.
Seeds

unwinged;

seed coat cells with margins straight, surfaces ± roughened.
2n

= 16.

= 16.

Delphinium nuttallii subsp. nuttallii

Delphinium geyeri
Phenology Flowering late spring–early summer. Flowering late spring–early summer.
Habitat Rock outcrops, rocky meadows Grasslands or Artemisia-Cercocarpus scrub
Elevation 20-300 m (100-1000 ft) 1400-3000 m (4600-9800 ft)
Distribution
from FNA
OR; WA
from FNA
CO; MT; NE; UT; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Apparently closely related to Delphinium stachydeum, D. geyeri is generally smaller, earlier flowering, with more finely dissected leaves and a more eastern geographic distribution.

(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. 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
Name authority unknown Greene: Erythea 2: 189. (1894)
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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