Flora of North America species comparison

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Delphinium nuttallii subsp. nuttallii

(synonym of Delphinium oreganum)

Delphinium treleasei
Delphinium oreganum

Willamette Valley larkspur

glade larkspur, Trelease's larkspur
Stems

40-70 cm.

(40-)60-80(-110) cm;

base reddish, glabrous, glaucous.
Leaves

blade round to reniform, 0.5-8 × 2-20 cm, glabrous; ultimate lobes 3-35(-56), 5 or more extending more than 3/5 distance to petiole, width 2-6 mm (basal), 0.5-2 mm (cauline), widest at middle or in proximal 1/2.
Inflorescences

5-30(-56)-flowered;

pedicel (1-)2.5-7(-11) cm, glabrous;

bracteoles 1-7(-46) mm from flowers, blue or green, awl-shaped, 1.5-4(-12) mm, glabrous.
Flowers

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

lower petal blades 4.5-6.5 mm.

sepals dark bright blue, usually retaining color upon drying, nearly glabrous, lateral sepals spreading, (10-)12-17(-20) × 4-8(-10) mm, spurs straight, ascending ca. 45°, 15-17 mm;

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

hairs centered, densest above base of cleft, yellow.
Fruits

12-18(-22) mm, 3-4 times longer than wide, glabrous.
Seeds

unwinged;

seed coat cell surfaces smooth.
2n

= 16.

= 16.

Delphinium nuttallii subsp. nuttallii

Delphinium treleasei
Phenology Flowering late spring–early summer. Flowering late spring.
Habitat Rock outcrops, rocky meadows Open juniper glades on calcareous substrate
Elevation 20-300 m (100-1000 ft) 250-450 m (800-1500 ft)
Distribution
from FNA
OR; WA
from FNA
AR; MO
[BONAP county map]
Discussion

Delphinium treleasei is locally abundant but extremely limited by microhabitat within its distributional range.

Hybrids between Delphinium treleasei and D. carolinianum subsp. carolinianum are known.

(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. Grumosa
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. scopulorum, D. stachydeum, D. sutherlandii, D. tricorne, D. trolliifolium, D. uliginosum, D. umbraculorum, D. variegatum, D. viridescens, D. wootonii, D. xantholeucum
Name authority unknown Bush ex K. C. Davis: Minnesota Bot. Stud. 2: 444. (1900)
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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