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Delphinium oreganum

Willamette Valley larkspur

yellow-white larkspur

Stems

40-70 cm.

40-60(-100) cm;

base often reddish, glabrous, ± glaucous.

Leaves

blade round, 2-6 × 4-10 cm, nearly glabrous; ultimate lobes 3-15, width 3-8 mm (basal), 1-5 mm (cauline).

Inflorescences

10-20(-60)-flowered, narrowly pyramidal;

pedicel spreading, yellowish, 1.5-3 cm, ± glandular-puberulent;

bracteoles 6-12 mm from flowers, green to light brown, linear to lanceolate, 4-7 mm, nearly glabrous.

Flowers

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

lower petal blades 4.5-6.5 mm.

sepals yellow, glabrous, lateral sepals reflexed, 9-12 × 3-5 mm, spurs straight, ascending ca. 45° above horizontal, 11-15 mm;

lower petal blades elevated, exposing stamens, 3-5 mm, clefts 1-2 mm;

hairs centered mostly on inner lobes near base of cleft, white.

Fruits

15-22 mm, 3-4 times longer than wide, glabrous to glandular-puberulent.

Seeds

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

2n

= 16.

= 16.

Delphinium nuttallii subsp. nuttallii

Delphinium xantholeucum

Phenology Flowering late spring–early summer. Flowering spring.
Habitat Rock outcrops, rocky meadows Slopes in open yellow pine forests, grasslands, sage scrub
Elevation 20-300 m (100-1000 ft) 150-600 m (500-2000 ft)
Distribution
from FNA
OR; WA
from FNA
WA
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Delphinium xantholeucum is very local; much of the habitat of this species has been converted to orchards.

(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. 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
Name authority unknown Piper: Contr. U.S. Natl. Herb. 11: 280. (1906)
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