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Delphinium oreganum

Willamette Valley larkspur

Delphinium basalticum

basalt larkspur, basaltic larkspur, Columbia Gorge larkspur

Stems

40-70 cm.

20-50(-65) cm;

base often reddish, puberulent.

Leaves

blade round, 2-6 × 5-9 cm, not succulent, nearly glabrous; ultimate lobes 5-19, width 3-15 mm (basal), 1-12 mm (cauline).

Inflorescences

(2-)6-16(-26)-flowered;

pedicel 2-7 cm, nearly glabrous;

bracteoles 4-12 mm from flowers, green, linear, 3-7 mm, nearly glabrous.

Flowers

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

lower petal blades 4.5-6.5 mm.

sepals dark blue, nearly glabrous, lateral sepals spreading, 15-21 × 7-10 mm, spur straight to decurved, ascending 30-45° above horizontal, 14-18 mm;

lower petal blades slightly elevated, ± exposing stamens, 7-9 mm, cleft 4-5 mm;

hairs centered, mostly on inner lobes above base of cleft, yellow to white.

Fruits

12-17 mm, 3.5-4 times longer than wide, glabrous.

Seeds

± wing-margined;

seed coat cells with surfaces smooth.

2n

= 16.

Delphinium nuttallii subsp. nuttallii

Delphinium basalticum

Phenology Flowering late spring–early summer. Flowering spring (-early summer).
Habitat Rock outcrops, rocky meadows Basaltic cliff faces, n and e slopes at base of cliffs
Elevation 20-300 m (100-1000 ft) 200-500 m (700-1600 ft)
Distribution
from FNA
OR; WA
from FNA
OR; WA
[BONAP county map]
Discussion

Of conservation concern.

Hybrids between Delphinium basalticum and D. trolliifolium 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. Bicoloria
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. 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, D. xantholeucum
Name authority unknown M. J. Warnock: Phytologia 78: 91. (1995)
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