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Delphinium oreganum

Willamette Valley larkspur

Edwards' Plateau larkspur, Sierra madre larkspur

Stems

40-70 cm.

30-80(-100) cm;

base often reddish, puberulent.

Leaves

blade semicircular to cordate, 2-8 × 2-10 cm, nearly glabrous; ultimate lobes 3-12, width 3-10 mm (basal), 2-6 mm (cauline).

Inflorescences

5-75(-98)-flowered;

pedicel 1-2.5(-5) cm, puberulent;

bracteoles 2-4(-8) mm from flowers, green, lanceolate-linear, 3-5 mm, puberulent.

Flowers

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

lower petal blades 4.5-6.5 mm.

sepals dark blue to light blue, puberulent, lateral sepals spreading, 9-15 × 5-7 mm, spurs straight, ascending ca. 45(-90)°, 10-15(-19) mm;

lower petal blades elevated, exposing stamens, 4-7 mm, clefts 2-4 mm;

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

Fruits

15-21 mm, 3.5-4.5 times longer than wide, nearly glabrous.

Seeds

seed coat cells with surfaces pustulate.

2n

= 16.

Delphinium nuttallii subsp. nuttallii

Delphinium madrense

Phenology Flowering late spring–early summer. Flowering spring–early summer.
Habitat Rock outcrops, rocky meadows Calcareous slopes, oak woods or desert scrub
Elevation 20-300 m (100-1000 ft) 300-2100 m (1000-6900 ft)
Distribution
from FNA
OR; WA
from FNA
TX; Mexico (Coahuila, Nuevo León, and Tamaulipas)
[BONAP county map]
Discussion

Delphinium madrense hybridizes with D. carolinianum subspp. vimineum and virescens.

(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. Virescens
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. 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 S. Watson: Proc. Amer. Acad. Arts 17: 141. (1890)
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