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Delphinium leucophaeum

pale larkspur, white rock larkspur

mountain larkspur

Stems

30-60 cm.

(45-)70-100 cm;

base sometimes reddish, puberulent.

Leaves

blade round to pentagonal, 2-8 × 4-14 cm, nearly glabrous; ultimate lobes 5-21, width 1-5 mm;

midcauline leaf lobes more than 3 times longer than wide.

Inflorescences

(10-)15-40(-120)-flowered;

pedicel 1-2.5(-4) cm, puberulent;

bracteoles 1-3 mm from flowers, green, sometimes margins white, linear or lanceolate, 3-5(-8) mm, puberulent.

Flowers

sepals white or light yellow, spurs 9-11 mm;

lower petal blades 4-6 mm.

sepals bright dark blue, apex rounded, puberulent, lateral sepals forward pointing to spreading, 11-13 × 4-6 mm, spurs straight, ascending ca. 30° above horizontal, 9-13 mm;

lower petal blades ± covering stamens, 5-7 mm, clefts 2-3 mm;

hairs centered above base of cleft, white.

Fruits

11-17 mm, 3-4 times longer than wide, puberulent.

Seeds

wing-margined;

seed coat cells narrow, short, surfaces roughened.

2n

= 16.

= 16.

Delphinium nuttallii subsp. ochroleucum

Delphinium ramosum

Phenology Flowering late spring. Flowering summer.
Habitat Rock outcrops, rocky meadows Meadows, aspen woodlands, Artemisia scrub
Elevation 50-100 m [200-300 ft] 2100-3200(-3400) m [6900-10500(-11200) ft]
Distribution
from FNA
OR
[WildflowerSearch map]
from FNA
CO; NM
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

The range of morphologic features of Delphinium nuttallii subsp. ochroleucum (D. leucophaeum) is almost completely encompassed within that of D. nuttallii subsp. nuttallii. Sepal color is the only feature consistently separating the two subspecies. Were it not for the fact that any given population typically has plants of only one flower color, a rank of forma would be more appropriate.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Delphinium ramosum hybridizes with D. barbeyi and D. glaucum.

(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. Exaltata
Sibling taxa
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, D. xantholeucum
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. 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
Synonyms D. menziesii var. (ß) ochroleucum, D. leucophaeum
Name authority (Nuttall) M. J. Warnock: Phytologia 78: 98. (1995) Rydberg: Bull. Torrey Bot. Club 28: 276. (1901)
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