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Delphinium leucophaeum

pale larkspur, white rock larkspur

robust larkspur, wahatoya creek larkspur

Stems

30-60 cm.

100-200(-250) cm;

base sometimes reddish, glabrous, glaucous.

Leaves

blade round to pentagonal, 7-12 × 10-20 cm, nearly glabrous; ultimate lobes 5-15, width 6-30 mm, tips gradually tapered to mucronate apex;

midcauline leaf lobes more than 3 times longer than wide.

Inflorescences

40-90(-180)-flowered;

pedicel 0.5-2 cm, puberulent;

bracteoles 4-6 mm from flowers, green to purple, linear, 5-8 mm, puberulent.

Flowers

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

lower petal blades 4-6 mm.

sepals bluish purple to pale lavender, nearly glabrous, lateral sepals ± forward pointing, 9-14 × 4-6 mm, spurs slightly decurved, 30-45° above horizontal, dark blue, 10-13 mm;

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

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

Fruits

13-18 mm, 3-4 times longer than wide, puberulent.

Seeds

wing-margined;

seed coat cells elongate, surfaces smooth.

2n

= 16.

Delphinium nuttallii subsp. ochroleucum

Delphinium robustum

Phenology Flowering late spring. Flowering summer.
Habitat Rock outcrops, rocky meadows Riparian woodlands, subalpine meadows
Elevation 50-100 m [200-300 ft] 2200-3000 m [7200-9800 ft]
Distribution
from FNA
OR
[WildflowerSearch map]
from FNA
CO; NM
[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.)

Of conservation concern.

Delphinium robustum is the representative of the southern Cordilleran complex from the Jemez, San Antonio, San Juan, San Pedro, and Sangre de Cristo mountains. Hybrids are known with D. sapellonis.

(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. ramosum, D. recurvatum, 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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