Flora of North America species comparison

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Delphinium basalticum

Delphinium sect. Diedropetala
Delphinium basalticum

basalt larkspur, basaltic larkspur, Columbia Gorge larkspur
Roots

2-80 cm, tuberlike or fibrous, dry or fleshy;

buds often less than 3 mm.
Stems

20-50(-65) cm;

base often reddish, puberulent.

1-8(-19) per root;

base firmly attached to root or not.
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).

cauline and/or in basal rosette, gradually or abruptly reduced into bracts.
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 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.

sepals blue, purple, white, red, or yellow;

lower petal blades often same color as lateral sepals, usually greater than 1/5 length of lateral sepals (exceptions in red- and yellow-flowered species).
Fruits

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

Seeds

± wing-margined;

seed coat cells with surfaces smooth.

Delphinium basalticum

Delphinium sect. Diedropetala
Phenology Flowering spring (-early summer).
Habitat Basaltic cliff faces, n and e slopes at base of cliffs
Elevation 200-500 m (700-1600 ft)
Distribution
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, p. 197.
Parent taxa Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Bicoloria Ranunculaceae > Delphinium
Sibling taxa
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
Subordinate taxa
Name authority M. J. Warnock: Phytologia 78: 91. (1995) Huth: Bot. Jahrb. Syst. 20: 420. (1895)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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