Flora of North America species comparison

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Delphinium uliginosum

royal larkspur

swamp larkspur

Stems

(10-)20-50(-80) cm;

base reddish or not, not longitudinally ridged, long-pubescent.

10-30(-70) cm;

base reddish or not, nearly glabrous.

Leaves

blade round to pentagonal, 1-4.5 × 2-6 cm, pubescent; ultimate lobes 3-15, width 3-8 mm (basal), 2-5 mm (cauline).

blade obdeltoid, apically several parted, 1-8 × 1-7 cm, ± fleshy, glabrous; ultimate lobes 0-3, width 3-20 mm (cauline only);

margins of basal leaf, measured less than 1 cm from blade base, demarcating less than 90° of arc when leaf laid flat.

Inflorescences

(4-)6-17(-20)-flowered, open;

pedicel 0.5-3(-7) cm, usually puberulent;

bracteoles 2-7(-23) mm from flowers, green, linear-lanceolate, 3-8 mm, puberulent.

5-20(-48)-flowered, ± open;

pedicel 0.3-3(-10) cm, glabrous to puberulent;

bracteoles 2-3(-5) mm from flowers, green to blue, lanceolate-linear, 3-4(-7) mm, puberulent.

Flowers

sepals usually deep royal blue, sometimes bright blue to light blue or white, ± finely pubescent, lateral sepals spreading, 10-18(-25) × 6-10 mm, spurs straight, ascending ca. 30° above horizontal, 10-19 mm;

lower petal blades slightly elevated, ± exposing stamens, 4-11 mm, clefts 0.5-3.5 mm;

hairs sparse, more on inner lobes than outer lobe or centered, scattered on margins, white or yellow.

sepals dark blue, nearly glabrous, lateral sepals spreading, 9-15 × 5-8 mm, spurs usually upcurved, ascending 30-45° above horizontal, 10-14 mm;

lower petal blades slightly elevated, ± exposing stamens, 4-5 mm, clefts 2-3 mm;

hairs centered, densest on inner lobe above base of cleft, also on margins, white.

Fruits

9-19 mm, 2.2-3.8 times longer than wide, ± puberulent.

10-18 mm, 4.1-4.5 times longer than wide, puberulent.

Seeds

not echinate, appearing ± smooth to naked eye;

seed coat cells with margins ± undulate, surfaces roughened.

seed coat cells with surfaces bumpy or wavy.

= 16.

Delphinium variegatum

Delphinium uliginosum

Phenology

Flowering late spring–early summer.

Habitat

Serpentine streamsides, chaparral, grassland

Elevation

400-600 m (1300-2000 ft)

Distribution

[WildflowerSearch map]

[BONAP county map]

[WildflowerSearch map]

[BONAP county map]

Discussion

Subspecies 3 (3 in the flora).

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

Although some populations are large, Delphinium uliginosum is very local. Hybrids with D. hesperium subsp. pallescens have been seen.

Delphinium uliginosum is a very distinctive species, not likely to be confused with any other. The fan-shaped, slightly dissected leaves are apparently unique in the genus.

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

Key

1. Long hairs dense on base of stem; sepals usually deep royal blue; mainland.	subsp. variegatum
1. Long hairs sparse on proximal portion of stems; sepals white to bright blue; islands.	→ 2
2. Sepals bright blue to light blue.	subsp. thornei
2. Sepals white to light blue.	subsp. kinkiense

Source

FNA vol. 3.

Parent taxa

Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Echinata

Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Depauperata

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. 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. robustum, D. sapellonis, D. scaposum, D. scopulorum, D. stachydeum, D. sutherlandii, D. treleasei, D. tricorne, D. trolliifolium, D. umbraculorum, D. variegatum, D. viridescens, D. wootonii, D. xantholeucum

Subordinate taxa

D. variegatum subsp. kinkiense, D. variegatum subsp. thornei, D. variegatum subsp. variegatum

Name authority

Torrey & A. Gray: Fl. N. Amer. 1: 32. 183: not D. variegatum Baillon 1883

Curran: Proc. Calif. Acad. Sci. 1: 151. (1885)

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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