Delphinium nuttallii subsp. nuttallii(synonym of Delphinium oreganum) |
Delphinium polycladon |
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Willamette Valley larkspur |
high mountain larkspur, mountain marsh larkspur |
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Stems | 40-70 cm. |
(20-)60-100(-160) cm; base reddish or not, glabrous. |
Leaves | blade round to pentagonal, 1.5-7 × 2-14 cm, glabrous; ultimate lobes 3-12, width 4-30(-45) mm (basal), 3-30 mm (cauline). |
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Inflorescences | 3-15(-35)-flowered, open, often ± secund; pedicel 1-4(-15) cm, glabrous to puberulent; bracteoles 2-8(-37) mm from flowers, green, linear, 4-7(-11) mm, nearly glabrous. |
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Flowers | sepals blue or bluish purple, spurs 10-13 mm; lower petal blades 4.5-6.5 mm. |
sepals bluish purple, nearly glabrous, lateral sepals spreading, (10-)12-18 × 7-10 mm, spurs usually downcurved, ca. 30° below horizontal, 11-22 mm; lower petal blades slightly elevated, ± exposing stamens, 4-6 mm, clefts 1-2 mm; hairs mostly near base of cleft on inner lobes, yellow, sometimes white. |
Fruits | 13-20 mm, 3.5-4 times longer than wide, puberulent. |
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Seeds | unwinged; seed coat cells with surfaces roughened. |
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2n | = 16. |
= 16. |
Delphinium nuttallii subsp. nuttallii |
Delphinium polycladon |
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Phenology | Flowering late spring–early summer. | Flowering summer–early autumn. |
Habitat | Rock outcrops, rocky meadows | Wet sites near springs, streamsides, bogs, and wet talus |
Elevation | 20-300 m (100-1000 ft) | 2200-3600 m (7200-11800 ft) |
Distribution |
OR; WA |
CA; NV
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Discussion | Delphinium polycladon hybridizes with D. depauperatum and D. glaucum. Plants of D. polycladon are extremely variable. Individuals from very rocky, thin-soiled, sunny sites at higher elevations tend to be quite compact; they show the features of the species in a dwarfed state. Proximal internodes are especially shortened. Plants from areas of deeper soil (high or low elevations), especially those growing among shrubs, usually are much taller, with elongate proximal internodes, and other vegetative parts proportionally larger. Shorter plants may be confused with D. depauperatum or D. nuttallianum; see discussion under those species for distinguishing features. Taller plants may be confused with D. glaucum; they can be distinguished by their leaves predominately on proximal part of stem, sigmoid pedicel, and fewer flowers. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Grumosa > Delphinium nuttallii | Ranunculaceae > Delphinium > sect. Diedropetala > subsect. Multiplex |
Sibling taxa | ||
Synonyms | D. scopulorum var. luporum | |
Name authority | unknown | Eastwood: Bull. Torrey Bot. Club 28: 669. (1901) |
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