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Delphinium barbeyi
Conservation status
Apparently Secure  (NatureServe)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Ranunculales
Family:	Ranunculaceae
Genus:	Delphinium
Species:	D. barbeyi
Binomial name
Delphinium barbeyi (Huth) Huth

Delphinium barbeyi is a species of flowering plant in the buttercup family known by the common names subalpine larkspur, tall larkspur, and Barbey's larkspur. It is native to the interior western United States, where it occurs in the states of Arizona, Colorado, New Mexico, Utah, and Wyoming.

This species is a perennial herb growing up to 1.5 meters tall. The leaves line the stem but disappear from the lowest part of the stem by the time the plant blooms. The leaves are somewhat rounded in outline and are divided into several lobes. The tall inflorescence bears up to 50 flowers at a time, but a plant may produce hundreds of flowers. Each is borne on a pedicel up to 6 centimeters long. The flower has five dark purple-blue sepals with whitish or yellowish hairs inside. The fruit is a follicle up to 2.2 centimeters long.

The plant is long-lived, capable of exceeding 75 years of age.

It occupies wet habitat types in subalpine and alpine climates. It is a dominant member of the herb layer in many places. It can often be found growing beneath aspens.

This Delphinium commonly hybridizes with its relative, Delphinium glaucum. Hybrids may be more common in the habitat than individuals of the parent species. The hybrid is sometimes called the duncecap larkspur (Delphinium × occidentale). D. barbeyi also hybridizes with Delphinium ramosum and D. sapellonis.

Bumblebees and hummingbirds use the nectar from the flowers. The bee species Bombus nevadensis, Bombus insularis, Bombus appositus and B. flavifrons and the hummingbirds Selasphorus platycercus, S. rufus, and Stellula calliope have been observed. Both types of pollinators prefer the larkspurs with the largest flower displays. The sphinx moth Hyles lineata and anthomyiid flies also visit the flowers.

All members of the genus Delphinium are toxic to humans and livestock. Many species of larkspurs are known for being poisonous, and as hazards to livestock. This species is notorious as one of the toxic plants most commonly responsible for livestock death, especially cattle fatalities on the rangelands of Colorado and Utah. Sheep are much less susceptible. Up to 15% of a cow herd can be lost to poisoning in areas where this larkspur and its hybrids are common. The cost to ranchers is in the millions of dollars. Abundance of larkspur has persuaded ranchers to remove their animals from some areas of rangeland, or use the land only at certain times of the year. The plant contains many toxic alkaloids. The alkaloids barbinine and barbinidine were first isolated from this species. The most hazardous are called (methylsuccinimido) anthranoyllycoctonine (MSAL) diterpenoids. About two kilograms dry weight of the plant is estimated to provide a fatal dose of alkaloid. Paralysis occurs and death is caused by respiratory paralysis. Toxicity reactions in animals, sometimes called larkspur toxicosis, can be treated with physostigmine.

Ranchers sometimes attempt to kill this larkspur with the herbicide tebuthiuron. Glyphosate and picloram have been effective in research trials, but these chemicals kill nontarget plants as well, accelerating the invasion of weeds into the habitat.

References

1. "Delphinium barbeyi". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 23 January 2018.
2. ^ "Delphinium barbeyi". Flora of North America.
3. ^ Williams, C. F. (2007-10-01). "Effects of floral display size and biparental inbreeding on outcrossing rates in Delphinium barbeyi (Ranunculaceae)". American Journal of Botany. 94 (10): 1696–1705. doi:10.3732/ajb.94.10.1696. ISSN 0002-9122. PMID 21636366.
4. "Delphinium barbeyi". Rocky Mountain Biological Laboratory. Archived from the original on 2013-07-02. Retrieved 2013-05-08.
5. Pfister, James A; Ralphs, Michael H; Gardner, Dale R; Stegelmeier, Bryan L; Manners, Gary D; Panter, Kip E; Lee, Steven T (2002). "Management of three toxic Delphinium species based on alkaloid concentrations". Biochemical Systematics and Ecology. 30 (2): 129–138. doi:10.1016/s0305-1978(01)00124-7. ISSN 0305-1978.
6. Matthews, R. F. (1993). "Delphinium × occidentale". Fire Effects Information System. USDA, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory.
7. Inouye, David W.; Morales, Manuel A.; Dodge, Gary J. (2002). "Variation in timing and abundance of flowering by Delphinium barbeyi Huth (Ranunculaceae): the roles of snowpack, frost, and La Niña, in the context of climate change". Oecologia. 130 (4): 543–550. Bibcode:2002Oecol.130..543I. doi:10.1007/s00442-001-0835-y. ISSN 0029-8549. JSTOR 4223203. PMID 28547255. S2CID 57592.
8. Elliott, Susan E.; Irwin, Rebecca E. (2009). "Effects of flowering plant density on pollinator visitation, pollen receipt, and seed production in Delphinium barbeyi (Ranunculaceae)". American Journal of Botany. 96 (5): 912–919. doi:10.3732/ajb.0800260. ISSN 0002-9122. PMID 21628244.
9. Karen Wiese (2013). Sierra Nevada Wildflowers: A Field Guide to Common Wildflowers and Shrubs of the Sierra Nevada, including Yosemite, Sequoia, and Kings Canyon National Parks. Falcon Guides. p. 52. ISBN 978-1-4930-0266-5.
10. Ralphs, M. H.; Gardner, D. R.; Turner, D. L.; Pfister, J. A.; Thacker, E. (2002). "Predicting toxicity of tall larkspur (Delphinium barbeyi): measurement of the variation in alkaloid concentration among plants and among years". Journal of Chemical Ecology. 28 (11): 2327–2341. doi:10.1023/a:1021013719206. ISSN 0098-0331. PMID 12523572. S2CID 24632700.
11. Ralphs, M. H.; Bowns, J. E.; Manners, G. D. (1991). "Utilization of Larkspur by Sheep". Journal of Range Management. 44 (6): 619–622. doi:10.2307/4003048. hdl:10150/644803. ISSN 0022-409X. JSTOR 4003048.
12. ^ Pfister, James A.; Ralphs, Michael H.; Manners, Gary D.; Gardner, Dale R.; Price, Kermit W.; James, Lynn F. (1997). "Early Season Grazing by Cattle of Tall Larkspur-(Delphinium spp.) Infested Rangeland". Journal of Range Management. 50 (4): 391–398. doi:10.2307/4003306. hdl:10150/644081. ISSN 0022-409X. JSTOR 4003306.
13. ^ Pfister, James A.; Manners, Gary D.; Gardner, Dale R.; Ralphs, Michael H. (1994). "Toxic Alkaloid Levels in Tall Larkspur (Delphinium Barbeyi) in Western Colorado". Journal of Range Management. 47 (5): 355–358. doi:10.2307/4002329. hdl:10150/644489. ISSN 0022-409X. JSTOR 4002329.
14. Pelletier, S.William; Kulanthaivel, Palaniappan; Olsen, John D. (1989). "Alkaloids of Delphinium barbeyi". Phytochemistry. 28 (5): 1521–1525. doi:10.1016/s0031-9422(00)97779-3. ISSN 0031-9422.
15. Pfister, JA; Panter, KE; Manners, GD; Cheney, CD (1994). "Reversal of tall larkspur (Delphinium barbeyi) poisoning in cattle with physostigmine". Veterinary and Human Toxicology. 36 (6): 511–4. PMID 7900266.
16. ^ Ralphs, Michael H.; Woolsey, Lee; Bowns, James E. (2004). "Individual Plant Control of Tall Larkspur (Delphinium barbeyi) with Tebuthiuron". Weed Technology. 18 (2): 248–251. doi:10.1614/wt-03-027r2. ISSN 0890-037X. JSTOR 3989211. S2CID 86223556.
17. Ralphs, Michael H.; Turner, David L.; Mickelsen, Larry V.; Evans, John O.; Dewey, Steven A. (2017-06-12). "Herbicides for Control of Tall Larkspur (Delphinium barbeyi)". Weed Science. 38 (6): 573–577. doi:10.1017/S0043174500051511. ISSN 0043-1745. JSTOR 4045077. S2CID 82201592.

• NatureServe apparently secure species
• Delphinium