scholarly journals Grazing of Delphinium occidentale (duncecap larkspur) by susceptible and resistant cattle

2018 ◽  
Vol 34 (6) ◽  
pp. 581-593
Author(s):  
James A. Pfister ◽  
Benedict T. Green ◽  
Dale R. Gardner ◽  
Kevin D. Welch ◽  
Daniel Cook ◽  
...  
Keyword(s):  
Delphinium Occidentale

scholarly journals Pollination Ecology and Breeding System of Delphinium Occidentale

1993 ◽  
Vol 17 ◽  
pp. 87-90
Author(s):  
Ron Scogin
Keyword(s):  
Flower Color ◽  
Pollination Ecology ◽  
Seed Collection ◽  
Local Populations ◽  
Balanced Polymorphism ◽  
Flower Color Polymorphism ◽  
Tall Larkspur ◽  
Alternative Hypotheses ◽  
Flower Form ◽  
Delphinium Occidentale

Delphinium occidentale Nutt. (Ranunculaceae), the tall larkspur, occurs sporatically as isolated local populations in moist locations at lower and middle elevations of Grand Teton National Park. Individual plants of this species exhibit flowers which occur as one of three distinct color morphs and which occur mixed in the local populations. The three floral morphs are 1) plants exhibiting the most familiar, uniformly dark purple pigmented flower form, 2) plants exhibiting an all white, nonpigmented, albino form, and 3) plants whose flowers are intermediate in form between the extremes of 1) and 2), a semi-albino form which exhibits normally pigmented petals, but white, nonpigmented sepals. The occurrence of mixed, polymorphic populations of D. occidentale floral morphs can be rationalized by two alternative hypotheses: 1. A stable, balanced polymorphism exists among the three morphs. This polymorphism is actively maintained by selective pressures, probably on some aspect of the reproductive biology (perhaps pollination ecology) of the floral morphs, or 2. The distribution of polymorphs is merely a founder effect, reflecting the distribution of morphs present in the seed collection which initially established the colonizing population. The research undertaken during 1993 represents an effort to discriminate between these alternative explanations of flower color polymorphism in D. occidentale.

Distribution of Delphinium occidentale chemotypes and their potential toxicity.

2011 ◽  
pp. 606-611
Author(s):  
D. Cook ◽  
D. R. Gardner ◽  
J. A. Pfister ◽  
K. D. Welch ◽  
B. T. Green ◽  
...  
Keyword(s):  
Potential Toxicity ◽  
Delphinium Occidentale

Difficulty in Controlling Duncecap Larkspur (Delphinium occidentale)

1989 ◽  
Vol 3 (2) ◽  
pp. 335-339 ◽  
Author(s):  
Michael H. Ralphs ◽  
David L. Turner
Keyword(s):  
Delphinium Occidentale

Duncecap larkspur was not killed by triclopyr, picloram, or clopyralid applied once at recommended rates. Triclopyr at 1.1, 1.7, 2.2, and 4.6 kg ae/ha applied twice to the same plots in two consecutive years reduced duncecap larkspur density from 29 to 64%. However, the higher rates of triclopyr left 2 plants/m2, an unacceptable level for preventing cattle poisoning.

The Biogeographical Distribution of Duncecap Larkspur (Delphinium occidentale) Chemotypes and Their Potential Toxicity

2009 ◽  
Vol 35 (6) ◽  
pp. 643-652 ◽  
Author(s):  
Daniel Cook ◽  
Dale R. Gardner ◽  
James A. Pfister ◽  
Kevin D. Welch ◽  
Benedict T. Green ◽  
...  
Keyword(s):  
Potential Toxicity ◽  
Biogeographical Distribution ◽  
Delphinium Occidentale

scholarly journals Response of Delphinium occidentale and Associated Vegetation to Aminocyclopyrachlor

2016 ◽  
Vol 69 (6) ◽  
pp. 474-480 ◽  
Author(s):  
Brandon J. Greet ◽  
Brian A. Mealor ◽  
Andrew R. Kniss
Keyword(s):  
Delphinium Occidentale

Development of STS and CAPS markers for identification of three tall larkspurs (Delphinium spp.)

Genome ◽  
2002 ◽  
Vol 45 (2) ◽  
pp. 229-235 ◽  
Author(s):  
Xiaomei Li ◽  
Dale R Gardner ◽  
Michael H Ralphs ◽  
Richard R-C Wang
Keyword(s):  
Rapd Markers ◽  
Poisonous Plants ◽  
Plant Materials ◽  
Sts Markers ◽  
Hybrid Plants ◽  
Tall Larkspur ◽  
Caps Markers ◽  
Species Specific ◽  
Delphinium Occidentale

One cleaved amplified polymorphic sequence (CAPS) and nine sequence tagged site (STS) markers were developed for identifying tall larkspur (Delphinium spp.) plants in three species based on the DNA sequence of known species-specific RAPD markers. Four STS markers were used for identification of Delphinium occidentale, three STS markers for Delphinium barbeyi, and one CAPS and two STS markers for Delphinium glaucum. One hundred sixty-six individual plants collected at 19 locations in the western U.S.A. were tested using the STS and CAPS markers. Over 95% of the D. occidentale plants contained all four D. occidentale specific STS markers, whereas the remaining plants contained three of the four STS markers. Approximately 97% of D. barbeyi plants contained all three D. barbeyi specific STS markers, and the rest had two of the three STS markers. A small percentage of D. barbeyi plants contained one D. occidentale specific STS marker. Hybrid populations were characterized as having more D. occidentale specific than D. barbeyi specific STS markers, suggesting that the three hybrid populations are composed not of F1 hybrid plants of the parental species but of segregating offspring of different generations from original hybrids. This set of STS and CAPS markers for larkspur species should be useful in classification of unknown plant materials and the identification of hybrid populations.Key words: poisonous plants, RAPD, molecular marker, PCR.

Herbicidal Control of Duncecap Larkspur (Delphinium occidentale)

Weed Science ◽  
1990 ◽  
Vol 38 (2) ◽  
pp. 153-157 ◽  
Author(s):  
Larry V. Mickelsen ◽  
Michael H. Ralphs ◽  
David L. Turner ◽  
John O. Evans ◽  
Steven A. Dewey
Keyword(s):  
Grass Cover ◽  
Poisonous Plant ◽  
Reduced Density ◽  
Delphinium Occidentale

Several herbicides were evaluated for their ability to control duncecap larkspur, a serious poisonous plant on mountain rangelands in the western U.S. Duncecap larkspur density was reduced from 33 to 93% by triclopyr applied at 2.2, 4.5, and 9.0 kg ae/ha. Picloram applied at 2.2 and 4.5 kg ae/ha reduced density from 33 to 99%. Metsulfuron applied at 86 and 138 g ai/ha reduced density from 50 to 98%. Glyphosate was the most effective herbicide, reducing density by 90 to 100% when applied at 2.2 kg ai/ha. Glyphosate reduced the cover of grasses and perennial forbs but increased cover of annual forbs. All rates of picloram and metsulfuron reduced forb cover. Grass cover increased in most plots where duncecap larkspur and forbs were reduced.

scholarly journals Aspects of the Pollination Ecology of Selected Native Flora in Grand Teton National Park

1984 ◽  
Vol 8 ◽  
pp. 71-72
Author(s):  
Ron Scogin
Keyword(s):  
National Park ◽  
Pollination Ecology ◽  
Research Center ◽  
Grand Teton National Park ◽  
Native Flora ◽  
Color Morphs ◽  
Preliminary Study ◽  
Delphinium Occidentale

My investigations during July and August, 1984 at the U.W.-N.P.S. Research Center had two primary objectives, both involving problems of pollination ecology of flora native to Grand Teton National Park: 1. A survey of the distribution of floral coloration on a community basis within the park; and 2. A preliminary study of the pollination ecology of the color morphs of Delphinium occidentale (Ranunculaceae).

Sign in / Sign up

Export Citation Format

Share Document