scholarly journals Vascular plant extinction in the continental United States and Canada

2020 ◽  
Author(s):  
Wesley M. Knapp ◽  
Anne Frances ◽  
Reed Noss ◽  
Robert F. C. Naczi ◽  
Alan Weakley ◽  
...  
Keyword(s):  
United States ◽  
Vascular Plant ◽  
Plant Extinction

scholarly journals New reports of nuclear DNA content for 407 vascular plant taxa from the United States

2012 ◽  
Vol 110 (8) ◽  
pp. 1623-1629 ◽  
Author(s):  
Chengke Bai ◽  
William S. Alverson ◽  
Aaron Follansbee ◽  
Donald M. Waller
Keyword(s):  
United States ◽  
Dna Content ◽  
Nuclear Dna ◽  
Vascular Plant ◽  
Nuclear Dna Content ◽  
The United States

A Remarkably Reduced Vascular Plant in the United States

Science ◽  
1963 ◽  
Vol 142 (3598) ◽  
pp. 1483-1484 ◽  
Author(s):  
W. H. Wagner ◽  
A. J. Sharp
Keyword(s):  
United States ◽  
Vascular Plant ◽  
The United States

scholarly journals The vascular flora of Choctaw County, Mississippi, U.S.A.

2019 ◽  
Vol 13 (1) ◽  
pp. 319-348
Author(s):  
Kevin D. Philley
Keyword(s):  
United States ◽  
Plant Communities ◽  
Vascular Plant ◽  
The United States ◽  
The State ◽  
Eastern United States ◽  
Central Plateau ◽  
Vascular Flora ◽  
Floristic Survey ◽  
The North

The state of Mississippi is one of the least botanically explored areas in the eastern United States. A floristic survey of Choctaw County, Mississippi, was conducted from November 2009 through November 2017 in order to document the vascular flora and describe its plant communities. The county is located in the central portion of the state within the North Central Plateau physiographic region, an area dominated by dissected uplands with acidic to circumneutral sandy-clay soils. Three major river basins occur in the county, including the Big Black River, Noxubee River, and Pearl River. A total of 950 vascular plant species (958 taxa including varieties, subspecies, and recognized hybrids) was recorded. Three-hundred thirteen of these taxa were new county records. Twenty-eight species of special concern as designated by the Mississippi Natural Heritage Program were documented. Approximately 15 percent of the flora is considered non-native to the United States. Eight primary plant communities are also described.

scholarly journals Notes on vascular plant type collections of Cyrus G. Pringle in western United States and Mexico, 1881–1884

2017 ◽  
Vol 11 (1) ◽  
pp. 117-120
Author(s):  
Kathryn Mauz
Keyword(s):  
United States ◽  
Vascular Plant ◽  
Western United States ◽  
Plant Type ◽  
The Pacific ◽  
Pacific Slope ◽  
Northwestern Mexico

Botanist Cyrus G. Pringle collected plants in the western United States and northwestern Mexico between 1881 and 1884, and distributed his specimens as ‘Flora of the Pacific Slope’. The majority of the vascular plant type collections resulting from that work have been discussed elsewhere. This note addresses type status for five additional names that were previously overlooked in Pringle’s catalogue for Arizona and California.

Application of a Simple Cold Stub to the Direct Observation of Frozen Hydrated Sand

1973 ◽  
Vol 31 ◽  
pp. 212-213
Author(s):  
John M. Wehrung ◽  
Richard J. Harniman
Keyword(s):  
United States ◽  
Surface Water ◽  
Direct Observation ◽  
Controlled Study ◽  
Clay Particles ◽  
Organic Debris ◽  
Rock Formations ◽  
Water Tables ◽  
Permeable Rock ◽  
Natural Means

Water tables in aquifer regions of the southwest United States are dropping off at a rate which is greater than can be replaced by natural means. It is estimated that by 1985 wells will run dry in this region unless adequate artificial recharging can be accomplished. Recharging with surface water is limited by the plugging of permeable rock formations underground by clay particles and organic debris.A controlled study was initiated in which sand grains were used as the rock formation and water with known clay concentrations as the recharge media. The plugging mechanism was investigated by direct observation in the SEM of frozen hydrated sand samples from selected depths.

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