Report on Endangered and Threatened Plant Species of the United States

Taxon ◽  
1975 ◽  
Vol 24 (4) ◽  
pp. 524
Author(s):  
R. S. Cowan
Keyword(s):  
United States ◽  
Plant Species ◽  
The United States ◽  
Threatened Plant ◽  
Threatened Plant Species

Are listed threatened plant species actually at risk?

2002 ◽  
Vol 50 (1) ◽  
pp. 1 ◽  
Author(s):  
Mark A. Burgman
Keyword(s):  
Plant Species ◽  
Threatened Species ◽  
Feedback Loop ◽  
Conservation Status ◽  
The State ◽  
Scarce Resources ◽  
Threatened Plant ◽  
Threatened Plant Species ◽  
Legal Mandates ◽  
State Of The Environment

Despite the fact that the most changes in lists of threatened species reflect changes in knowledge rather than changes in conservation status, the lists continue to provide social and legal mandates for conservation; they are used to report on the state of the environment and to guide the allocation of scarce resources. There is a substantial under-representation of non-vascular species in threatened plant lists, reflected in an absence of documented extinctions among fungi and algae. Turnover in the composition of extinct flora lists in Australia suggests that the lists of threatened species may not be sufficiently reliable to form the basis for reporting on the state of the environment. They are of limited use in distinguishing between levels of threat and may not be a reliable guide for the allocation of scarce conservation resources among plant species. Systems for listing threatened species create a feedback loop, responsive to the subjective preferences of scientists, largely unresponsive to underlying true threats, self-perpetuating and accentuating bias with each iteration. Other tools, including formal decision approaches and the acquisition of new kinds of data, are needed to fill the roles.

Using summed individual species models and state-of-the-art modelling techniques to identify threatened plant species hotspots

2009 ◽  
Vol 142 (11) ◽  
pp. 2501-2509 ◽  
Author(s):  
Miia Parviainen ◽  
Mathieu Marmion ◽  
Miska Luoto ◽  
Wilfried Thuiller ◽  
Risto K. Heikkinen
Keyword(s):  
Plant Species ◽  
State Of The Art ◽  
Individual Species ◽  
Threatened Plant ◽  
Threatened Plant Species ◽  
Modelling Techniques

scholarly journals Uso y manejo de Ibervillea millspaughii (Cogn.) C. Jeffrey, Melothria pendula L. y otras especies silvestres de la familia Cucurbitacea: Posibles procesos de domesticación incipiente

2017 ◽  
pp. 77
Author(s):  
Rafael Lira ◽  
Alejandro Casas
Keyword(s):  
United States ◽  
Traditional Medicine ◽  
Plant Species ◽  
Wild Species ◽  
The United States ◽  
Plant Domestication ◽  
Wild Populations ◽  
Perennial Plant ◽  
Muscular Pain ◽  
Stems And Leaves

Information on use and management of wild species of Cucurbitaceae is presented, in order to analyze processes of incipient plant domestication. Ibervillea millspaughii is a perennial plant species with massive roots, distributed from Tamaulipas to Belize. Roots of this species are utilized as medicine in the treatment of arthritis, inflammations and muscular pain. Roots are commonly collected from individuals in wild populations, but, in some villages of Quinatana Roo people tolerate and enhance individuals of this plant species in anthropogenic areas; also, people cultivate this plant species in home gardens. Melothria pendula is distributed from the United States to Argentina. Fruits and young stems and leaves of this species are consumed as food and used in traditional medicine. These products are generally gathered from wild or weedy populations, but in La Montaña de Guerrero region, the tolerance of this species and the intentional dispersion of its seeds in anthropogenic areas are also common, in order to increase its availability. Use and propagation of this plant species may involve selection by people who distinguish between "bitter" and "sweet" variants, preferring the "sweet" ones. Sicyos parviflorus, Cyclanthera dissecta, C. langaei and C. ribiflora are consumed as greens by people in different regions of Mexico, who gather them from wild or weedy populations, although individual plants of these species are also tolerated in anthropogenic areas. The different forms of management identified in the species mentioned are possibly causing processes of domestication, but such processes are yet to be evaluated.

scholarly journals Alternanthera mosaic virus Found in Scutellaria, Crossandra, and Portulaca spp. in Florida

Plant Disease ◽  
2006 ◽  
Vol 90 (6) ◽  
pp. 833-833 ◽  
Author(s):  
C. A. Baker ◽  
L. Breman ◽  
L. Jones
Keyword(s):  
Electron Microscopy ◽  
United States ◽  
Mosaic Virus ◽  
Plant Species ◽  
The United States ◽  
Enzyme Linked Immunosorbent Assay ◽  
Rt Pcr ◽  
Indicator Plants ◽  
Partial Identity ◽  
Pcr Products

In the fall of 1998, the Division of Plant Industry (DPI) received vegetative propagations of Scutellaria longifolia (skullcap) with symptoms of foliar mosaic, chlorotic/necrotic ringspots, and wavy line patterns from a nursery in Manatee County. Flexuous particles approximately 500 nm long were found with electron microscopy. The plants tested positive for Papaya mosaic virus (PaMV) in an enzyme-linked immunosorbent assay (ELISA) test with antiserum to PaMV (Agdia, Elkhart, IN). However, in immunodiffusion tests (antiserum from D. Purcifull, University of Florida), this virus gave a reaction of partial identity indicating it was related but not identical to PaMV (1). The original infected plants were kept in a greenhouse. In January 2005, a specimen of Crossandra infundibuliformis (firecracker plant) with mosaic symptoms was submitted to the DPI from a nursery in Alachua County. Inclusions found with light microscopy and particles found with electron microscopy indicated that this plant was infected with a potexvirus. This was confirmed by reverse transcription-polymerase chain reaction (RT-PCR) with primers designed to detect members of the virus family Potexviridae (3). These plants reacted positive to PaMV antiserum in ELISA and gave a reaction of partial identity to PaMV in immunodiffusion. A specimen of Portulaca grandiflora (moss rose) with distorted leaves found at a local retail store was also tested and gave the same results. Leaves from each of the three plant species were rubbed onto a set of indicator plants using Carborundum and potassium phosphate buffer. Total RNA was extracted from symptomatic indicator plants of Nicotiana benthamiana. RT-PCR (3) was performed, and PCR products were sequenced directly. Sequences of approximately 700 bp were obtained for all three plant species and showed 98% identity with each other. BLAST search results showed that these sequences were 93% identical to an Alternanthera mosaic virus (AltMV) sequence at the nucleotide level but only 76% identical to PaMV. The amino acid sequences were 98 and 82% identical to AltMV and PaMV, respectively. The PCR products of the virus from Scutellaria sp. were cloned, resequenced, and the sequence was entered into the GenBank (Accession No. DQ393785). The bioassay results matched those found for AltMV in Australia (2) and the northeastern United States (4), except that the Florida viruses infected Datura stramonium and Digitalis purpurea (foxglove). The virus associated with the symptoms of these three plants appears to be AltMV and not PaMV. AltMV has been found in ornamental plants in Australia, Italy, and the United States (Pennsylvania, Maryland, and now Florida). Since this virus is known to infect several plants asymptomatically and can be easily confused with PaMV serologically, it is likely that the distribution of this virus is much wider than is known at this time. References: (1) L. L. Breman. Plant Pathology Circular No. 396. Fla. Dept. Agric. Consum. Serv. DPI, 1999. (2) A. D. W. Geering and J. E. Thomas. Arch Virol 144:577, 1999. (3) A. Gibbs et al. J Virol Methods 74:67, 1998. (4) J. Hammond et al. Arch Virol. 151:477, 2006.

Loss of pathogens in threatened plant species

Oikos ◽  
2010 ◽  
Vol 119 (12) ◽  
pp. 1919-1928 ◽  
Author(s):  
Amanda K. Gibson ◽  
Jorge I. Mena-Ali ◽  
Michael E. Hood
Keyword(s):  
Plant Species ◽  
Threatened Plant ◽  
Threatened Plant Species

Rediscovery of Ophiorrhiza incarnata C.E.C. Fisch. (Rubiaceae) from the Western Ghats of India after a lapse of 83 years

2021 ◽  
Vol 13 (7) ◽  
pp. 18953-18955
Author(s):  
Perumal Murugan ◽  
Vellingiri Ravichandran ◽  
Chidambaram Murugan
Keyword(s):  
Plant Species ◽  
Western Ghats ◽  
Conservation Status ◽  
Type Locality ◽  
Adjacent Area ◽  
Threatened Plant ◽  
Threatened Plant Species ◽  
Western Ghats Of India ◽  
Southern Western Ghats ◽  
The Western Ghats

Ophiorrhiza incarnata C.E.C.Fisch. (Rubiaceae), a threatened plant species of southern Western Ghats is rediscovered from the adjacent area of the type locality after lapse of eight decades.  Its distribution and conservation status are discussed.

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