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Ulmus americana (American elm) was an important urban tree in North America prior to the introduction of the Dutch elm disease pathogen in 1930. Subsequently, urban and community forests were devastated by the loss of large canopies.
This article covers tests conducted to better understand spatial and climatic patterns of diversification in the Orchidaceae, an angiosperm family characterized by high levels of species diversity and rarity.
Access and benefit-sharing (ABS) refers to the way in which genetic resources
may be accessed, and how the benefits that result from their use are shared
between the people or countries using the resources (users) and the people or
Originating in Europe in the 16th century, botanic gardens are found in nearly every country in the world.
Cycads are the most endangered of plant groups based on IUCN Red List assessments; all are in Appendix I or II of CITES, about 40% are within biodiversity ‘hotspots,’ and the call for action to improve their protection is longstanding.
Botanical gardens devote their resources to the study and conservation of plants, as well as making the world's plant species diversity known to the public. These gardens also play a central role in meeting human needs and providing well-being.
Early botanic gardens served medicine, and then they became important for
biological research as well as for the transfer of crop species around the globe.
Genetic diversity provides the essential basis for the adaptation and resilience of tree species to environmental stress and change.
Selecting the geographic origin—the provenance—of seed is a key decision in restoration. The last decade has seen a vigorous debate on whether to use local or nonlocal seed.