The Flora covers the biogeographic region of the moist, relictual, unglaciated southeastern North America: south of the glacial boundary and east of the “dry line” to the west that marks a marked floristic boundary to the Great Plains prairies to the...

The Neotropics are the most species-rich area of the planet. Understanding the origin and maintenance of this diversity is an important goal of ecology and evolutionary biology. Success in this endeavor relies heavily on the past work of taxonomists...

Plant biodiversity is threatened, yet many species remain undescribed. It is estimated that >50% of undescribed species have already been collected and are awaiting discovery in herbaria. Robust automatic species identification algorithms using...

This is a guide to writing plant names developed for use at The Arboretum at Penn State.

The Checklist is a listing of published names of cultivated magnolias in PDF format.  This new listing is the result of years of effort by Magnolia Society International (MSI) member volunteers. This document serves as a checklist of Magnolia cultivars...

With 90% of its nearly 1,400 native plants classified as endemic, Hawai'i has one of the highest levels of endemism of any floristic region of the world. Although Cyanea is one of the most species-rich flowering plant genera in Hawai'i, nearly half of...

The purpose of these guidelines is to provide a consistent methodology for public garden staff to develop and categorize a list of cultivated taxa observed escaping from their locations of cultivation. The recommendations are meant to guide public...

Mulches provide many benefits for trees and shrubs. Properly applied mulch will moderate soil temperatures, reduce soil moisture loss, reduce soil compaction, provide nutrients, improve soil structure, foster beneficial microbial communities, and keep...

Crop wild relatives, the wild progenitors and closely related cousins of cultivated plant
species, are sources of valuable genetic resources for crop improvement. Persisting gaps
in knowledge of taxonomy, distributions, and...

The Hamamelidaceae has genera with named cultivars, but only one cultivar registration authority for the genus Hamamelis. Choosing the Hamamelidaceae as the focus of this project provides missing information for members of this ornamentally valuable...

The Systematics Collections Committee of the American Society of Plant Taxonomists has updated the recommendations on herbarium practices and ethics that were previously published by the Society in 1958 and 1973. The recommendations and considerations...

This Nomenclature Web Resource Guide was assembled by the Plant Nomenclature & Taxonomy Community.

This is a list of Online Resources for Nomenclatural Verification assembled by the Plant Nomenclature & Taxonomy Community.

This Online Herbaria Guide was assembled by the Plant Nomenclature & Taxonomy Community. It provides a list of herbaria for research purposes. 

The University of British Columbia Botanical Garden compiled a spreadsheet of Collectors' references and expedition abbreviations with associated information that were gathered from various sources (mostly online resources). The spreadsheet is shared...

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. Tree improvement...

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...

This ninth edition of this Code maintains the overall format and style of the eighth (2009) edition and whilst the general order of the Articles remains the same, some alteration to numbering within the Articles has been made to take into account the...

The Standards of Excellence in Plant Collections Management developed by the Plant...