List of plant species (over 28,000 names) that have been cited in specific references as weeds. Additional information may be available, such as native range, whether the plant has reported medical/herbal uses, etc.
Provides information on the classification, structural features, natural history, ecology and evolutionary relationships of bryophytes (mosses, liverworts and hornworts).
Provides biodiversity knowledge about all known species, including their taxonomy, geographic distribution, collections, genetics, evolutionary history, morphology, behavior, ecological relationships, and importance for human well being.
Flora of the vascular plants of the Canadian Arctic Archipelago with images, maps and information on place of valid publication, synonymy, common names, vegetative and floral morphological characters, distribution, habitat, ecology, indigenous knowledge, and economic uses, etc.
The PLANTS Database provides standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories.
Collection of information about biodiversity compiled collaboratively by hundreds of expert and amateur contributors. Contains pictures, text, and other information for species living or extinct and the hierarchy of life, phylogeny and evolution.
Images from hundreds of species of plants from all over the world. The images are digitized micrographs of parts of plants that were sectioned, stained, and permanently mounted to a glass slide.
"The Index contains entries dealing with various aspects of extant and fossil North and South American plants and fungi, including systematics and floristics, morphology, and ecology, as well as economic botany and general botany."
Information on the names, taxonomic relationships, continent-wide distributions, and morphological characteristics of all plants native and naturalized found in North America north of Mexico
research article and scientific journal archive of innspub in Fisheries, Genetics, Biochemistry, Plant Physiology, Biotechnology, Microbiology, Cell Biology,