The Internet Orchid Species Photo Encyclopedia is a sprawling independently maintained reference with more than 26,000 orchid species, photographs, drawings, synonyms and linked botanical references.
Gernot Katzer's Spice Pages document 117 spice plants with culinary use, history, chemistry, etymology, photographs, geography, botany, and more than 10,000 names across dozens of languages.
ForagingPictures.com organizes 1,581 photographs of 237 plants and mushrooms from 30 New York-area wild-food tours, with seasonal tour indexes, location tables, plant counts, and edible, medicinal, poisonous, and mushroom categories.
SeedBiology.de functions as a specialist academic shelf for research on seed germination, dormancy, physiology, and plant-development questions, preserving papers and scientific material outside the usual journal-search workflow.
Thomas J. Elpel's Wildflowers and Weeds site has been publishing plant-identification material since the 1990s, teaching readers to recognize botanical families through recurring patterns instead of memorizing thousands of isolated species.
Adam Schneider's personal photo site organizes years of wildflower photography by trip, date, location, species, and searchable text instead of throwing the collection into a social feed.
Subhuti Dharmananda's old ITM Online article on luo han guo became the kind of plain web reference that kept turning up years later in papers, reviews, and regulatory material about monk fruit.
British-Wild-Flowers.co.uk began in 2003 and grew into a collaborative photographic reference covering more than 2,000 plant species across Britain and Ireland.
MissouriPlants.com organizes the state's wild vascular flora by flower color, leaf arrangement, family and scientific name, with photographs, conservation values and identification notes aimed at non-specialists.
Ways of Enlichenment combines lichen philosophy, identification tools and a photogallery containing 11,593 vetted images representing 2,183 species across western North America.
UW-Madison's Virtual Foliage site preserves classroom botany collections assembled from faculty, student and donated slide archives, including Wisconsin trees, fungi and plant diversity material.