Fruits of warm climates 2003. Classical source by J.F. Morton for major and minor tropical fruits.

Famine Foods Website. Comprehensive and searchable global inventory of famine species, i.e. mostly wild plants used in times of food shortages, compiled by Robert L. Freedman.

Publications of Bioversity International (formerly IPGRI) on underutilised crops:

• Physic nut – Jatropha curcas
• Yam bean – Pachyrhizus
• Coriander – Coriandrum sativum
• Hulled Wheat – Triticum spp.
• Niger – Guizotia abyssinica
• Pili nut – Canarium ovatum
• Safflower – Carthamus tinctorius
• Chayote – Sechium edule
• Bambara groundnut – Vigna subterranean
• Breadfruit – Artocarpus altilis
• Cat’s whiskers – Cleome gynandra
• Tef – Eragrostis tef
• Sago palm – Metrocylon sagu
• Oregano
• Black nightshades – Solanum nigrum and related species
• Traditional African vegetables
• Carob tree – Ceratonia siliqua
• Grass pea – Lathyrus sativus
• Buckwheat – Fagophyrum esculentum
• Peach palm – Bactris gasipaes
• Andean roots and tubers: Ahipa, arracacha, maca and yacon
• Maca – Lepidium meyenii

Multilingual Multiscript Plant Name Database. Extensive database on common names of useful plants in many languages and different scripts.

Advances in New Crops. Proceedings of US New Crops Symposia (1993-2007).

Underexploited Tropical Plants with Promising Economic Value. A classical 1975 publication of the US National Academy of Sciences.

Gernot Katzer’s Spice Pages. Essential information on the history, chemical constituents, and the etymology of 120 spice species, predominantly from Asia.

Leon J. 1987. Botánica de los cultivos tropicales.

Plant Resources of Africa. Illustrated multi-volume encyclopedia of the useful plants of tropical Africa, texts retrievable via Protabase or PROTA4U.

Lost Crops of Africa. Three volumes available as free pdf: grains (vol. 1), vegetables (vol. 2) and fruits (vol. 3). Available in partial view on Google Books.

Plantas cultivadas y animales domésticos en América equinoccial. Although published back in the 1960s, this seminal series of monographs on “cultivated plants and domesticated animals in tropical America” has not been superseded.

Lost Crops of the Incas. An influential 1989 book, available as free pdf, on “little-known plants of the Andes with promise for worldwide cultivation”. Also downloadable from Google Books.

Neglected crops: 1492 from a different perspective. Edited by Bermejo and Leon in 1994, this book deals with crops from South America.

New World Fruits Database. Compilation of over 1200 species (in approx. 300 genera and 70 families) used for their edible fruits in North and South America, providing basic information nomenclature, taxonomy, common names, fruit and plant uses, distribution and origin, with links to additional information, such as experts working on the different species, references and URLs (compiled by Bioversity, CIRAD and CIAT).

Plant Resources of South-East Asia (PROSEA). A monumental series of 19 printed volumes of useful plants, searchable at E-PROSEA, some volumes available in partial view on Google Books.

Specialty Crops for Pacific Island Agroforestry. Monographs of crops for use in the Pacific including native species such as aroids, breadfruit and kava.

Edible fruits of the Himalayas.