We have information from several sources:
Legume Species as Leaf VegetablesRobert P. Barrett
Utility of Cowpea Foliage in a Crop Production System for SpaceDavid L. Bubenheim, Cary A. Mitchell and Suzanne S. Nielsen
Plant Nutrient Composition Altered With Controlled Environments for Future Space Life-Support SystemsS. Suzanne Nielsen, Martha A. Belury, Kwangok P. Nickel, and Cary A. Mitchell
CowpeaAlternative Crop Guide
CowpeaAlternative Field Crops Manual, University of Wisconson Cooperative Extension Service, University of Minnesota Extension Service, Center for Alternative Plant & Animal Products
New Opportunities in VignaRichard L. Fery
Neglected Crops: 1492 from a Different PerspectiveJ.E. Hernándo Bermejo and J. León (eds.)
Handbook of Energy CropsJames A. Duke. 1983. unpublished.
Food and feed crops of the United StatesMagness, J.R., G.M. Markle, C.C. Compton. 1971.
As hay, pasture, and soil improvement crop:
Food and feed crops of the United StatesMagness, J.R., G.M. Markle, C.C. Compton. 1971.
Outside Links:
LegumeFAO/IBPGR Technical Guidelines for the Safe Movement of Legume GermplasmLink to the publication on the International Plant Genetic Resources Institute web site