Astragalus glyciphyllus (Sweet Milk Vetch) .
"Handbook to the Severn Valley Railway Illustrative and Descriptive of Places along the Line from Worcester to Shrewsbury" by J. Randall
Stock eat vetch hay greedily, and this hay increases the flow of milk in dairy animals and helps to keep animals fat and sleek.
"Agriculture for Beginners" by Charles William Burkett
The diet should be mainly albuminous, such as wheat bran or middlings, peas, beans, vetches, and milk.
"Special Report on Diseases of the Horse" by United States Department of Agriculture
The caterpillars feed upon the leaves of oak and Astragalus or milk vetch.
"Butterflies Worth Knowing" by Clarence M. Weed