1Thomas Jefferson to Joseph C. Cabell, 13 July 1816 (Jefferson Papers)
thinks the Cockspur hawthorn (our common one) would be preferable as being stronger...
2Thomas Jefferson to Thomas Main, 20 January 1810 (Jefferson Papers)
agriculture; and hawthorn hedges [index entry] hawthorn [index entry]
3Memorandum Books, 1771 (Jefferson Papers)
...Cherry. F. Cerasus. 5.—Clethra—Cockspur hawthorn, or haw. Crataegus. 4.—Laurel.—Scorpion Sena...