(Texas A & M University. Press, 2005) Lehman, Roy L.
Four color photographs of Strophostyles helvula, (also known as wild bean), an annual vine from the Pea family found on the barrier islands and along bay beaches.
(Texas A & M University. Press, 2005) Lehman, Roy L.
One color photograph of Vicia ludoviciana, (also known as deer pea vetch), an annual vine from the Pea family found on various soils in prairies, openings, and waste places.