This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Seaside, Sea, or Everlasting Pea.
Lathyrus maritimus. Pulse Family. May - Aug.
Found chiefly near seashores from New Jersey and Oregon to the Arctic Sea; also shores of Great Lakes.
Purple, about 1 inch long or less, 5 - 12 in short clusters on stalk springing from the leaf angles.
Compound, consisting of 6 - 10 leaflets. A pair of arrowhead-shaped leaflets are borne at the base of the compound leaves. Plant stem stout, reclining, 1 - 2 feet long.
 
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