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Asparagus Pea (Lotus tetragonolobus [syn. Tetragonolobus purpureus]), a quick-growing bushy or low climbing annual with clover-like foliage. The reddish-brown flowers are followed with winged pods said to combine the flavours of pea and asparagus. The pods are eaten entire, ie the peas are not removed for cooking separately. The Winged. Bean (Psophocarpus tetragonolobus) is also known as Asparagus Pea and its fruits are similar, but it has mauve flowers and is a different plant that occurs naturally in tropical Asia and Africa, while. Lotus tetragonolobus is native to southern Europe. lotus-3106htm'>Lotus.