Dalrymple vigna

Vigna luteola, commonly known as hairypod cowpea or dalrymple vigna, is a herbaceous perennial vine in the family Fabaceae with a pantropical distribution in coastal and wetland habitats of the Americas, Africa, Asia, and Pacific islands including Hawaii. The plant develops from a deep taproot and produces twining or trailing stems 1 to 3 metres long that are clothed in stiff appressed hairs. Leaves are alternate and trifoliate, with three ovate to lanceolate leaflets 3 to 8 centimetres long, somewhat hairy, with a pair of small lateral stipels at each leaflet base. Yellow papilionaceous flowers, 1.5 to 2 centimetres long, are borne in axillary racemes on long peduncles that overtop the foliage; the standard petal is bright yellow with reddish or brownish markings on the back. The fruit is a flattened, hairy legume 3 to 6 centimetres long containing several mottled brown seeds. The species frequents marshes, dune swales, ditches, and brackish shores.