The Pinetree Seed Catalogue (a US company) states about Masai beans (I misspelled it in previous, sorry)
"Small plants produce huge yields of thin, smooth, flavorful beans. Plants are only about a foot tall but are covered with 4 inch long beans, a couple dozen per plant. Several plants will provide a meal for two and due to the growth habit the harvest is quick and easy. The best bean we know of for container growing and a great choice for late summer planting. The fall yields appear to be almost as heavy as those we got in the summer."
It could well be the same thing as Kenya beans. I'll take a pix today and post (if I can get Photobucket to perform dutifully)