Butterbean (P. lunatus) - The Butterbean, also known as Sieva, Civet, or Seewee Bean are popular in the South, where they are staple hot-weather vegetables. Butterbeans are similar to Lima Beans but smaller and slightly more heat-resistant. There are climbing and bush varieties. Some produce seeds that have brown and maroon blotches when dry. Except when very small, these blotches turn dark when cooked. In the past, most Butterbeans were mainly white-seeded. There are now kinds with green immature seeds.
Lima Bean (P. limensis) - There is very little difference between the Butterbean and the Lima Bean as crosses are made. Lima plants grow either bushy or climbing. Lima Beans are larger and more vigorous than Butterbeans and they produce large pods with chubby, greenish seeds. Limas are less heat resistant than Butterbeans, however, the larger, thicker pods are easier to shell and the green beans are appetizing fresh or dried.