这个我以前也有过疑问,网上是这么说的:
on page 256 of Edible Wild Plants of Eastern North America by Merritt
Fernald and Alfred Kensey they report:
"The ornamental hyachinth bean, with showy purple or white flowers in long
and interrupted spike-like clusters and large pods about one inch broad, is
cultivated chiefly for ornament southward and has escaped to roadsides and
thickets northwards to the District of Columbia and Ohio. In the Far East,
where it is native, the young foliage, tender young pods and fresh
inflorescences are eaten either raw or steamed, while the beans are cooked."