Millettia lantsangensis Z.Wei was described within the tribe Millettieae on the basis of one fruiting and two flowering gatherings from Yunnan Province, China. Our critical examination shows that these gatherings are mixed and represent two distinct species from two different tribes. The fruiting specimens have woody branches, terminal infructescences and inflated pods, closely resembling Callerya sphaerosperma (Z. Wei) Z. Wei & Pedley from the same tribe, while the flowering collections have soft and herbaceous branches, axillary pseudoracemes and wart-like brachyblasts, and belong to Cruddasia insignis Prain from the tribe Phaseoleae. Because one of the flowering specimens was indicated as the type of Millettia lantsangensis, this is here reduced to a synonym of Cruddasia insignis. The genus Cruddasia Prain was previously reported only from Myanmar and Thailand, and is therefore a new genus record for the flora of China.