紫穗槐属(英文: Amorpha)是豆目的其中一个属。这个属性的植物种类都源自于北美洲的国家，像加拿大南部、美国、和墨西哥北部。

此属的植物通常都为矮树丛，高度大概在三至五公尺。也有经由人工移植到欧洲生长。虽然在美国和加拿大的大部分地区都有生长，但是在美国的西维吉尼亚州和加拿大的曼尼托巴和安大略省，此属的植物被列为侵入种。

Amorpha is a genus of plants in the pea family, Fabaceae. All the species are native to North America, from southern Canada, most of the United States, and northern Mexico. They are commonly known as false indigo. The name Amorpha means "deformed" or "without form" in Greek and was given because flowers of this genus only have one petal, unlike the usual "pea-shaped" flowers of the Faboideae subfamily. Amorpha is missing the wing and keel petals.