Sphinctospermum

Sphinctospermum is a genus of flowering plants in the legume family, Fabaceae. It belongs to the subfamily Faboideae. It is a monotypic genus, containing the single species Sphinctospermum constrictum. It is native to North America, where it occurs in western and central Mexico and in Arizona in the southwestern United States.^[2][1][3] The plant is known by the common name hourglass peaseed.^[4]

Sphinctospermum
Conservation status
Apparently Secure  (NatureServe)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fabales
Family:	Fabaceae
Subfamily:	Faboideae
Tribe:	Robinieae
Genus:	Sphinctospermum Rose
Species:	S. constrictum
Binomial name
Sphinctospermum constrictum (S.Watson) Rose
Synonyms[2]
Cracca constricta (S.Watson) Tidestr. Tephrosia constricta S.Watson

This species occurs in grasslands and dry forests. It grows in sandy soils and is more common in wet years.^[1]