''Sphinctospermum'' is a genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. They include all forbs (flowering plants without a woody stem), grasses and grass-like plants, a vast majority of ...

s in the

legume A legume () is a plant in the family Fabaceae (or Leguminosae), or the fruit or seed of such a plant. When used as a dry grain, the seed is also called a pulse. Legumes are grown agriculturally, primarily for human consumption, for livestock fo ...

family, Fabaceae. It belongs to the subfamily

Faboideae The Faboideae are a subfamily of the flowering plant family Fabaceae or Leguminosae. An acceptable alternative name for the subfamily is Papilionoideae, or Papilionaceae when this group of plants is treated as a family. This subfamily is widely ...

. It is a monotypic genus, containing the single species ''Sphinctospermum constrictum''. It is native to North America, where it occurs in Mexico and Arizona in the southwestern United States.''Sphinctospermum constrictum''.
NatureServe Explorer.Lavin M. & J. J. Doyle. 1991
Tribal relationships of ''Sphinctospermum'' (Leguminosae): Integration of traditional and chloroplast DNA data.
''Systematic Botany'' Vol. 16, No. 1 pp. 162-172. The plant is known by the common name hourglass peaseed.''Sphinctospermum constrictum''.
USDA NRCS Plants Database. This species occurs in grasslands and dry forests. It grows in sandy soils and is more common in wet years.

References

External links

''Sphictospermum''.
The Plant List.

References

External links

Further reading