''Sphinctospermum'' is a genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

s in the

legume Legumes are plants in the pea family Fabaceae (or Leguminosae), or the fruit or seeds of such plants. When used as a dry grain for human consumption, the seeds are also called pulses. Legumes are grown agriculturally, primarily for human consum ...

family,

Fabaceae Fabaceae () or Leguminosae,International Code of Nomen ...

. 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 western and central Mexico and in Arizona in the southwestern United States. The plant is known by the common name hourglass peaseed. This species occurs in

grassland A grassland is an area where the vegetation is dominance (ecology), dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush (Juncaceae) can also be found along with variable proportions of legumes such as clover, and other Herbaceo ...

s 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