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 (1906)
Species:	S. constrictum
Binomial name
Sphinctospermum constrictum (S.Watson) Rose (1906)
Synonyms[2]
Cracca constricta (S.Watson) Tidestr. (1935) Tephrosia constricta S.Watson (1889)

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]

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

References

External links

• Sphictospermum. The Plant List.

Further reading

Lavin, M. 1990. The genus Sphinctospermum (Leguminosae): Taxonomy and tribal relationships as inferred from a cladistic analysis of traditional data. Systematic Botany Vol. 15, No. 4 pp. 544–559

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