Schkuhria is a small but taxonomically complex genus, native in South- and Central America and the southern United States. Many species have been described but most are currently included in the variable Schkuhria pinnata.
Heiser C.B. (1945) A revision of the genus Schkuhria. Ann. Missouri Bot. Gard. 32: 265-278.
Strother J.L. (2006) Schkuhria. In: Flora of North America Editorial Committee (eds.), Flora of North America, vol. 21. Oxford University Press, New York-Oxford: 380-381.