Everitt, J.H., D.L. Drawe, and R.I. Lonard. 1999. Field guide to the broad leaved herbaceous plants of South Texas used by livestock and wildlife. Texas Tech University Press, Lubbock.
More Accounts and Images: Plantagohookeriana Fisch. & C.A. Mey.
View taxonomic account from Integrated Taxonomic Information System (ITIS) for ITIS Taxonomic Serial Number 504436.
View species account from Lady Bird Johnson Wildflower Center Native Plant Information Network (NPIN).