References

For Psilactis

Hartman, R.L., and M.A. Lane. 1987. A new species of Machaeranthera section Psilactis (Asteraceae: Astereae) from coastal Texas. Brittonia 39(2): 253-257. Google Scholar

Morgan, D.R. 2006. Psilactis. In Flora of North America Editorial Committee. 2006b. Flora of North America north of Mexico. Volume 20, Magnoliophyta: Asteridae, part 6: Asteraceae, part 2. Oxford Univ. Press, New York, NY. 666 pp. Google Scholar