For Herniaria
Thieret, J.W., R.L. Hartman, and R.K. Rabeler. 2005. Herniaria. In Flora of North America Editorial Committee. 2005. Flora of North America north of Mexico. Volume 5, Magnoliophyta: Caryophyllidae, part 2. Oxford Univ. Press, New York, NY. 656 pp.
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