A new variety of Montia parvifolia (Montiaceae) in the high Idaho Batholith of central Idaho and adjacent Montana

  • Barbara Ertter Natural History Collections and Programs, The College of Idaho and University and Jepson Herbaria, University of California
  • Carol Prentice Harold M. Tucker Herbarium, The College of Idaho
  • Donald H. Mansfield Department of Biology and Harold M. Tucker Herbarium, The College of Idaho
  • Joshua Kabins Department of Biology, The College of Idaho
  • Grahm M. Johnson Department of Biological Sciences, University of Idaho


Montia parvifolia (Moc. ex DC.) Greene var. batholithica Ertter & C.A.M. Prent. (Montiaceae) is described as a new variety from high elevations (2100–2800 m) in central Idaho and adjacent Montana, based on an overview of variation within the species using a combination of standard taxonomic analysis of herbarium specimens, morphometric analysis, fieldwork, and common garden studies. Taxonomic history of the species is summarized, morphology and life history are clarified, and variation elsewhere in the species is also briefly addressed.


Bingham, R.T. 1987. Plants of the Seven Devils Mountains of Idaho–an annotated checklist. USDA Forest Service Intermountain Research Station General Technical Report INT-219.
Chambers, K.L. 1993. Montia. In: J.C Hickman, ed. The Jepson manual: higher plants of California. University of California Press, Berkeley, U.S.A. P. 904.
Davis, R.J. 1966. The North American perennial species of Claytonia. Brittonia 18:285–303.
Ertter, B. & B. Moseley. 1993 [1992]. Floristic regions of Idaho. J. Idaho Acad. Sci. 28(2):57–70.
Ferris, R.S. 1944. Portulacaceae. In: L. Abrams. Illustrated flora of the Pacific States. Vol. II. Polygonaceae to Krameriaceae.
Stanford University Press, Stanford, California, U.S.A. Pp. 119–135.
Graae, B.J. (+18 others). 2018. Stay or go — how topographic complexity influences alpine plant population and community responses to climate change. Perspect. Plant Ecol. 30:41–50.
Hanna, P. 1978. Bighorn sheep surveys and inventories. Study IV. Job 2: Reintroduction of bighorn sheep. Idaho Dept. of Fish & Game, Project W-170-R-2.
Heller, A.A. 1908. The genus Naiocrene. Muhlenbergia 3:146–147.
Henderson, L.F. 1930. Some new species and varieties from Oregon. Rhodora 32:20–28.
Hershkovitz, M.A. 2019. Systematics, evolution, and phylogeography of Montiaceae (Portulacineae). Phytoneuron 2019-27:1–77.
Hitchcock, C.L., A. Cronquist, M. Ownbey, & J.W. Thompson. 1964. Vascular plants of the Pacific Northwest. Part 2: Salicaceae to Saxifragaceae. Univ. Washington Publ. Biology 17:1–597.
Holm, T. 1905. Claytonia Gronov. A morphological and anatomical study. Mem. Natl. Acad. Sci. 10(2nd Memoir):27–37 +2 plates.
Holmgren, A.H. 1955. Portulacaceae of Nevada. Contr. Fl. Nevada 36:1–18.
Holmgren, N.H. & A.H. Holmgren. 2012. Montiaceae, the Montia family. In: N.H. Holmgren, P.K. Holmgren, J.L. Reveal, & collaborators. Vascular plants of the Intermountain West, Vol. 2, Part A. New York Botanical Garden, Bronx, U.S.A. Pp. 606–632.
Hultén, E. 1968. Flora of Alaska and neighboring territories. Stanford University Press, Stanford, California, U.S.A.
Jepson, W.L. 1914. A flora of California, Vol. I, part 5. Associated Students Store, University of California, Berkeley, U.S.A.
Johnson, G.M. 2019. Floristics and Biogeography of the High Idaho Batholith Ecoregion. MS Thesis, University of Idaho, ProQuest Dissertations Publishing, 10979883.
Legler, B.S. 2018. Montiaceae. In: C.L. Hitchcock & A. Cronquist, ed. by D.E. Giblin, B.S. Legler, P.F. Zika, & R.G. Olmstead. Flora of the Pacific Northwest, 2nd edition. University of Washington Press, Seattle, Washington, U.S.A. Pp. 372–377.
McGrath, C.L., A.J. Woods, J.M. Omernik, S.A. Bryce, M. Edmondson, J.A. Nesser, J. Shelden, R.C. Crawford , J.A. Comstock , & M.D. Plocher. 2002. Ecoregions of Idaho (color poster with map, descriptive text, summary tables, and photographs). Reston, Virginia, U.S. Geological Survey (map scale 1:1,350,000). https://www.epa.gov/eco-research/ecoregion-download-files-state-region-10
Miller, J.M. 2003a. Claytonia. In: Flora of North America Editorial Committee, eds. Flora of North America north of Mexico. Oxford University Press, New York, U.S.A., and Oxford, U.K. 4:465–475.
Miller, J.M. 2003b. Montia. In: Flora of North America Editorial Committee, eds. Flora of North America north of Mexico. Oxford University Press, New York, U.S.A., and Oxford, U.K. 4:485–488.
Miller, J.M. & K.L. Chambers. 2006. Systematics of Claytonia (Portulaceae). Syst. Bot. Monogr. 78:1–236.
Miller, J.M. & K.L. Chambers. 2012. Montia. In: B.G. Baldwin, D.H. Goldman, D.J. Keil, R. Patterson, T.J. Rosatti, & D.H. Wilken, eds. The Jepson manual: Vascular plants of California, 2nd edition. University of California Press, Berkeley. Pp. 908–910.
Nilsson, Ö. 1967. Studies in Montia L. and Claytonia L. and allied genera. Grana Palynol. 7:2–3, 279–363.
O’Quinn, R. & L. Hufford. 2005. Molecular systematics of Montieae (Portulacaceae): Implications for taxonomy, biogeography and ecology. Syst. Bot. 30:314–331.
O’Quinn, R. & L. Hufford. 2006. Shoot morphology in the Claytonia sibirica complex (Portulacaceae). Madroño 53:1–10.
Peck, M.E. 1941. A manual of the higher plants of Oregon. Binfords & Mort, Portland, Oregon, U.S.A.
Peck, M.E. 1961. A manual of the higher plants of Oregon, 2nd edition. Binfords & Mort, Portland, Oregon, U.S.A.
Richmond, G.M. 1986. Stratigraphy and correlation of glacial deposits of the Rocky Mountains, the Colorado Plateau and the ranges of the Great Basin. Quat. Sci. Rev. 5:99–127.
Rydberg, P.A. 1906. Studies on the Rocky Mountain flora. Bull. Torrey Bot. Club 33:137–161.
Rydberg, P.A. 1932. Portulacaceae. N. Amer. Fl. 21(4):276–336.
Swanson, J.R. 1966. A synopsis of relationships in Montioideae (Portulacaceae). Brittonia 18:229–241.
Tidestrom, I. 1925. Flora of Utah and Nevada. Contr. U.S. Natl. Herb. 25:1–665.
Torrey, J. & A. Gray. 1838. A flora of North America, Vol. 1, part 2. Wiley and Putnam, New York, U.S.A.
Welsh, S.L. 1974. Anderson’s flora of Alaska and adjacent parts of Canada. Brigham Young University Press, Provo, Utah, U.S.A.
Welsh, S.L., N.D. Atwood, S. Goodrich, & L.C. Higgins. 1987. A Utah flora. Great Basin Naturalist Mem. 9:1–894.
How to Cite
Ertter, B., Prentice, C., Mansfield, D. H., Kabins, J., & Johnson, G. M. (2021). A new variety of Montia parvifolia (Montiaceae) in the high Idaho Batholith of central Idaho and adjacent Montana. Journal of the Botanical Research Institute of Texas, 15(1), 5-22. https://doi.org/10.17348/jbrit.v15.i1.1048