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Penstemon humilis Nutt. ex A. Gray var. humilis Search in IPNISearch in Australian Plant Name IndexSearch in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical GardenAfrican Plants, Senckenberg Photo GallerySearch in Flora do Brasil 2020Search in Reflora - Virtual HerbariumSearch in Living Collections Decrease font Increase font Restore font
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  • Reference article Cronquist, A. J., A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren. 1984. Vascular Plants of the Intermountain West, U.S.A. 4: 1–573. In A. J. Cronquist, A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren (eds.) Intermount. Fl.. Hafner Pub. Co., New York.
  • Reference article Flora of North America Editorial Committee. 2019. Magnoliophyta: Tetrachondraceae to Orobanchaceae. 17: i–xxiv, 1–737. In Fl. N. Amer.. Oxford University Press, New York.
  • Reference article Hickman, J. C. 1993. The Jepson Manual: Higher Plants of California 1–1400. University of California Press, Berkeley.
 
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