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Euphorbia aaron-rossii (Euphorbiaceae), a new species from Marble and Grand Canyons of the Colorado River, Arizona

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Abstract

The new species,Euphorbia aaron-rossii from along the Colorado River within the inner gorge of Marble Canyon and Grand Canyon, Coconino Co., Arizona, is described, mapped, and illustrated. Scanning electron micrographs of the seed coat are included. It clearly belongs to subgenusAgaloma sectionTithymalopsis, where it is most closely related toE. wrightii.

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Literature Cited

  • Correll, D. S. & M. C. Johnston. 1970. Manual of the vascular plants of Texas. Texas Research Foundation. Renner, TX.

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  • Huft, M. J. 1979. A monograph ofEuphorbia sectionTithymalopsis. Ph.D. dissertation. University of Michigan, Ann Arbor.

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  • Johnston, M. C. 1974.Euphorbia (subg.Agaloma) henricksonii, new species from the Chihuahuan Desert. Madroño 22: 373–375.

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  • Webster, G. L. 1967. The genera of Euphorbiaceae in the southeastern United States. J. Arnold Arbor. 48: 303–361, 363–430.

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Authors and Affiliations

  1. Department of Biology, Utah State University, 84322, Logan, UT

    Arthur H. Holmgren

  2. New York Botanical Garden, 10458-5126, Bronx, NY

    Noel H. Holmgren

Authors
  1. Arthur H. Holmgren
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  2. Noel H. Holmgren
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Holmgren, A.H., Holmgren, N.H. Euphorbia aaron-rossii (Euphorbiaceae), a new species from Marble and Grand Canyons of the Colorado River, Arizona. Brittonia 40, 357–362 (1988). https://doi.org/10.2307/2807646

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  • DOI: https://doi.org/10.2307/2807646

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