Tithymalus arkansanus var. coloradensis (Norton) Rydb.
First published in Bull. Torrey Bot. Club 33: 145 (1906)
Not accepted by
- Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew. [Cited as Euphorbia spathulata.]
Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
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