🗝 Flora of the Southern and Mid-Atlantic States: http://www.herbarium.unc.edu/FloraArchives/WeakleyFlora_2015-05-21.pdf
🗝 A REVISION OF PHYLLANTHUS (EUPHORBIACEAE) IN THE CONTINENTAL UNITED STATES, by GRADY L. WEBSTER: https://herbarium.ucdavis.edu/publications/webster/40.Brittonia%20Vol.%2022%201970.pdf
🗝 Equisetum Species: These keys all require the vegetative stalks in addition to the reproductive ones.
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