Isoetes echinospora

Rarity: Common

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What Wikipedia says

Isoetes echinospora is a species of lycophyte in the family Isoetaceae. It is sometimes referred to by the common names spiny quillwort, spiny-spored quillwort or spring quillwort

Excerpt from the Wikipedia article “Isoetes echinospora”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: W. Carl Taylor. USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento. Courtesy of USDA NRCS Wetland Science Institute., Public domain, via Wikimedia Commons.