Gary Fewless
Key to Equisetum
| 4. Lowest
internode of lowest branches shorter than the adjacent stem sheath;
branches 4-6 ridged; fertile plants with strobilus on tip of green, branched
stems; plants of swamps or marshes. |
Equisetum palustre |
| 4. Lowest internode of lowest branches longer than the adjacent stem sheath; branches 3-4 ridged; fertile plants various. | 5 |
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