Gary Fewless
Key to Equisetum
| 9. Sheaths about as long as wide and with black
bands at base and tip of each sheath; stems rough, perennial and often
persisting for several years. |
Equisetum hyemale |
| 9. Sheaths longer than wide and at most with
a black band at base of some sheaths; stems smooth, annual and not persisting
over winter. |
Equisetum laevigatum |
| Return to start of fern key |