Gary Fewless

Key to Equisetum

6. Stems essentially solid inside, lacking conspicuous central cavity; stems small (less than 1.5 mm thick and often less than 15 cm long), conspicuously curved and often numerous and tangled.	Equisetum scirpoides
6. Stems with conspicuous central cavity of at least 1/4 the diameter of the stem; stems about 2 mm or more thick, usually longer than 10 cm, and essentially straight.	7

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