Equisetum

Meikle, R.D. 1985: Flora of Cyprus 2

but modified

1	Sterile stems whitish (brown towards base), smooth, with (14-)20-40 branches at nodes, hollow for at least 2/3 diam.; strobilus 4.5-7 cm long Equisetum telmateia
1'	Sterile stems greenish, minutely tuberculate, with 0-6 branches at nodes, hollow for up to 2/3 diam.; strobilus 0.4-2 cm long Equisetum ramosissimum