This very primitive plant forms dense evergreen colonies with an interesting texture, 1/4" wide stiff unbranched stems are upright & completely leafless, 'flowers' from late April to September are actually sporophylls at the top of stems that appear swollen & somewhat dark, spreads very easily (!) by creeping rhizomes. Historically used for scouring floors & other items (older names include Gun-Bright & Pewter-Wort).
Plant Hardiness Zones: 3a-11
Other names: Rough Horsetail
Native Range: Newfoundland to s. AL, south to FL, TX & CA. Rare in RI
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