Sphenophyte plants flourished during the Carboniferous.
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Two senses: (1) describing a leaf shape that tapers toward the base like a wedge; (2) in paleobotany/horsetail systematics, the 楔叶纲 / 楔叶目 are Sphenopsida — Carboniferous relatives of today's 木贼 (Equisetum).
