Field Horsetail (Equisetum arvense)
- Family: Horsetail (Equisetaceae)
- Spores: May
- Field Marks: This Equisetum has many slender stems arising from the main stem in whorls.
- Habitat: Along streams, wet ground; common in railroad ballast.
- Habit: Annual herb.
- Stems: Of 2 kinds: the cone-bearing stem unbranched, brownish to 10 inches tall; the sterile stems up to 2 feet tall, green, with whorls of slender branches.
- Leaves: Reduced to whorls of slender teeth at each joint on the stem.
- Cones: Borne at the tips of unbranched stems, narrowly ovoid, up to 1 inch long.
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