Northern Prairie Wildlife Research Center
Purplestem Joepyeweed (Eupatoriadelphus fistulosus)
- Family: Aster (Asteraceae)
- Flowering: July-October.
- Field Marks: Joepyeweeds are coarse perennials with whorled leaves. This one differs from all the rest by having hollow, purple stems.
- Habitat: Wet meadows, along streams.
- Habit: Coarse perennial with fibrous roots.
- Stems: Erect, sometimes branched, glaucous, smooth, usually purplish, hollow, up to 8 feet tall.
- Leaves: Whorled, simple, lanceolate, pointed at the tip, tapering to the base, toothed, hairy or smooth, up to 9 inches long, up to 3 inches broad.
- Flowers: Several crowded in small heads arranged in a large round-topped cluster, each head up to 1/2 inch across and subtended by a few small, ovate bracts, all flowers tubular.
- Sepals: 0.
- Petals: 5, united to form a tube, pink-purple, 1/6-1/4 inch long.
- Stamens: 5.
- Pistils: Ovary inferior.
- Fruits: Achenes 1/6-1/4 inch long.
- Notes: This species traditionally has been placed in the genus Eupatorium.
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