Eupatoriadelphus fistulosus (Barratt) R.M. King & H. Rob.
Eutrochium fistulosum (Barratt) E.E. Lamont
Hollow Joe-Pye weed, trumpetweed, purple thoroughwort
Hollow Joe-Pye weed is native to eastern North America. It is very popular with butterflies.
Plants: These perennials have a rather stately presence, reaching up to 12′ (3.6 m) in height, often forming large groups. A single, smooth, hollow stem has purple dots or vertically oriented purple lines, becoming reddish or purple near the top.
Leaves: Lanceolate, dark green, in precise whorls of 3 to 5, with sharp teeth. Leaves are 3–11″ (8–28 cm) long.
Flowers: Plants produce an array of several flowerheads. Each flowerhead has 4-7 pink-purple disc flowers about ¼″ (8.4 mm) long, but no ray flowers. Flowers appear from July to September. They may have a mild fragrance.
Fruits: Bullet-shaped achenes are ⅛″ (3 mm) long, tipped with tufts of hairs.
Habitats: Rich moist soils, such as floodplains and marshes, in forests and fields, in full to partial sun.
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Similar species. |
Online References:
Eupatorium fistulosum Barratt
Eupatoriadelphus fistulosus (Barratt) R.M. King & H. Rob.
Eupatoriadelphus fistulosus (Barratt) R.M. King & H. Rob.
8/20/2025 · Peaks Island, Maine 
7/25/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 6 × 3½″ (14 × 9.6 cm) 
8/20/2025 · Peaks Island, Maine 
7/25/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 8 × 5″ (19 × 12 cm) 
10/25/2024 · River Point Conservation Area, Falmouth, Maine 
7/25/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 11 × 8″ (28 × 19 cm) 
6/13/2025 · River Point Conservation Area, Falmouth, Maine 
7/26/2025 · River Point Conservation Area, Falmouth, Maine 
10/25/2024 · River Point Conservation Area, Falmouth, Maine 
7/25/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 6 × 3½″ (15 × 9.7 cm) 
7/25/2025 · River Point Conservation Area, Falmouth, Maine 
7/25/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 6 × 3½″ (16 × 9.6 cm) 
7/25/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 8 × 6″ (21 × 14 cm) 
7/25/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 9 × 13″ (22 × 34 cm) 
7/25/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 5 × 8″ (12 × 19 cm) 
7/25/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 4 × 6″ (10 × 16 cm) 
10/25/2024 · River Point Conservation Area, Falmouth, Maine 
6/13/2025 · River Point Conservation Area, Falmouth, Maine 
7/26/2025 · River Point Conservation Area, Falmouth, Maine · ≈ 1 × 1½′ (32 × 44 cm) 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Magnoliopsida | Dicotyledons—plants with two initial seed leaves |
| Subclass | Asteridae | A large class that encompasses asters |
| Order | Asterales | Flowering plants with a central disk flower and surrounding petals, like daisies |
| Family | Asteraceae | The aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers |
| Genus | Eutrochium | From Greek eu, “well,” and troche, “wheel-like,” for the whorled leaves |
| Species | fistulosum | A reference to the tubular, hollow stem |
Eutrochium fistulosum description by Thomas H. Kent, not updated.
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