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Hollow-Stemmed JoePye Weed

Eutrochium fistulosum (Barratt) E.E. Lamont

(formerly Eupatorium fistulosum Barratt)

Asteraceae (Sunflower Family)


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Eutrochium fistulosum (Barratt) E.E. Lamont., Hollow-Stemmed Joe-Pye Weed (formerly Eupatorium fistulosum Barratt.):  (Bayer Code:  EUPFI; US Code EUFI14)

·         U.S.  native simple perennial with hollow, purple (or green with purple spots) generally hairless stems that can grow 2-7 feet tall; stem branching can be from base, but more in upper ½ to 1/3 of stem

·         Leaves are in whorls of 4-6 at nodes, lanceolate, with toothed margins

·         Head inflorescences are born in large panicles at tips of stems (panicles can be up to 18 inches tall and 12 inches wide)

·         Individual flower heads are about 0.25 inch diameter, with 5-7 pink , dusty-pink to purplish disk flowers (no ray flowers)

·         Bracts below inflorescence are in multiple layers, oval, green at base to pink at tips; tips are round-pointed

·         Flowering time is from mid-summer to early fall

·         Prefers moist, fertile soils in meadows, pastures, prairies, along ditches, marshes, streambanks; is also widely-planted as a rain-garden, wetland prairie plant, or as an ornamental in landscapes, wildflower areas

·         May be toxic if overgrazed, but a favorite of butterflies

·         Similar species include:

    o   Sweet Joe-Pye Weed (Eutrochium purpureum) has mostly solid stems, but flowers are more lilac, pink or whitish, and flower heads have 4-6 disk flowers

    o   Spotted Joe-Pye Weed (Eutrochium maculatum) has mostly solid stems, but flowers heads are more flattened, leaves a lighter green and flower heads have 8-20 disk flowers


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