Ageratina altissima (L.) R.M. King & H. Rob. White snakeroot, tall boneset, white sanicle
White snakeroot is native to eastern North America. Plants: Up to 5' (1.5 m) high, growing as a single plant or a clump with multiple stems. Stems are light green, sometimes tan, round, with few or no hairs. Leaves: Near the base of the plant, leaves are are heart-shaped to oval (cordate to cordate-ovate). Leaves further up the stem are narrower and more lance-shaped (lanceolate). The leaves are 2½-6" (6.3-15 cm) × 1-3" (2.5-7.6 cm), with sharp, coarse serrations. Leaf undersides have prominent veins. Leaf stems are longer than most, from ½-2½" (1.3-6.3 cm) long. Flowers: White snakeroot blooms in rounded corymbs, each containing 10 to 25 white flowers about ⅛" (5 mm) around. Each flower is a composite flower, composed of a central disc and surrounding petals. Since each petal is technically a flower in its own right, you could say that white snakeroot contains flowers within flowers within flowers. Or petals and disc flowers within flowerets within inflorescences. Or just white fuzzy-looking flowers. Fruits: Tiny black bristled 5-angled achenes equipped with equally tiny parachutes. Edibility: Poisonous Online References:
Ageratina altissima at Illinois Wildflowers Ageratina altissima on Kansas Wildflowers and Grasses Ageratina altissima on Southeastern Flora, the Southeastern U.S. Plant Identification Resource Ageratina altissima at Minnesota Wildflowers Ageratina altissima on the Connecticut Botanical Society's Connecticut wildflowers site Ageratina altissima on Plants for a Future, a resource and information centre for edible and otherwise useful plants Ageratina altissima on www.pinecreekvalley.com Ageratina altissima on Discover Life 8/6/2010 · Nashua River Rail Trail, Groton, Massachusetts 8/15/2013 · Groton Place and Sabine Woods, Groton, Massachusetts 8/6/2010 · Nashua River Rail Trail, Groton, Massachusetts 9/7/2013 · Beech Hill, Dublin, New Hampshire 9/7/2013 · Beech Hill, Dublin, New Hampshire 8/15/2013 · Groton Place and Sabine Woods, Groton, Massachusetts 10/2/2010 · Hackers Trail, Cliff Park, Delaware Water Gap National Recreation Area, Pennsylvania
Ageratina altissima description by Thomas H. Kent, last updated 5 Oct 2021. © FloraFinder.org. All rights reserved. |
8/6/2010 · Nashua River Rail Trail, Groton, Massachusetts 8/6/2010 · Nashua River Rail Trail, Groton, Massachusetts 9/7/2013 · Beech Hill, Dublin, New Hampshire 8/15/2013 · Groton Place and Sabine Woods, Groton, Massachusetts 12/12/2020 · By Jacquelyn Boyt 8/15/2013 · Groton Place and Sabine Woods, Groton, Massachusetts 10/2/2010 · Hackers Trail, Cliff Park, Delaware Water Gap National Recreation Area, Pennsylvania 8/31/2021 · Pumpkinvine Nature Trail, Middlebury, Indiana · By Jeff Griffin 8/6/2010 · Nashua River Rail Trail, Groton, Massachusetts 10/2/2010 · Hackers Trail, Cliff Park, Delaware Water Gap National Recreation Area, Pennsylvania Range: Zones 4-8:
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