Keys to Nature
Project
Key to Eupatorium species


© Paul Rothrock - Keys to Nature Project

Title:
Key to Eupatorium species
Version:
60
Author(s):
Sean Boyle, Paul Rothrock
Email:
plrothrock@taylor.edu
Description:

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Key Structure:
1. Leaves whorled - 2
1. Leaves opposite - 4
2. Inflorescences +/- flat-topped; flowers 9 or more per head - E. maculatum
2. Inflorescences not flat-topped;flowers 4-8 per head - 3
3. Stems purplish throughout - E. fistulosum
3. Stems purplish only at nodes - E. purpureum
4. Flowers blue, pink, or purple - E. coelestinum
4. Flowers white - 5
5. Leaves petiolate - 6
5. Leaves sessile or perfoliate - 7
6. Leaves lanceolate (at least 4 times longer than wide) - E. serotinum
6. Leaves ovate (1.5-2.5 times longer than wide) - E. rugosum
7. Leaves perfoliate - E. perfoliatum
7. Leaves not perfoliate - 8
8. Leaves lanceolate with one main vein - E. sessilifolium
8. Leaves linear to lanceolate with three parallel veins - E. altissimum

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This page was last modified on: Tue, 28 Apr 2009 20:59:01 -0500.