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Eupatorium compositifolium
Walter
Family:
Asteraceae
Yankeeweed
leehoffman17
FNA
Resources
Kunsiri Chaw Siripun, Edward E. Schilling in Flora of North America (vol. 21)
Perennials,
50-200 cm.
Stems
(from short caudices) single, branched distally, puberulent throughout (lateral buds often develop fertile and infertile branches).
Leaves
opposite (proximal) or alternate (lateral buds dormant or producing 1 pair of leaves); sessile; blades (often pinnately or ternately lobed) or lobes pinnately nerved, linear, 20-80 × 0.5-2.5(-4) mm, bases cuneate, margins entire, apices acuminate, faces puberulent, gland-dotted.
Heads
in paniculiform arrays.
Phyllaries
7-10 in 2-3 series, (sometimes purple) elliptic to oblong, 1-3 × 0.5-0.8 mm, (margins hyaline) apices acuminate and mucronate, abaxial faces puberulent (mostly on midveins), usually gland-dotted.
Florets
5; corollas (sometimes with purple throats) 2.5-3 mm.
Cypselae
1-1.7 mm;
pappi
of 20-30 bristles 3-3.5 mm.
2
n
= 20. Flowering Aug-Oct. Open or slightly shaded, wet sites, sand dunes, disturbed areas, roadsides, flatwoods; 10-200+ m; Ala., Ark., Fla., Ga., Ky., La., Miss., N.C., Okla., S.C., Tenn., Tex., Va.
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