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Dogfennel, Hogweed
Eupatorium capillifolium (Lam.) Small
Asteraceae (Sunflower Family)
▲ young plants
▲▼ young, mature plants (before flowering)
▲ older, mature plant
▲ ▼ stems and leaves
▲ leaf
Eupatorium capillifolium
(Lam.)
Small, Dogfennel, Tall Fennel, Sneezeweed:
(Bayer Code:
EUPCP; US Code EUCA5)
·
North American native herbaceous, simple perennial weed, with
semi-woody, reddish-purple main stem that branches much in upper 2/3 of
plant; can grow 2-6 feet tall; branches all angled strongly upright
·
Leaves are 2-3 times pinnately lobed into many thread-like segments
and are closely spaced along the stem; leaves have a bad odor if crushed or
bruised due to many glandular hairs on leaves
·
Flower head inflorescences are tiny (about 1/8 inch diameter), with
green to white disk flowers (no ray flowers) and are born in large branched
panicles at tips of stems
·
Bracts below inflorescences in multiple rows, green, oval with
transparent margins and pointed at tip
·
Flowering is from late summer through mid-autumn
·
Can be toxic to horses and other gazing animals; may cause skin rash
to animals or sensitive people that come in contact with it
EUPATORIUM:
·
Eupatorium is a genus of plants that includes weeds called Boneset,
Dogfennel, Eupatorium, Joe-Pyeweed, Thoroughwort, (all of the white-flowered
species are also called whitetop.
·
They are a group of perennial, native weeds that usually are not palatable
to livestock, and some are poisonous
·
Besides the weedy species described, there are several ornamental native
species/wildflowers that were previously included in this genus group (now
placed in the genus, Eutrochium), that are found in moist soils and have
large terminal clusters of white, pink or blue flowers; some have whorled
leaves—Sweet JoePye
Weed,
Spotted JoePye Weed,
Hollow-Stemmed JoePye Weed