Conyza Canadensis (L.) Cronq.
Common Name : Canadian horseweed
Family : Asteraceae
HABIT |
AN ANNUAL HERB, UP TO 1 M HIGH. |
STEMS |
STOUT CENTRAL STEM
UNBRANCHED, RIDGED AND COVERED WITH LONG WHITE HAIRS. |
LEAVES |
ALTERNATE AROUND THE STEM, (APPEARING ALMOST WHORLED) DIFFER
LITTLE IN LENGTH EXCEPT BENEATH THE INFLORESCENCE, CREATING A COLUMNAR
EFFECT. LEAVES NARROWLY LANCEOLATE OR OBLANCEOLATE, WITH A FEW TEETH TOWARDS
THE OUTER TIP, AND FINE WHITE HAIRS ALONG THE MARGINS. |
FLOWERS |
SEVERAL FLOWERING STEMS
APPEAR AT THE APEX, WHICH BRANCHES FREQUENTLY AND SPREAD UPWARD AND OUTWARD,
TERMINATING IN A MULTITUDE OF TINY COMPOSITE FLOWERS. DISC FLORETS YELLOW AND
RAY FLORETS WHITE |
FRUITS |
ACHENES ARE LIGHT BROWN AND
HAVE TUFT OF WHITE OR LIGHT BROWN HAIRS. |