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.