HABIT	AN ERECT, SIMPLE OR MUCH- BRANCHED ANNUAL OR PERENNIAL HERB, 60-90 CM TALL.
STEMS	GLABROUS OR MORE OR LESS PUBESCENT, QUADRANGULAR, GROOVED; BRANCHES OPPOSITE.
LEAVES	VERY VARIABLE, SOMETIMES TRIFOLIATE, BUT USUALLY CONSISTING OF 2 SUB OPPOSITE PAIRS OF LEAFLETS AND A LARGER, DEEPLY 3-LOBED, TERMINAL LEAFLETS.
FLOWERS	THE INFLORESCENCE IS AN ISOLATED OR GROUPED PEDUNCULATED CAPITULA, EMERGING FROM THE LEAF AXIL. HEADS BORNE SINGLY AT THE ENDS OF LONG, SLENDER, NEARLY LEAFLESS BRANCHES; NARROW, DISCOID, THE DISK 4-6 MM WIDE AT ANTHESIS; RAY FLORETS WHITE OR PALE-YELLOW AND DISK FLORETS YELLOW.
FRUITS	ACHENES 0.8-1.7 CM LONG, LINEAR, QUADRANGULAR, SLIGHTLY TAPERING TOWARDS THE APEX, BLACK, GLABROUS, BEARING A FEW PALE STIFF HAIRS ON THE ANGLES IN THE UPPER PART; PAPPUS BRISTLES 2-4, STRAW-COLOURED, 2-3 MM LONG.