Cyperus iria L.
Common Name : Ricefield flatsedge
Family : Cyperaceae
HABIT |
AN ANNUAL SEDGE, SOMETIMES BEHAVING AS A PERENNIAL. 8 TO 60 CM
HIGH. |
STEMS |
THE CULMS ARE TUFTED,
TRIANGULAR, GLABROUS, GREEN AND 0.6-3.0 MM THICK. THE ROOTS ARE NUMEROUS,
SHORT AND YELLOWISH-RED. |
LEAVES |
LINEAR-LANCEOLATE, USUALLY ALL SHORTER THAN THE CULM, 1-8 MM
WIDE, FLAT, AND SCABRID ON THE MARGIN AND MAJOR RIBS; LEAF SHEATHS ARE GREEN
TO\ REDDISH-BROWN, MEMBRANEOUS AND ENVELOPE THE CULM AT THE BASE. |
FLOWERS |
INFLORESCENCE IS SIMPLE OR
COMPOUND, USUALLY OPEN, 1-20 CM LONG AND 1-20 CM WIDE, WITH GROUPS OF SPIKES
WHICH ARE EITHER SESSILE OR ON 0.5-15.0 CM LONG PEDUNCLES (RAYS). SPIKELETS
ARE ERECT-SPREADING, CROWDED, 6-24-FLOWERED, 2-13 MM LONG, 1.5-2.0 MM WIDE, GOLDEN
TO YELLOWISH-GREEN. |
FRUITS |
NUTLET, 1.0-1.5 MM
LONG, 0.6-0.7 MM WIDE, OBOVATE, TRIANGULAR IN CROSS SECTION, DARK-BROWN TO
ALMOST BLACK; THE SURFACE IS ALMOST SMOOTH. |