YELLOW NUTSEDGE, Cyperus
esculentus L. 1, whole plant; 2, seed. Perennial,
reproducing by seed and by tubers produced at the tips of scaly rhizomes.
Root system fibrous. Stems erect, triangular, yellow green.
Leaves 3-ranked, narrow, grasslike, basal. Flowers yellowish
or yellowish-brown, small, arranged in narrow spikelets on umbel-like inflorescence.
Seeds yellowish-brown, 3-angled, small, about 1/16 inch (1.5 mm)
long, with blunt ends. Found primarily on low, damp soils. Often troublesome
in cultivated fields and pastures, especially on low land. Usually considered
a serious weed.