yellow nutsedge
Cyperus esculentus                                         

Identifying Characteristics:

Seed:  triangular to rectangular bulbs; medium brown with network of veins over surface

Seedling:  mostly basal leaves with prominent midvein; triangular stem; glossy leaf surface

Mature Plant: erect growth habit; umbel inflorescence with many spikes; yellow colored

Method of Propagation: rhizomes, basal bulbs, tubers

Life Cycle: warm-season perennial

References:  Bryson, Charles T. & Michael S DeFelice. "Weeds of the Midwestern United States & Central Canada."