Muskweed

Annual herb, 15–100 cm tall, erect, glabrous and glaucous.
Basal leaves oblanceolate, sagittate, pinnatifid to sinuate-dentate, petiolate; cauline leaves oblong-lanceolate, stem clasping, denticulate to entire, sessile.
Inflorescence an elongating raceme. Sepals 3 mm long, erect, the lateral ones slightly saccate. Petals 3–5 mm long, yellow. Stamens 6. Style short.
Fruit club-shaped, 6–8 mm long, 5 mm wide, slightly compressed