Myriophyllum glomeratum

Annual marsh herb; stems more or less erect, 3–10 cm tall, mostly c. 0.5 mm diam., rooting only at the base. Leaves alternate, dimorphic; submerged leaves thin, linear, rarely trifid, 5–6 mm long; emergent leaves thick and fleshy, linear, curved, c. 2.5 mm long. Bracteoles linear to narrow-triangular, c. 0.3 mm long, white; flowers 2 or 3 per axil. Male flowers sessile or shortly pedicellate; sepals absent; petals 4, 0.8–1.1 mm long, reddish; stamens 4. Female flowers sessile; sepals and petals absent; ovary 4-celled, styles clavate, becoming reflexed, stigmas white. Fruit cylindric to urceolate, golden or reddish-brown; mericarps cylindric, 0.8–1.2 mm long, swollen and slightly wrinkled at base, smooth and tapering above, with an oblique collar. Flowers Sep.–Jan.