Botanical name: Myriophyllum tuberculatum    Family: Haloragaceae (Watermilfoil family)
Synonyms: Myriophyllum spathulatum

Red Watermilfoil is submerged water plant. Stem is much branched, up to 150 cm. Submerged leaves are 4- or 5-whorled, pectinate, ovate in outline, 2.5-4.0 × 1.0-1.5 cm; segments in 8-25 pairs, thread-like, 1-2 cm; emergent, uppermost leaves alternate, spoon-shaped to linear, 5-20 mm, margin shortly lobed to entire. Inflorescence of in leaf-axils flowers on emergent part of stem; bracts and bracteoles inprominent, ovate, margin entire. Flowers are 4-merous. Sepals ovate, about 0.5 mm, margin finely sawtoothed to entire. Petals are white, broadly spoon-shaped, 0.5-1.5 mm, persistent in fruit. Fruit is 4-loculed, 4-angled, 2-3.5 mm; mericarps below pointed, spinose-verrucose, tips not spreading. Flowering: May-September. Red Watermilfoil is found in India, Malaysia; Australia.

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The flower labeled Red Watermilfoil is ...