Myriophyllum pinnatum (Walter) Britton, Sterns & Poggenb.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Haloragaceae
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Scientific Name
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Description
Species Description - Lvs partly or largely alternate or scattered, 1–3 cm, with capillary segments; emersed lvs sometimes developing and resembling the bracts, these chiefly whorled, much exceeding the fls, to 18 mm, with a flat rachis to 1 mm wide and on each side 3–5 ascending teeth 1–2 mm; spikes emersed; fr 2 mm, deeply lobed, each mericarp bearing a flat or concave longitudinal ridge with sharply tuberculate margins. Mass. to O., Io., and S.D., s. to Ga. and Tex., more abundant southward. (M. scabratum)