Potamogeton hillii Morong

• Authority

  Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

• Family

  Potamogetonaceae

• Scientific Name

  Potamogeton hillii Morong

• Description

  Species Description - Stems very slender, usually freely branched, to 1 m, with or more often without nodal glands; rhizome scarcely developed; lvs all submersed, narrowly linear, 3–7 cm × 1–2 mm, usually sharply acute or cuspidate, 3(5)-veined, the lateral veins very delicate, the midvein flanked by one or 2 rows of lacunar cells on each side; stipular sheaths axillary, free, white or light brown, 1–1.5 cm, becoming fibrous; winter-buds ± sharply differentiated; peduncles mostly axillary, 5–15 mm, clavate, commonly recurved; spike capitate, 4–7 mm, with 1(2) whorls of fls; body of the fr obovate, flattened, 2.5–4 mm, with a low, sharp dorsal keel and a pair of lateral keels, the beak ca 0.5 mm; 2n=26. Chiefly in clear, cold, calcareous waters; irregularly from Mass. and Vt. to Pa. and w. to Ont., O., and Mich. (P. porteri)

• Common Names

  Hill's pondweed