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3b. Najas guadalupensis subsp. olivacea (Rosendahl & Butters) R. R. Haynes & Hellquist, Novon. 6: 371. 1996.
Najas olivacea Rosendahl & Butters, Rhodora 37: 347. 1935
Stems 15--40 cm ´ 1--2 mm. Leaves 0.9--1.8 cm; sheath 2.5--3.4 mm wide, apex rounded to truncate; blade 1.5--2 mm wide, teeth 20--40 per side, invisible to unaided eye, apex acute. Flowers 1 per axil. Staminate flowers 2.3--2.8 mm; anther 4-loculed. Pistillate flowers 2.7--3.1 mm. Seeds 2.3--2.5 ´ 0.6--0.8 mm; aeroleareoles of testa in 20--40 longitudinal rows. Chromosome number unknown not available.
Flowering late summer. Lakes and rivers; 0--100 m; Man., Ont.; Que.; Ind., Iowa, Mass., Mass., Mich., Minn., N.Y., Wis.
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