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Published In: Flora Sedinensis 382. 1824. (Fl. Sedin.) Name publication detail
 

Project Name Data (Last Modified On 7/9/2009)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native

 

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1. Najas flexilis (Willd.) Rostk. & F.W. Schmidt (northern naiad)

Pl. 110 g, h; Map 450

Stems 20–50 cm long. Leaves 1–3 cm long, 0.2–0.6 mm wide, ascending to spreading, minutely serrulate with 1‑celled teeth usually visible only with magnification, the tip acute to acuminate. Leaf bases gradually broadened into stipular sheaths, the sheaths not auriculate. Seeds 2.5–3.7 mm long, elliptic to narrowly obovate, not curved at the tip, the surface yellow to reddish brown, shiny, finely and indistinctly pitted with 30–50 rows of 4–6‑sided pits. 2n=12, 24. July–September.

Uncommon, known only from historical collections from Boone County (U.S. and Canada, south to Utah and Maryland). Submerged aquatic in lakes.

This species is apparently sensitive to changes in water quality (Wentz and Stuckey, 1971) and has disappeared from a number of sites within its range, including the Missouri populations, as waters have become polluted.

 
 


 

 
 
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